Merge branch 'remove-unlikely' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...

[deliverable/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 883901b9ac4f11d0ea47d42769c8ee3c6e3e3360..10d51c2f10d712b179f5e6f67d0b9032bb42b75c 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -571,6 +571,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        trust validation.
                        format: { id:<keyid> | builtin }
 
+       cca=            [MIPS] Override the kernel pages' cache coherency
+                       algorithm.  Accepted values range from 0 to 7
+                       inclusive. See arch/mips/include/asm/pgtable-bits.h
+                       for platform specific values (SB1, Loongson3 and
+                       others).
+
        ccw_timeout_log [S390]
                        See Documentation/s390/CommonIO for details.
 
@@ -1716,8 +1722,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        7 (KERN_DEBUG)          debug-level messages
 
        log_buf_len=n[KMG]      Sets the size of the printk ring buffer,
-                       in bytes.  n must be a power of two.  The default
-                       size is set in the kernel config file.
+                       in bytes.  n must be a power of two and greater
+                       than the minimal size. The minimal size is defined
+                       by LOG_BUF_SHIFT kernel config parameter. There is
+                       also CONFIG_LOG_CPU_MAX_BUF_SHIFT config parameter
+                       that allows to increase the default size depending on
+                       the number of CPUs. See init/Kconfig for more details.
 
        logo.nologo     [FB] Disables display of the built-in Linux logo.
                        This may be used to provide more screen space for
@@ -2190,6 +2200,21 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        and restore using xsave. The kernel will fallback to
                        enabling legacy floating-point and sse state.
 
+       noxsaveopt      [X86] Disables xsaveopt used in saving x86 extended
+                       register states. The kernel will fall back to use
+                       xsave to save the states. By using this parameter,
+                       performance of saving the states is degraded because
+                       xsave doesn't support modified optimization while
+                       xsaveopt supports it on xsaveopt enabled systems.
+
+       noxsaves        [X86] Disables xsaves and xrstors used in saving and
+                       restoring x86 extended register state in compacted
+                       form of xsave area. The kernel will fall back to use
+                       xsaveopt and xrstor to save and restore the states
+                       in standard form of xsave area. By using this
+                       parameter, xsave area per process might occupy more
+                       memory on xsaves enabled systems.
+
        eagerfpu=       [X86]
                        on      enable eager fpu restore
                        off     disable eager fpu restore
@@ -3054,6 +3079,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        S               [KNL] Run init in single mode
 
+       s390_iommu=     [HW,S390]
+                       Set s390 IOTLB flushing mode
+               strict
+                       With strict flushing every unmap operation will result in
+                       an IOTLB flush. Default is lazy flushing before reuse,
+                       which is faster.
+
        sa1100ir        [NET]
                        See drivers/net/irda/sa1100_ir.c.
 
@@ -3509,6 +3541,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                        bogus residue values);
                                s = SINGLE_LUN (the device has only one
                                        Logical Unit);
+                               u = IGNORE_UAS (don't bind to the uas driver);
                                w = NO_WP_DETECT (don't test whether the
                                        medium is write-protected).
                        Example: quirks=0419:aaf5:rl,0421:0433:rc
@@ -3728,6 +3761,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        Disables the ticketlock slowpath using Xen PV
                        optimizations.
 
+       xen_nopv        [X86]
+                       Disables the PV optimizations forcing the HVM guest to
+                       run as generic HVM guest with no PV drivers.
+
        xirc2ps_cs=     [NET,PCMCIA]
                        Format:
                        <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]