deliverable/linux.git
8 years agomtd: nand: sunxi: poll for events instead of using interrupts
Boris Brezillon [Mon, 7 Mar 2016 14:34:39 +0000 (15:34 +0100)] 
mtd: nand: sunxi: poll for events instead of using interrupts

Some NAND operations are so fast that it doesn't make any sense to use
interrupt based waits (the scheduling overhead is not worth it).
Rename sunxi_nfc_wait_int() into sunxi_nfc_wait_events() and add a
parameter to specify whether polling should be used or not.

Note that all sunxi_nfc_wait_int() are moved to the polling approach now,
but this should change as soon as we have more information about the
approximate time we are about to wait (can be extracted from the NAND
timings, and the type of operation).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: make use of readl_poll_timeout()
Boris Brezillon [Mon, 7 Mar 2016 14:25:17 +0000 (15:25 +0100)] 
mtd: nand: sunxi: make use of readl_poll_timeout()

Replace open coded polling loops by readl_poll_timeout() calls.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: fix ->dev_ready() implementation
Boris Brezillon [Mon, 7 Mar 2016 14:10:28 +0000 (15:10 +0100)] 
mtd: nand: sunxi: fix ->dev_ready() implementation

->dev_ready() is not supposed to wait for busy to ready solution (this is
the role of ->waitfunc()).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: enable ECC pipelining
Boris Brezillon [Fri, 4 Mar 2016 16:33:10 +0000 (17:33 +0100)] 
mtd: nand: enable ECC pipelining

When the NAND controller operates in DMA mode it can pipeline ECC
operations which improves the throughput.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: disable clks on device removal
Boris Brezillon [Fri, 4 Mar 2016 17:26:40 +0000 (18:26 +0100)] 
mtd: nand: sunxi: disable clks on device removal

mod and ahb clocks are not disabled when the NAND controller device is
removed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: fix NFC_CTL setting
Boris Brezillon [Fri, 4 Mar 2016 16:29:20 +0000 (17:29 +0100)] 
mtd: nand: sunxi: fix NFC_CTL setting

NFC_PAGE_SHIFT() already takes the real page_shift value and subtract 10
to it.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: fix the NFC_ECC_ERR_CNT() macro
Boris Brezillon [Fri, 4 Mar 2016 16:25:08 +0000 (17:25 +0100)] 
mtd: nand: sunxi: fix the NFC_ECC_ERR_CNT() macro

NFC_ECC_ERR_CNT() is not taking into account the case when the NAND chip
contains more than 4 ECC blocks (NANDs with 4kB+ pages).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: let the NAND controller control the CE line
Boris Brezillon [Fri, 4 Mar 2016 16:21:35 +0000 (17:21 +0100)] 
mtd: nand: sunxi: let the NAND controller control the CE line

We don't need to manually toggle the CE line since the controller handles
it for us. Moreover, keeping the CE line low when interacting with a DDR
NAND can be problematic (data loss in some corner cases).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: improve ->cmd_ctrl() function
Boris Brezillon [Wed, 16 Sep 2015 07:05:31 +0000 (09:05 +0200)] 
mtd: nand: sunxi: improve ->cmd_ctrl() function

Try to pack address and command cycles into a single NAND controller
command to avoid polling the status register for each single change
on the NAND bus.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: implement ->read_subpage()
Boris Brezillon [Wed, 16 Sep 2015 07:01:45 +0000 (09:01 +0200)] 
mtd: nand: sunxi: implement ->read_subpage()

Being able to read subpages can greatly improve read performances if the
MTD user is only interested in a small section of a NAND page.
This is particularly true with large pages (>= 8k).

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: implement ->read_oob()/->write_oob()
Boris Brezillon [Wed, 2 Sep 2015 13:05:52 +0000 (15:05 +0200)] 
mtd: nand: sunxi: implement ->read_oob()/->write_oob()

Allwinner's ECC engine is capable of protecting a few bytes of the OOB
area. Implement specific OOB functions to benefit from this capability.

Also, when in raw mode, the randomizer is disabled, which means you'll
only be able to retrieve randomized data, which is not really useful
for most applications.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: export default read/write oob functions
Boris Brezillon [Wed, 26 Aug 2015 14:08:12 +0000 (16:08 +0200)] 
mtd: nand: export default read/write oob functions

Export the default read/write oob functions (for the standard and syndrome
scheme), so that drivers can use them for their raw implementation and
implement their own functions for the normal oob operation.

This is required if your ECC engine is capable of fixing some of the OOB
data. In this case you have to overload the ->read_oob() and ->write_oob(),
but if you don't specify the ->read/write_oob_raw() functions they are
assigned to the ->read/write_oob() implementation, which is not what you
want.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: adapt clk_rate to tWB, tADL, tWHR and tRHW timings
Boris Brezillon [Wed, 11 Nov 2015 21:30:30 +0000 (22:30 +0100)] 
mtd: nand: sunxi: adapt clk_rate to tWB, tADL, tWHR and tRHW timings

Adapt the NAND controller clk rate to the tWB, tADL, tWHR and tRHW
timings instead of returning an error when the maximum clk divisor is
not big enough to provide an appropriate timing.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: fix EDO mode selection
Boris Brezillon [Wed, 2 Dec 2015 14:57:20 +0000 (15:57 +0100)] 
mtd: nand: sunxi: fix EDO mode selection

The ONFI spec says that EDO should be enabled if the host drives tRC less
than 30ns, but the code just tests for the tRC_min value extracted from
the timings exposed by the NAND chip not the timings actually configured
in the NAND controller.
Fix that by first rounding down the requested clk_rate with
clk_round_rate() and then checking if tRC is actually smaller than 30ns.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: fix clk rate calculation
Boris Brezillon [Wed, 2 Dec 2015 14:10:40 +0000 (15:10 +0100)] 
mtd: nand: sunxi: fix clk rate calculation

Unlike what is specified in the Allwinner datasheets, the NAND clock rate
is not equal to 2/T but 1/T. Fix the clock rate selection accordingly.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: sunxi: fix call order in sunxi_nand_chip_init()
Boris Brezillon [Wed, 2 Dec 2015 15:00:57 +0000 (16:00 +0100)] 
mtd: nand: sunxi: fix call order in sunxi_nand_chip_init()

sunxi_nand_chip_set_timings() is extracting a pointer to the nfc from the
nand->controller field, but this field is initialized after
sunxi_nand_chip_set_timings() call.
Reorder the calls to avoid any problem.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: pxa3xx: rely on generic DT parsing done in nand_scan_ident()
Boris Brezillon [Fri, 1 Apr 2016 12:54:30 +0000 (14:54 +0200)] 
mtd: nand: pxa3xx: rely on generic DT parsing done in nand_scan_ident()

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
8 years agomtd: nand: atmel: rely on generic DT parsing done in nand_scan_ident()
Boris Brezillon [Fri, 1 Apr 2016 12:54:22 +0000 (14:54 +0200)] 
mtd: nand: atmel: rely on generic DT parsing done in nand_scan_ident()

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>
8 years agomtd: nand: pasemi: switch to dev_* printing functions
Rafał Miłecki [Wed, 13 Apr 2016 09:48:05 +0000 (11:48 +0200)] 
mtd: nand: pasemi: switch to dev_* printing functions

It also contains some minor related changes:
1) Don't warn if kzalloc fails as it dumps stack on its own
2) Use %pR format for displaying whole resource to avoid invalid format
   warning

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: socrates: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:51 +0000 (12:23 +0200)] 
mtd: nand: socrates: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: plat: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:50 +0000 (12:23 +0200)] 
mtd: nand: plat: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: pasemi: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:49 +0000 (12:23 +0200)] 
mtd: nand: pasemi: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: orion: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:48 +0000 (12:23 +0200)] 
mtd: nand: orion: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: nuc900: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:47 +0000 (12:23 +0200)] 
mtd: nand: nuc900: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: mxc: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:46 +0000 (12:23 +0200)] 
mtd: nand: mxc: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: gpio: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:45 +0000 (12:23 +0200)] 
mtd: nand: gpio: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: ams-delta: set ECC algorithm explicitly
Rafał Miłecki [Fri, 8 Apr 2016 10:23:44 +0000 (12:23 +0200)] 
mtd: nand: ams-delta: set ECC algorithm explicitly

This is part of process deprecating NAND_ECC_SOFT_BCH (and switching to
enum nand_ecc_algo).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: brcm: rely on generic DT parsing done in nand_scan_ident()
Boris Brezillon [Fri, 1 Apr 2016 12:54:24 +0000 (14:54 +0200)] 
mtd: nand: brcm: rely on generic DT parsing done in nand_scan_ident()

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
8 years agomtd: nand: omap2: rely on generic DT parsing done in nand_scan_ident()
Boris Brezillon [Tue, 19 Apr 2016 18:29:58 +0000 (20:29 +0200)] 
mtd: nand: omap2: rely on generic DT parsing done in nand_scan_ident()

The core now takes care of parsing generic DT properties in
nand_scan_ident() when nand_set_flash_node() has been called.
Rely on this initialization instead of calling of_get_nand_xxx()
manually.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Tested-by: Franklin S Cooper Jr. <fcooper@ti.com>
8 years agomtd: nand: remove unneeded of_mtd.h inclusions
Boris Brezillon [Fri, 1 Apr 2016 12:54:21 +0000 (14:54 +0200)] 
mtd: nand: remove unneeded of_mtd.h inclusions

Some drivers are including linux/of_mtd.h even if they don't use any of
the of_get_nand_xxx() helpers.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Harvey Hunt <harvey.hunt@imgtec.com>
8 years agomtd: nand: s3c2410: fix bug in s3c2410_nand_correct_data()
Zhaoxiu Zeng [Tue, 12 Apr 2016 07:30:35 +0000 (15:30 +0800)] 
mtd: nand: s3c2410: fix bug in s3c2410_nand_correct_data()

If there is only one bit difference in the ECC, the function should
return 1.
The result of "diff0 & ~(1<<fls(diff0))" is equal to diff0, so the
function actually returns -1.

Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd/ifc: Add support for IFC controller version 2.0
Raghav Dogra [Wed, 17 Feb 2016 11:24:18 +0000 (16:54 +0530)] 
mtd/ifc: Add support for IFC controller version 2.0

The new IFC controller version 2.0 has a different memory map page.
Upto IFC 1.4 PAGE size is 4 KB and from IFC2.0 PAGE size is 64KB.
This patch segregates the IFC global and runtime registers to appropriate
PAGE sizes.

Signed-off-by: Jaiprakash Singh <b44839@freescale.com>
Signed-off-by: Raghav Dogra <raghav@freescale.com>
Acked-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Raghav Dogra <raghav.dogra@nxp.com>
Acked-by: Scott Wood <oss@buserror.net>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: Remove BUG() abuse in nand_scan_tail
Ezequiel García [Fri, 1 Apr 2016 21:29:24 +0000 (18:29 -0300)] 
mtd: nand: Remove BUG() abuse in nand_scan_tail

There's no reason to BUG() when parameters are being
validated. Drivers can get things wrong, and it's much nicer
to just throw a noisy warn and fail gracefully, than calling
BUG() and throwing the whole system down the drain.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: gpmi: fix raw_buffer pointer double free issue
Han Xu [Mon, 4 Apr 2016 20:41:29 +0000 (15:41 -0500)] 
mtd: gpmi: fix raw_buffer pointer double free issue

fix the raw_buffer pointer double free issue found by coverify.

CID 18344 (#2 of 2): Double free (USE_AFTER_FREE)
3. double_free: Calling gpmi_alloc_dma_buffer frees pointer
this->raw_buffer which has already been freed

Signed-off-by: Han Xu <han.xu@nxp.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: brcmnand: Add support for v6.2 controllers
Florian Fainelli [Thu, 10 Mar 2016 23:34:16 +0000 (15:34 -0800)] 
mtd: brcmnand: Add support for v6.2 controllers

Document and match the brcm,brcmnand-v6.2 compatible string, the controller has
a register layout identical to the v6.0 version and supports prefetch. Update the
command shift logic to account for v6.2 controller which are the first ones to
use a shift of 0 (6.1 used a shift of 24).

Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: document the NAND controller/NAND chip DT representation
Boris Brezillon [Fri, 1 Apr 2016 12:26:35 +0000 (14:26 +0200)] 
mtd: nand: document the NAND controller/NAND chip DT representation

Standardize the NAND controller/NAND chip DT representation. Now, all new
NAND controller drivers should comply with this representation, even if
they are only supporting a single NAND chip.

Existing drivers can keep support for the old representation (where only
the NAND chip was described), but are encouraged to also support the new
one.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
8 years agomtd: nand: jz4780: fixup, device structure assigned at probe
Jorge Ramirez-Ortiz [Thu, 24 Mar 2016 01:53:27 +0000 (21:53 -0400)] 
mtd: nand: jz4780: fixup, device structure assigned at probe

bch->dev is already assigned to &pdev->dev in the probe function.
Remove the duplicate assignment done in jz4780_bch_get().

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Acked-by: Harvey Hunt <harvey.hunt@imgtec.com>
8 years agomtd: nand: atmel: correct bitflips in erased pages for pre-sama5d4 SoCs
Boris Brezillon [Tue, 1 Mar 2016 13:11:52 +0000 (14:11 +0100)] 
mtd: nand: atmel: correct bitflips in erased pages for pre-sama5d4 SoCs

New atmel SoCs are able to fix bitflips in erased pages, but old ones
are still impacted by this problem. Use nand_check_erased_ecc_chunk() to
handle this case.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: Herve Codina <herve.CODINA@celad.com>
Reviewed-by: Herve Codina <herve.CODINA@celad.com>
Tested-by: Herve Codina <herve.CODINA@celad.com>
8 years agomtd: nand: nandsim: set ECC algorithm explicitly
Rafał Miłecki [Wed, 23 Mar 2016 10:19:03 +0000 (11:19 +0100)] 
mtd: nand: nandsim: set ECC algorithm explicitly

This follows recent work on switching to enum nand_ecc_algo and
deprecating NAND_ECC_SOFT_BCH.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: set ECC algorithm in nand_dt_init
Rafał Miłecki [Wed, 23 Mar 2016 10:19:02 +0000 (11:19 +0100)] 
mtd: nand: set ECC algorithm in nand_dt_init

Use recently added of_get_nand_ecc_algo for that.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agoof: mtd: prepare helper reading NAND ECC algo from DT
Rafał Miłecki [Wed, 23 Mar 2016 10:19:01 +0000 (11:19 +0100)] 
of: mtd: prepare helper reading NAND ECC algo from DT

NAND subsystem is being slightly reworked to store ECC details in
separated fields. In future we'll want to add support for more DT
properties as specifying every possible setup with a single
"nand-ecc-mode" is a pretty bad idea.
To allow this let's add a helper that will support something like
"nand-ecc-algo" in future. Right now we use it for keeping backward
compatibility.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agomtd: nand: add new enum for storing ECC algorithm
Rafał Miłecki [Wed, 23 Mar 2016 10:19:00 +0000 (11:19 +0100)] 
mtd: nand: add new enum for storing ECC algorithm

Our nand_ecc_modes_t is already a bit abused by value NAND_ECC_SOFT_BCH.
This enum should store ECC mode only and putting algorithm details there
is a bad idea. It would result in too many values impossible to support
in a sane way.

To solve this problem let's add a new enum. We'll have to modify all
drivers to set it properly but once it's done it'll be possible to drop
NAND_ECC_SOFT_BCH. That will result in a cleaner design and more
possibilities like setting ECC algorithm for hardware ECC mode.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
8 years agoMerge branch 'mtd-nand-trigger' of git://git.kernel.org/pub/scm/linux/kernel/git...
Boris Brezillon [Tue, 19 Apr 2016 19:44:11 +0000 (21:44 +0200)] 
Merge branch 'mtd-nand-trigger' of git://git./linux/kernel/git/j.anaszewski/linux-leds into nand/next

Pull leds-trigger changes from Jacek Anaszewski.
Create a generic mtd led-trigger to replace the exisitng nand led-trigger
implementation.

* 'mtd-nand-trigger' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  mtd: Hook I/O activity to the MTD LED trigger
  mtd: nand: Remove the "nand-disk" LED trigger
  leds: trigger: Introduce a MTD (NAND/NOR) trigger
  mtd: Uninline mtd_write_oob and move it to mtdcore.c
  leds: trigger: Introduce a kernel panic LED trigger

8 years agoMerge branch 'for-v4.7/gpmc-mtd-common' of github.com:rogerq/linux into nand/next
Boris Brezillon [Tue, 19 Apr 2016 19:39:22 +0000 (21:39 +0200)] 
Merge branch 'for-v4.7/gpmc-mtd-common' of github.com:rogerq/linux into nand/next

Pull NAND/GPMC updates from Roger Quadros:
 "We do a couple of things in this series which result in cleaner device
  tree implementation, faster perfomance and multi-platform support. As
  an added bonus we get to use the GPMC_WAIT pins as GPI/Interrupts.

  - Establish a custom interface between NAND and GPMC driver. This is
    needed because all of the NAND registers sit in the GPMC register
    space.

  - Clean up device tree support so that omap-gpmc IP and the omap2 NAND
    driver can be used on non-OMAP platforms. e.g. Keystone.

  - Implement GPIOCHIP for the GPMC WAITPINS. SoCs can contain 2 to 4 of
    these and most of them would be unused otherwise. It also allows a
    cleaner implementation of NAND Ready pin status for the NAND driver.

  - Implement GPMC IRQ domain to proivde the 2 NAND events and GPMC
    WAITPIN edge interrupts.

  - Implement GPIOlib based NAND ready pin checking for OMAP NAND driver.
    On dra7-evm, Read speed increases from 13768 KiB/ to 17246 KiB/s.
    Write speed was unchanged at 7123 KiB/s."

* 'for-v4.7/gpmc-mtd-common' of github.com:rogerq/linux:
  mtd: nand: omap2: Implement NAND ready using gpiolib
  memory: omap-gpmc: Prevent GPMC_STATUS from being accessed via gpmc_regs
  memory: omap-gpmc: Support WAIT pin edge interrupts
  memory: omap-gpmc: Reserve WAITPIN if needed for WAIT monitoring
  memory: omap-gpmc: Support general purpose input for WAITPINs
  memory: omap-gpmc: Move device tree binding to correct location
  memory: omap-gpmc: Prevent mapping into 1st 16MB
  mtd: nand: omap: Update DT binding documentation
  mtd: nand: omap: Clean up device tree support
  mtd: nand: omap: Copy platform data parameters to omap_nand_info data
  mtd: nand: omap: Switch to using GPMC-NAND ops for writebuffer empty check
  mtd: nand: omap: Use gpmc_omap_get_nand_ops() to get NAND registers
  memory: omap-gpmc: Implement IRQ domain for NAND IRQs
  memory: omap-gpmc: Add GPMC-NAND ops to get writebufferempty status
  memory: omap-gpmc: Introduce GPMC to NAND interface
  ARM: OMAP2+: gpmc: Add gpmc timings and settings to platform data
  ARM: OMAP2+: gpmc: Add platform data

8 years agomtd: nand: omap2: Implement NAND ready using gpiolib
Roger Quadros [Thu, 6 Aug 2015 14:39:35 +0000 (17:39 +0300)] 
mtd: nand: omap2: Implement NAND ready using gpiolib

The GPMC WAIT pin status are now available over gpiolib.
Update the omap_dev_ready() function to use gpio instead of
directly accessing GPMC register space.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Prevent GPMC_STATUS from being accessed via gpmc_regs
Roger Quadros [Fri, 7 Aug 2015 07:38:13 +0000 (10:38 +0300)] 
memory: omap-gpmc: Prevent GPMC_STATUS from being accessed via gpmc_regs

GPMC_STATUS register is private to the GPMC module and must not be
accessed directly by NAND driver through the gpmc_regs.

They must use gpmc_omap_get_nand_ops() instead.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Support WAIT pin edge interrupts
Roger Quadros [Fri, 19 Feb 2016 09:01:02 +0000 (11:01 +0200)] 
memory: omap-gpmc: Support WAIT pin edge interrupts

OMAPs can have 2 to 4 WAITPINs that can be used as edge triggered
interrupts if not used for memory wait state insertion.

Support these interrupts via the gpmc IRQ domain.

The gpmc IRQ domain interrupt map is:

0 - NAND_fifoevent
1 - NAND_termcount
2 - GPMC_WAIT0 edge
3 - GPMC_WAIT1 edge, and so on

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Reserve WAITPIN if needed for WAIT monitoring
Roger Quadros [Thu, 6 Aug 2015 10:21:40 +0000 (13:21 +0300)] 
memory: omap-gpmc: Reserve WAITPIN if needed for WAIT monitoring

If the device attached to GPMC wants to use the WAIT pin
for WAIT monitoring then we reserve it internally for
exclusive use.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Support general purpose input for WAITPINs
Roger Quadros [Mon, 7 Mar 2016 10:18:43 +0000 (12:18 +0200)] 
memory: omap-gpmc: Support general purpose input for WAITPINs

OMAPs can have 2 to 4 WAITPINs that can be used as general purpose
input if not used for memory wait state insertion.

The first user will be the OMAP NAND chip to get the NAND
read/busy status using gpiolib.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Move device tree binding to correct location
Roger Quadros [Wed, 5 Aug 2015 14:01:54 +0000 (17:01 +0300)] 
memory: omap-gpmc: Move device tree binding to correct location

omap-gpmc.c is a memory controller so move the binding to the
right place.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Prevent mapping into 1st 16MB
Roger Quadros [Thu, 9 Jul 2015 14:31:45 +0000 (17:31 +0300)] 
memory: omap-gpmc: Prevent mapping into 1st 16MB

We have been preventing mapping GPMC children in the
first 1MB but really it has to be the first 16MB as
the minimum GPMC partition size is 16MB.

Also print an error message if CS mapping fails
due to DT requesting address outside the GPMC
map.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomtd: nand: omap: Update DT binding documentation
Roger Quadros [Mon, 26 May 2014 08:54:45 +0000 (11:54 +0300)] 
mtd: nand: omap: Update DT binding documentation

Add compatible id and interrupts. The NAND interrupts are
provided by the GPMC controller node.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomtd: nand: omap: Clean up device tree support
Roger Quadros [Wed, 21 May 2014 04:29:03 +0000 (07:29 +0300)] 
mtd: nand: omap: Clean up device tree support

Move NAND specific device tree parsing to NAND driver.

The NAND controller node must have a compatible id, register space
resource and interrupt resource.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomtd: nand: omap: Copy platform data parameters to omap_nand_info data
Roger Quadros [Tue, 20 May 2014 19:29:28 +0000 (22:29 +0300)] 
mtd: nand: omap: Copy platform data parameters to omap_nand_info data

Copy all the platform data parameters to the driver's local data
structure 'omap_nand_info' and use it in the entire driver. This will
make it easer for device tree migration.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomtd: nand: omap: Switch to using GPMC-NAND ops for writebuffer empty check
Roger Quadros [Wed, 5 Aug 2015 10:36:43 +0000 (13:36 +0300)] 
mtd: nand: omap: Switch to using GPMC-NAND ops for writebuffer empty check

Instead of accessing the gpmc_status register directly start
using the gpmc_nand_ops->nand_writebuffer_empty() helper
to check write buffer empty status.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomtd: nand: omap: Use gpmc_omap_get_nand_ops() to get NAND registers
Roger Quadros [Wed, 5 Aug 2015 11:01:50 +0000 (14:01 +0300)] 
mtd: nand: omap: Use gpmc_omap_get_nand_ops() to get NAND registers

Deprecate nand register passing via platform data and use
gpmc_omap_get_nand_ops() instead.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Implement IRQ domain for NAND IRQs
Roger Quadros [Thu, 30 Jul 2015 11:49:23 +0000 (14:49 +0300)] 
memory: omap-gpmc: Implement IRQ domain for NAND IRQs

GPMC provides 2 interrupts for NAND use. i.e. fifoevent and termcount.
Use IRQ domain for this. NAND device tree node can then
get the necessary interrupts by using gpmc as the interrupt parent.

Legacy boot uses gpmc_get_client_irq to get the
NAND interrupts from the GPMC IRQ domain.
Get rid of custom bitmasks and use IRQ domain for that
as well.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Add GPMC-NAND ops to get writebufferempty status
Roger Quadros [Wed, 5 Aug 2015 10:34:50 +0000 (13:34 +0300)] 
memory: omap-gpmc: Add GPMC-NAND ops to get writebufferempty status

This is needed by OMAP NAND driver to poll the empty status
of the writebuffer.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomemory: omap-gpmc: Introduce GPMC to NAND interface
Roger Quadros [Wed, 5 Aug 2015 10:58:01 +0000 (13:58 +0300)] 
memory: omap-gpmc: Introduce GPMC to NAND interface

The OMAP GPMC module has certain registers dedicated for NAND
access and some NAND bits mixed with other GPMC functionality.

For the NAND dedicated registers we have the struct gpmc_nand_regs.

The NAND driver needs to access NAND specific bits from the
following non-dedicated registers
- EMPTYWRITEBUFFERSTATUS from GPMC_STATUS

For accessing these bits we introduce the struct gpmc_nand_ops.

Add gpmc_omap_get_nand_ops() that returns the gpmc_nand_ops along
with updating the gpmc_nand_regs. This API will be called by the
OMAP NAND driver to access the necessary bits in GPMC register space.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agoARM: OMAP2+: gpmc: Add gpmc timings and settings to platform data
Roger Quadros [Fri, 10 Jul 2015 12:23:29 +0000 (15:23 +0300)] 
ARM: OMAP2+: gpmc: Add gpmc timings and settings to platform data

Add device_timings, gpmc_timings and gpmc_setting to
gpmc platform data.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agoARM: OMAP2+: gpmc: Add platform data
Roger Quadros [Fri, 10 Jul 2015 12:23:28 +0000 (15:23 +0300)] 
ARM: OMAP2+: gpmc: Add platform data

Add a platform data structure for GPMC. It contains all the necessary
platform information that needs to be passed from platform init code
to GPMC driver.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
8 years agomtd: Hook I/O activity to the MTD LED trigger
Ezequiel Garcia [Tue, 12 Apr 2016 20:46:42 +0000 (17:46 -0300)] 
mtd: Hook I/O activity to the MTD LED trigger

Now that we've added the MTD LED trigger, we need
to call each I/O path to ledtrig_mtd_activity.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
8 years agomtd: nand: Remove the "nand-disk" LED trigger
Ezequiel Garcia [Tue, 12 Apr 2016 20:46:41 +0000 (17:46 -0300)] 
mtd: nand: Remove the "nand-disk" LED trigger

This commit removes the "nand-disk" LED trigger from the
NAND code.

A trigger with the same name is already available selecting
LEDS_TRIGGER_MTD. Note that "nand-disk" trigger is being
deprecated in favor of the "mtd" trigger.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
8 years agoleds: trigger: Introduce a MTD (NAND/NOR) trigger
Ezequiel Garcia [Tue, 12 Apr 2016 20:46:40 +0000 (17:46 -0300)] 
leds: trigger: Introduce a MTD (NAND/NOR) trigger

This commit introduces a MTD trigger for flash (NAND/NOR) device
activity. The implementation is copied from IDE disk.

This trigger deprecates the "nand-disk" LED trigger, but for backwards
compatibility, we still keep the "nand-disk" trigger around.

The motivation for deprecating the "nand-disk" LED trigger is that
it only works for NAND drivers, whereas the "mtd" LED trigger
is more generic (in fact, "nand-disk" currently only works for
certain NAND drivers).

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
8 years agomtd: Uninline mtd_write_oob and move it to mtdcore.c
Ezequiel Garcia [Tue, 12 Apr 2016 20:46:39 +0000 (17:46 -0300)] 
mtd: Uninline mtd_write_oob and move it to mtdcore.c

There's no reason for having mtd_write_oob inlined in mtd.h header.
Move it to mtdcore.c where it belongs.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
8 years agoleds: trigger: Introduce a kernel panic LED trigger
Ezequiel Garcia [Tue, 29 Mar 2016 20:35:47 +0000 (17:35 -0300)] 
leds: trigger: Introduce a kernel panic LED trigger

This commit introduces a new LED trigger which allows to configure
a LED to blink on a kernel panic (through panic_blink).

Notice that currently the Openmoko FreeRunner (GTA02) mach code
sets panic_blink to blink a hard-coded LED. The new trigger is
meant to introduce a generic mechanism to achieve this.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
8 years agoLinux 4.6-rc1
Linus Torvalds [Sat, 26 Mar 2016 23:03:24 +0000 (16:03 -0700)] 
Linux 4.6-rc1

8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
Linus Torvalds [Sat, 26 Mar 2016 22:53:16 +0000 (15:53 -0700)] 
Merge branch 'for-linus' of git://git./linux/kernel/git/sage/ceph-client

Pull Ceph updates from Sage Weil:
 "There is quite a bit here, including some overdue refactoring and
  cleanup on the mon_client and osd_client code from Ilya, scattered
  writeback support for CephFS and a pile of bug fixes from Zheng, and a
  few random cleanups and fixes from others"

[ I already decided not to pull this because of it having been rebased
  recently, but ended up changing my mind after all.  Next time I'll
  really hold people to it.  Oh well.   - Linus ]

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (34 commits)
  libceph: use KMEM_CACHE macro
  ceph: use kmem_cache_zalloc
  rbd: use KMEM_CACHE macro
  ceph: use lookup request to revalidate dentry
  ceph: kill ceph_get_dentry_parent_inode()
  ceph: fix security xattr deadlock
  ceph: don't request vxattrs from MDS
  ceph: fix mounting same fs multiple times
  ceph: remove unnecessary NULL check
  ceph: avoid updating directory inode's i_size accidentally
  ceph: fix race during filling readdir cache
  libceph: use sizeof_footer() more
  ceph: kill ceph_empty_snapc
  ceph: fix a wrong comparison
  ceph: replace CURRENT_TIME by current_fs_time()
  ceph: scattered page writeback
  libceph: add helper that duplicates last extent operation
  libceph: enable large, variable-sized OSD requests
  libceph: osdc->req_mempool should be backed by a slab pool
  libceph: make r_request msg_size calculation clearer
  ...

8 years agoMerge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap...
Linus Torvalds [Sat, 26 Mar 2016 19:59:04 +0000 (12:59 -0700)] 
Merge tag 'ofs-pull-tag-1' of git://git./linux/kernel/git/hubcap/linux

Pull orangefs filesystem from Mike Marshall.

This finally merges the long-pending orangefs filesystem, which has been
much cleaned up with input from Al Viro over the last six months.  From
the documentation file:

 "OrangeFS is an LGPL userspace scale-out parallel storage system.  It
  is ideal for large storage problems faced by HPC, BigData, Streaming
  Video, Genomics, Bioinformatics.

  Orangefs, originally called PVFS, was first developed in 1993 by Walt
  Ligon and Eric Blumer as a parallel file system for Parallel Virtual
  Machine (PVM) as part of a NASA grant to study the I/O patterns of
  parallel programs.

  Orangefs features include:

    - Distributes file data among multiple file servers
    - Supports simultaneous access by multiple clients
    - Stores file data and metadata on servers using local file system
      and access methods
    - Userspace implementation is easy to install and maintain
    - Direct MPI support
    - Stateless"

see Documentation/filesystems/orangefs.txt for more in-depth details.

* tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux: (174 commits)
  orangefs: fix orangefs_superblock locking
  orangefs: fix do_readv_writev() handling of error halfway through
  orangefs: have ->kill_sb() evict the VFS side of things first
  orangefs: sanitize ->llseek()
  orangefs-bufmap.h: trim unused junk
  orangefs: saner calling conventions for getting a slot
  orangefs_copy_{to,from}_bufmap(): don't pass bufmap pointer
  orangefs: get rid of readdir_handle_s
  ornagefs: ensure that truncate has an up to date inode size
  orangefs: move code which sets i_link to orangefs_inode_getattr
  orangefs: remove needless wrapper around GFP_KERNEL
  orangefs: remove wrapper around mutex_lock(&inode->i_mutex)
  orangefs: refactor inode type or link_target change detection
  orangefs: use new getattr for revalidate and remove old getattr
  orangefs: use new getattr in inode getattr and permission
  orangefs: use new orangefs_inode_getattr to get size in write and llseek
  orangefs: use new orangefs_inode_getattr to create new inodes
  orangefs: rename orangefs_inode_getattr to orangefs_inode_old_getattr
  orangefs: remove inode->i_lock wrapper
  orangefs: put register_chrdev immediately before register_filesystem
  ...

8 years agoMerge tag 'ntb-4.6' of git://github.com/jonmason/ntb
Linus Torvalds [Sat, 26 Mar 2016 18:37:42 +0000 (11:37 -0700)] 
Merge tag 'ntb-4.6' of git://github.com/jonmason/ntb

Pull NTB bug fixes from Jon Mason:
 "NTB bug fixes for tasklet from spinning forever, link errors,
  translation window setup, NULL ptr dereference, and ntb-perf errors.

  Also, a modification to the driver API that makes _addr functions
  optional"

* tag 'ntb-4.6' of git://github.com/jonmason/ntb:
  NTB: Remove _addr functions from ntb_hw_amd
  NTB: Make _addr functions optional in the API
  NTB: Fix incorrect clean up routine in ntb_perf
  NTB: Fix incorrect return check in ntb_perf
  ntb: fix possible NULL dereference
  ntb: add missing setup of translation window
  ntb: stop link work when we do not have memory
  ntb: stop tasklet from spinning forever during shutdown.
  ntb: perf test: fix address space confusion

8 years agoMerge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 26 Mar 2016 18:31:01 +0000 (11:31 -0700)] 
Merge tag 'scsi-misc' of git://git./linux/kernel/git/jejb/scsi

Pull more SCSI updates from James Bottomley:
 "The only new stuff which missed the first pull request is an update to
  the UFS driver.

  The rest is an assortment of bug fixes and minor tweaks which appeared
  recently (some are fixes for recent code and some are stuff spotted
  recently by the checkers or the new gcc-6 compiler [most of Arnd's
  stuff])"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (32 commits)
  scsi_common: do not clobber fixed sense information
  scsi: ufs: select CONFIG_NLS
  scsi: fc: use get/put_unaligned64 for wwn access
  fnic: move printk()s outside of the critical code section.
  qla2xxx: avoid maybe_uninitialized warning
  megaraid_sas: add missing curly braces in ioctl handler
  lpfc: fix misleading indentation
  scsi_transport_sas: add 'scsi_target_id' sysfs attribute
  scsi_dh_alua: uninitialized variable in alua_check_vpd()
  scsi: ufs-qcom: add printouts of testbus debug registers
  scsi: ufs-qcom: enable/disable the device ref clock
  scsi: ufs-qcom: set PA_Local_TX_LCC_Enable before link startup
  scsi: ufs: add device quirk delay before putting UFS rails in LPM
  scsi: ufs: fix leakage during link off state
  scsi: ufs: tune UniPro parameters to optimize hibern8 exit time
  scsi: ufs: handle non spec compliant bkops behaviour by device
  scsi: ufs: add retry for query descriptors
  scsi: ufs: add error recovery after DL NAC error
  scsi: ufs: make error handling bit faster
  scsi: ufs: disable vccq if it's not needed by UFS device
  ...

8 years agof2fs/crypto: fix xts_tweak initialization
Linus Torvalds [Sat, 26 Mar 2016 17:13:05 +0000 (10:13 -0700)] 
f2fs/crypto: fix xts_tweak initialization

Commit 0b81d07790726 ("fs crypto: move per-file encryption from f2fs
tree to fs/crypto") moved the f2fs crypto files to fs/crypto/ and
renamed the symbol prefixes from "f2fs_" to "fscrypt_" (and from "F2FS_"
to just "FS" for preprocessor symbols).

Because of the symbol renaming, it's a bit hard to see it as a file
move: use

    git show -M30 0b81d07790726

to lower the rename detection to just 30% similarity and make git show
the files as renamed (the header file won't be shown as a rename even
then - since all it contains is symbol definitions, it looks almost
completely different).

Even with the renames showing as renames, the diffs are not all that
easy to read, since so much is just the renames.  But Eric Biggers
noticed that it's not just all renames: the initialization of the
xts_tweak had been broken too, using the inode number rather than the
page offset.

That's not right - it makes the xfs_tweak the same for all pages of each
inode.  It _might_ make sense to make the xfs_tweak contain both the
offset _and_ the inode number, but not just the inode number.

Reported-by: Eric Biggers <ebiggers3@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoNTB: Remove _addr functions from ntb_hw_amd
Allen Hubbe [Mon, 21 Mar 2016 08:53:14 +0000 (04:53 -0400)] 
NTB: Remove _addr functions from ntb_hw_amd

Kernel zero day testing warned about address space confusion.  A virtual
iomem address was used where a physical address is expected.  The
offending functions implement an optional part of the api, so they are
removed.  They can be added later, after testing.

Fixes: a1b3695820aa490e58915d720a1438069813008b
Signed-off-by: Allen Hubbe <Allen.Hubbe@emc.com>
Acked-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agoorangefs: fix orangefs_superblock locking
Al Viro [Fri, 25 Mar 2016 23:56:34 +0000 (19:56 -0400)] 
orangefs: fix orangefs_superblock locking

* switch orangefs_remount() to taking ORANGEFS_SB(sb) instead of sb
* remove from the list _before_ orangefs_unmount() - request_mutex
in the latter will make sure that nothing observed in the loop in
ORANGEFS_DEV_REMOUNT_ALL handling will get freed until the end
of loop
* on removal, keep the forward pointer and zero the back one.  That
way we can drop and regain the spinlock in the loop body (again,
ORANGEFS_DEV_REMOUNT_ALL one) and still be able to get to the
rest of the list.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs: fix do_readv_writev() handling of error halfway through
Al Viro [Wed, 17 Feb 2016 01:15:43 +0000 (20:15 -0500)] 
orangefs: fix do_readv_writev() handling of error halfway through

Error should only be returned if nothing had been read/written.
Otherwise we need to report a short read/write instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs: have ->kill_sb() evict the VFS side of things first
Al Viro [Wed, 17 Feb 2016 02:08:29 +0000 (21:08 -0500)] 
orangefs: have ->kill_sb() evict the VFS side of things first

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs: sanitize ->llseek()
Al Viro [Wed, 17 Feb 2016 01:25:19 +0000 (20:25 -0500)] 
orangefs: sanitize ->llseek()

a) open files can't have NULL inodes
b) it's SEEK_END, not ORANGEFS_SEEK_END; no need to get cute.
c) make_bad_inode() on lseek()?

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs-bufmap.h: trim unused junk
Al Viro [Wed, 17 Feb 2016 01:12:04 +0000 (20:12 -0500)] 
orangefs-bufmap.h: trim unused junk

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs: saner calling conventions for getting a slot
Al Viro [Wed, 17 Feb 2016 01:10:26 +0000 (20:10 -0500)] 
orangefs: saner calling conventions for getting a slot

just have it return the slot number or -E... - the caller checks
the sign anyway

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs_copy_{to,from}_bufmap(): don't pass bufmap pointer
Al Viro [Wed, 17 Feb 2016 01:06:19 +0000 (20:06 -0500)] 
orangefs_copy_{to,from}_bufmap(): don't pass bufmap pointer

it's always __orangefs_bufmap

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoorangefs: get rid of readdir_handle_s
Al Viro [Wed, 17 Feb 2016 00:54:13 +0000 (19:54 -0500)] 
orangefs: get rid of readdir_handle_s

no point, really - we couldn't keep those across the calls of
getdents(); it would be too easy to DoS, having all slots exhausted.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
8 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 25 Mar 2016 23:59:11 +0000 (16:59 -0700)] 
Merge branch 'akpm' (patches from Andrew)

Merge fourth patch-bomb from Andrew Morton:
 "A lot more stuff than expected, sorry.  A bunch of ocfs2 reviewing was
  finished off.

   - mhocko's oom-reaper out-of-memory-handler changes

   - ocfs2 fixes and features

   - KASAN feature work

   - various fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (42 commits)
  thp: fix typo in khugepaged_scan_pmd()
  MAINTAINERS: fill entries for KASAN
  mm/filemap: generic_file_read_iter(): check for zero reads unconditionally
  kasan: test fix: warn if the UAF could not be detected in kmalloc_uaf2
  mm, kasan: stackdepot implementation. Enable stackdepot for SLAB
  arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections
  mm, kasan: add GFP flags to KASAN API
  mm, kasan: SLAB support
  kasan: modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right()
  include/linux/oom.h: remove undefined oom_kills_count()/note_oom_kill()
  mm/page_alloc: prevent merging between isolated and other pageblocks
  drivers/memstick/host/r592.c: avoid gcc-6 warning
  ocfs2: extend enough credits for freeing one truncate record while replaying truncate records
  ocfs2: extend transaction for ocfs2_remove_rightmost_path() and ocfs2_update_edge_lengths() before to avoid inconsistency between inode and et
  ocfs2/dlm: move lock to the tail of grant queue while doing in-place convert
  ocfs2: solve a problem of crossing the boundary in updating backups
  ocfs2: fix occurring deadlock by changing ocfs2_wq from global to local
  ocfs2/dlm: fix BUG in dlm_move_lockres_to_recovery_list
  ocfs2/dlm: fix race between convert and recovery
  ocfs2: fix a deadlock issue in ocfs2_dio_end_io_write()
  ...

8 years agoMerge tag 'pm+acpi-4.6-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Fri, 25 Mar 2016 23:55:37 +0000 (16:55 -0700)] 
Merge tag 'pm+acpi-4.6-rc1-3' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixlet from Rafael Wysocki:
 "One of commits in my previous pull request changed the permissions of
  drivers/power/avs/rockchip-io-domain.c to executable by mistake"

* tag 'pm+acpi-4.6-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Fix permissions of drivers/power/avs/rockchip-io-domain.c

8 years agoMerge tag 'please-pull-preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 25 Mar 2016 23:48:45 +0000 (16:48 -0700)] 
Merge tag 'please-pull-preadv2' of git://git./linux/kernel/git/aegl/linux

Pull ia64 update from Tony Luck:
 "Wire up new system calls p{read,write}v2 for ia64"

* tag 'please-pull-preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  [IA64] Enable preadv2 and pwritev2 syscalls for ia64

8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Fri, 25 Mar 2016 23:39:05 +0000 (16:39 -0700)] 
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

Pull more input updates from Dmitry Torokhov:
 "Second round of updates for the input subsystem.

  The BYD PS/2 protocol driver now uses absolute reporting mode and
  should behave more like other touchpads; Synaptics driver needed to
  extend one of its quirks to a newer firmware version, and a few USB
  drivers got tightened up checks for the contents of their descriptors"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: sur40 - fix DMA on stack
  Input: ati_remote2 - fix crashes on detecting device with invalid descriptor
  Input: synaptics - handle spurious release of trackstick buttons, again
  Input: synaptics-rmi4 - remove check of Non-NULL array
  Input: byd - enable absolute mode
  Input: ims-pcu - sanity check against missing interfaces
  Input: melfas_mip4 - add hw_version sysfs attribute

8 years agothp: fix typo in khugepaged_scan_pmd()
Kirill A. Shutemov [Fri, 25 Mar 2016 21:22:20 +0000 (14:22 -0700)] 
thp: fix typo in khugepaged_scan_pmd()

!PageLRU should lead to SCAN_PAGE_LRU, not SCAN_SCAN_ABORT result.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoMAINTAINERS: fill entries for KASAN
Andrey Ryabinin [Fri, 25 Mar 2016 21:22:17 +0000 (14:22 -0700)] 
MAINTAINERS: fill entries for KASAN

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm/filemap: generic_file_read_iter(): check for zero reads unconditionally
Nicolai Stange [Fri, 25 Mar 2016 21:22:14 +0000 (14:22 -0700)] 
mm/filemap: generic_file_read_iter(): check for zero reads unconditionally

If
 - generic_file_read_iter() gets called with a zero read length,
 - the read offset is at a page boundary,
 - IOCB_DIRECT is not set
-  and the page in question hasn't made it into the page cache yet,
then do_generic_file_read() will trigger a readahead with a req_size hint
of zero.

Since roundup_pow_of_two(0) is undefined, UBSAN reports

  UBSAN: Undefined behaviour in include/linux/log2.h:63:13
  shift exponent 64 is too large for 64-bit type 'long unsigned int'
  CPU: 3 PID: 1017 Comm: sa1 Tainted: G L 4.5.0-next-20160318+ #14
  [...]
  Call Trace:
   [...]
   [<ffffffff813ef61a>] ondemand_readahead+0x3aa/0x3d0
   [<ffffffff813ef61a>] ? ondemand_readahead+0x3aa/0x3d0
   [<ffffffff813c73bd>] ? find_get_entry+0x2d/0x210
   [<ffffffff813ef9c3>] page_cache_sync_readahead+0x63/0xa0
   [<ffffffff813cc04d>] do_generic_file_read+0x80d/0xf90
   [<ffffffff813cc955>] generic_file_read_iter+0x185/0x420
   [...]
   [<ffffffff81510b06>] __vfs_read+0x256/0x3d0
   [...]

when get_init_ra_size() gets called from ondemand_readahead().

The net effect is that the initial readahead size is arch dependent for
requested read lengths of zero: for example, since

  1UL << (sizeof(unsigned long) * 8)

evaluates to 1 on x86 while its result is 0 on ARMv7, the initial readahead
size becomes 4 on the former and 0 on the latter.

What's more, whether or not the file access timestamp is updated for zero
length reads is decided differently for the two cases of IOCB_DIRECT
being set or cleared: in the first case, generic_file_read_iter()
explicitly skips updating that timestamp while in the latter case, it is
always updated through the call to do_generic_file_read().

According to POSIX, zero length reads "do not modify the last data access
timestamp" and thus, the IOCB_DIRECT behaviour is POSIXly correct.

Let generic_file_read_iter() unconditionally check the requested read
length at its entry and return immediately with success if it is zero.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agokasan: test fix: warn if the UAF could not be detected in kmalloc_uaf2
Alexander Potapenko [Fri, 25 Mar 2016 21:22:11 +0000 (14:22 -0700)] 
kasan: test fix: warn if the UAF could not be detected in kmalloc_uaf2

Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, kasan: stackdepot implementation. Enable stackdepot for SLAB
Alexander Potapenko [Fri, 25 Mar 2016 21:22:08 +0000 (14:22 -0700)] 
mm, kasan: stackdepot implementation. Enable stackdepot for SLAB

Implement the stack depot and provide CONFIG_STACKDEPOT.  Stack depot
will allow KASAN store allocation/deallocation stack traces for memory
chunks.  The stack traces are stored in a hash table and referenced by
handles which reside in the kasan_alloc_meta and kasan_free_meta
structures in the allocated memory chunks.

IRQ stack traces are cut below the IRQ entry point to avoid unnecessary
duplication.

Right now stackdepot support is only enabled in SLAB allocator.  Once
KASAN features in SLAB are on par with those in SLUB we can switch SLUB
to stackdepot as well, thus removing the dependency on SLUB stack
bookkeeping, which wastes a lot of memory.

This patch is based on the "mm: kasan: stack depots" patch originally
prepared by Dmitry Chernenkov.

Joonsoo has said that he plans to reuse the stackdepot code for the
mm/page_owner.c debugging facility.

[akpm@linux-foundation.org: s/depot_stack_handle/depot_stack_handle_t]
[aryabinin@virtuozzo.com: comment style fixes]
Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoarch, ftrace: for KASAN put hard/soft IRQ entries into separate sections
Alexander Potapenko [Fri, 25 Mar 2016 21:22:05 +0000 (14:22 -0700)] 
arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections

KASAN needs to know whether the allocation happens in an IRQ handler.
This lets us strip everything below the IRQ entry point to reduce the
number of unique stack traces needed to be stored.

Move the definition of __irq_entry to <linux/interrupt.h> so that the
users don't need to pull in <linux/ftrace.h>.  Also introduce the
__softirq_entry macro which is similar to __irq_entry, but puts the
corresponding functions to the .softirqentry.text section.

Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, kasan: add GFP flags to KASAN API
Alexander Potapenko [Fri, 25 Mar 2016 21:22:02 +0000 (14:22 -0700)] 
mm, kasan: add GFP flags to KASAN API

Add GFP flags to KASAN hooks for future patches to use.

This patch is based on the "mm: kasan: unified support for SLUB and SLAB
allocators" patch originally prepared by Dmitry Chernenkov.

Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, kasan: SLAB support
Alexander Potapenko [Fri, 25 Mar 2016 21:21:59 +0000 (14:21 -0700)] 
mm, kasan: SLAB support

Add KASAN hooks to SLAB allocator.

This patch is based on the "mm: kasan: unified support for SLUB and SLAB
allocators" patch originally prepared by Dmitry Chernenkov.

Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agokasan: modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right()
Alexander Potapenko [Fri, 25 Mar 2016 21:21:56 +0000 (14:21 -0700)] 
kasan: modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right()

This patchset implements SLAB support for KASAN

Unlike SLUB, SLAB doesn't store allocation/deallocation stacks for heap
objects, therefore we reimplement this feature in mm/kasan/stackdepot.c.
The intention is to ultimately switch SLUB to use this implementation as
well, which will save a lot of memory (right now SLUB bloats each object
by 256 bytes to store the allocation/deallocation stacks).

Also neither SLUB nor SLAB delay the reuse of freed memory chunks, which
is necessary for better detection of use-after-free errors.  We
introduce memory quarantine (mm/kasan/quarantine.c), which allows
delayed reuse of deallocated memory.

This patch (of 7):

Rename kmalloc_large_oob_right() to kmalloc_pagealloc_oob_right(), as
the test only checks the page allocator functionality.  Also reimplement
kmalloc_large_oob_right() so that the test allocates a large enough
chunk of memory that still does not trigger the page allocator fallback.

Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoinclude/linux/oom.h: remove undefined oom_kills_count()/note_oom_kill()
Tetsuo Handa [Fri, 25 Mar 2016 21:21:53 +0000 (14:21 -0700)] 
include/linux/oom.h: remove undefined oom_kills_count()/note_oom_kill()

A leftover from commit c32b3cbe0d06 ("oom, PM: make OOM detection in the
freezer path raceless").

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm/page_alloc: prevent merging between isolated and other pageblocks
Vlastimil Babka [Fri, 25 Mar 2016 21:21:50 +0000 (14:21 -0700)] 
mm/page_alloc: prevent merging between isolated and other pageblocks

Hanjun Guo has reported that a CMA stress test causes broken accounting of
CMA and free pages:

> Before the test, I got:
> -bash-4.3# cat /proc/meminfo | grep Cma
> CmaTotal:         204800 kB
> CmaFree:          195044 kB
>
>
> After running the test:
> -bash-4.3# cat /proc/meminfo | grep Cma
> CmaTotal:         204800 kB
> CmaFree:         6602584 kB
>
> So the freed CMA memory is more than total..
>
> Also the the MemFree is more than mem total:
>
> -bash-4.3# cat /proc/meminfo
> MemTotal:       16342016 kB
> MemFree:        22367268 kB
> MemAvailable:   22370528 kB

Laura Abbott has confirmed the issue and suspected the freepage accounting
rewrite around 3.18/4.0 by Joonsoo Kim.  Joonsoo had a theory that this is
caused by unexpected merging between MIGRATE_ISOLATE and MIGRATE_CMA
pageblocks:

> CMA isolates MAX_ORDER aligned blocks, but, during the process,
> partialy isolated block exists. If MAX_ORDER is 11 and
> pageblock_order is 9, two pageblocks make up MAX_ORDER
> aligned block and I can think following scenario because pageblock
> (un)isolation would be done one by one.
>
> (each character means one pageblock. 'C', 'I' means MIGRATE_CMA,
> MIGRATE_ISOLATE, respectively.
>
> CC -> IC -> II (Isolation)
> II -> CI -> CC (Un-isolation)
>
> If some pages are freed at this intermediate state such as IC or CI,
> that page could be merged to the other page that is resident on
> different type of pageblock and it will cause wrong freepage count.

This was supposed to be prevented by CMA operating on MAX_ORDER blocks,
but since it doesn't hold the zone->lock between pageblocks, a race
window does exist.

It's also likely that unexpected merging can occur between
MIGRATE_ISOLATE and non-CMA pageblocks.  This should be prevented in
__free_one_page() since commit 3c605096d315 ("mm/page_alloc: restrict
max order of merging on isolated pageblock").  However, we only check
the migratetype of the pageblock where buddy merging has been initiated,
not the migratetype of the buddy pageblock (or group of pageblocks)
which can be MIGRATE_ISOLATE.

Joonsoo has suggested checking for buddy migratetype as part of
page_is_buddy(), but that would add extra checks in allocator hotpath
and bloat-o-meter has shown significant code bloat (the function is
inline).

This patch reduces the bloat at some expense of more complicated code.
The buddy-merging while-loop in __free_one_page() is initially bounded
to pageblock_border and without any migratetype checks.  The checks are
placed outside, bumping the max_order if merging is allowed, and
returning to the while-loop with a statement which can't be possibly
considered harmful.

This fixes the accounting bug and also removes the arguably weird state
in the original commit 3c605096d315 where buddies could be left
unmerged.

Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on isolated pageblock")
Link: https://lkml.org/lkml/2016/3/2/280
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Hanjun Guo <guohanjun@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Debugged-by: Laura Abbott <labbott@redhat.com>
Debugged-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org> [3.18+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agodrivers/memstick/host/r592.c: avoid gcc-6 warning
Arnd Bergmann [Fri, 25 Mar 2016 21:21:47 +0000 (14:21 -0700)] 
drivers/memstick/host/r592.c: avoid gcc-6 warning

The r592 driver relies on behavior of the DMA mapping API that is
normally observed but not guaranteed by the API.  Instead it uses a
runtime check to fail transfers if the API ever behaves

When CONFIG_NEED_SG_DMA_LENGTH is not set, one of the checks turns into a
comparison of a variable with itself, which gcc-6.0 now warns about:

drivers/memstick/host/r592.c: In function 'r592_transfer_fifo_dma':
drivers/memstick/host/r592.c:302:31: error: self-comparison always evaluates to false [-Werror=tautological-compare]
    (sg_dma_len(&dev->req->sg) < dev->req->sg.length)) {
                               ^

The check itself is not a problem, so this patch just rephrases the
condition in a way that gcc does not consider an indication of a mistake.
We already know that dev->req->sg.length was initially R592_LFIFO_SIZE, so
we can compare it to that constant again.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Quentin Lambert <lambert.quentin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoocfs2: extend enough credits for freeing one truncate record while replaying truncate...
Xue jiufei [Fri, 25 Mar 2016 21:21:44 +0000 (14:21 -0700)] 
ocfs2: extend enough credits for freeing one truncate record while replaying truncate records

Now function ocfs2_replay_truncate_records() first modifies tl_used,
then calls ocfs2_extend_trans() to extend transactions for gd and alloc
inode used for freeing clusters.  jbd2_journal_restart() may be called
and it may happen that tl_used in truncate log is decreased but the
clusters are not freed, which means these clusters are lost.  So we
should avoid extending transactions in these two operations.

Signed-off-by: joyce.xue <xuejiufei@huawei.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Acked-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoocfs2: extend transaction for ocfs2_remove_rightmost_path() and ocfs2_update_edge_len...
Xue jiufei [Fri, 25 Mar 2016 21:21:41 +0000 (14:21 -0700)] 
ocfs2: extend transaction for ocfs2_remove_rightmost_path() and ocfs2_update_edge_lengths() before to avoid inconsistency between inode and et

I found that jbd2_journal_restart() is called in some places without
keeping things consistently before.  However, jbd2_journal_restart() may
commit the handle's transaction and restart another one.  If the first
transaction is committed successfully while another not, it may cause
filesystem inconsistency or read only.  This is an effort to fix this
kind of problems.

This patch (of 3):

The following functions will be called while truncating an extent:
ocfs2_remove_btree_range
  -> ocfs2_start_trans
  -> ocfs2_remove_extent
     -> ocfs2_truncate_rec
       -> ocfs2_extend_rotate_transaction
         -> jbd2_journal_restart if jbd2_journal_extend fail
       -> ocfs2_rotate_tree_left
         -> ocfs2_remove_rightmost_path
             -> ocfs2_extend_rotate_transaction
               -> ocfs2_unlink_subtree
                -> ocfs2_update_edge_lengths
                  -> ocfs2_extend_trans
                    -> jbd2_journal_restart if jbd2_journal_extend fail
  -> ocfs2_et_update_clusters
  -> ocfs2_commit_trans

jbd2_journal_restart() may be called and it may happened that the buffers
dirtied in ocfs2_truncate_rec() are committed while buffers dirtied in
ocfs2_et_update_clusters() are not, the total clusters on extent tree and
i_clusters in ocfs2_dinode is inconsistency.  So the clusters got from
ocfs2_dinode is incorrect, and it also cause read-only problem when call
ocfs2_commit_truncate() with the error message: "Inode %llu has empty
extent block at %llu".

We should extend enough credits for function ocfs2_remove_rightmost_path
and ocfs2_update_edge_lengths to avoid this inconsistency.

Signed-off-by: joyce.xue <xuejiufei@huawei.com>
Acked-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoocfs2/dlm: move lock to the tail of grant queue while doing in-place convert
xuejiufei [Fri, 25 Mar 2016 21:21:38 +0000 (14:21 -0700)] 
ocfs2/dlm: move lock to the tail of grant queue while doing in-place convert

We have found a bug when two nodes doing umount one after another.

1) Node 1 migrate a lockres that has 3 locks in grant queue such as
   N2(PR)<->N3(NL)<->N4(PR) to N2.  After migration, lvb of the lock
   N3(NL) and N4(PR) are empty on node 2 because migration target do not
   copy lvb to these two lock.

2) Node 3 want to convert to PR, it can be granted in
   __dlmconvert_master(), and the order of these locks is unchanged.  The
   lvb of the lock N3(PR) on node 2 is copyed from lockres in function
   dlm_update_lvb() while the lvb of lock N4(PR) is still empty.

3) Node 2 want to leave domain, it will migrate this lockres to node 3.
   Then node 2 will trigger the BUG in dlm_prepare_lvb_for_migration()
   when adding the lock N4(PR) to mres with the following message because
   the lvb of mres is already copied from lock N3(PR), but the lvb of lock
   N4(PR) is empty.

"Mismatched lvb in lock cookie=%u:%llu, name=%.*s, node=%u"

[akpm@linux-foundation.org: tweak comment]
Signed-off-by: xuejiufei <xuejiufei@huawei.com>
Acked-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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