accounting to be spread across the timer interval, preventing a
"thundering herd" at every timer tick.
-config PREEMPT
- bool "Preemptible Kernel (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- help
- This option reduces the latency of the kernel when reacting to
- real-time or interactive events by allowing a low priority process to
- be preempted even if it is in kernel mode executing a system call.
- This allows applications to run more reliably even when the system is
- under load.
-
- Say Y here if you are building a kernel for a desktop, embedded
- or real-time system. Say N if you are unsure.
+source kernel/Kconfig.preempt
config HZ
int
source "net/Kconfig"
-menu "Device Drivers"
-
-source "drivers/base/Kconfig"
-
-source "drivers/connector/Kconfig"
-
-if ALIGNMENT_TRAP || !CPU_CP15_MMU
-source "drivers/mtd/Kconfig"
-endif
-
-source "drivers/parport/Kconfig"
-
-source "drivers/pnp/Kconfig"
-
-source "drivers/block/Kconfig"
-
-# misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
-
-source "drivers/misc/Kconfig"
-
-source "drivers/ide/Kconfig"
-
-source "drivers/scsi/Kconfig"
-
-source "drivers/ata/Kconfig"
-
-source "drivers/md/Kconfig"
-
-source "drivers/message/fusion/Kconfig"
-
-source "drivers/ieee1394/Kconfig"
-
-source "drivers/message/i2o/Kconfig"
-
-source "drivers/net/Kconfig"
-
-source "drivers/isdn/Kconfig"
-
-# input before char - char/joystick depends on it. As does USB.
-
-source "drivers/input/Kconfig"
-
-source "drivers/char/Kconfig"
-
-source "drivers/i2c/Kconfig"
-
-source "drivers/spi/Kconfig"
-
-source "drivers/gpio/Kconfig"
-
-source "drivers/w1/Kconfig"
-
-source "drivers/power/Kconfig"
-
-source "drivers/hwmon/Kconfig"
-
-source "drivers/thermal/Kconfig"
-
-source "drivers/watchdog/Kconfig"
-
-source "drivers/ssb/Kconfig"
-
-#source "drivers/l3/Kconfig"
-
-source "drivers/mfd/Kconfig"
-
-source "drivers/media/Kconfig"
-
-source "drivers/video/Kconfig"
-
-source "sound/Kconfig"
-
-source "drivers/hid/Kconfig"
-
-source "drivers/usb/Kconfig"
-
-source "drivers/uwb/Kconfig"
-
-source "drivers/mmc/Kconfig"
-
-source "drivers/memstick/Kconfig"
-
-source "drivers/accessibility/Kconfig"
-
-source "drivers/leds/Kconfig"
-
-source "drivers/rtc/Kconfig"
-
-source "drivers/dma/Kconfig"
-
-source "drivers/dca/Kconfig"
-
-source "drivers/auxdisplay/Kconfig"
-
-source "drivers/regulator/Kconfig"
-
-source "drivers/uio/Kconfig"
-
-source "drivers/staging/Kconfig"
-
-endmenu
+source "drivers/Kconfig"
source "fs/Kconfig"
* Enable and disable interrupts
*/
#if __LINUX_ARM_ARCH__ >= 6
- .macro disable_irq
+ .macro disable_irq_notrace
cpsid i
.endm
- .macro enable_irq
+ .macro enable_irq_notrace
cpsie i
.endm
#else
- .macro disable_irq
+ .macro disable_irq_notrace
msr cpsr_c, #PSR_I_BIT | SVC_MODE
.endm
- .macro enable_irq
+ .macro enable_irq_notrace
msr cpsr_c, #SVC_MODE
.endm
#endif
+ .macro asm_trace_hardirqs_off
+#if defined(CONFIG_TRACE_IRQFLAGS)
+ stmdb sp!, {r0-r3, ip, lr}
+ bl trace_hardirqs_off
+ ldmia sp!, {r0-r3, ip, lr}
+#endif
+ .endm
+
+ .macro asm_trace_hardirqs_on_cond, cond
+#if defined(CONFIG_TRACE_IRQFLAGS)
+ /*
+ * actually the registers should be pushed and pop'd conditionally, but
+ * after bl the flags are certainly clobbered
+ */
+ stmdb sp!, {r0-r3, ip, lr}
+ bl\cond trace_hardirqs_on
+ ldmia sp!, {r0-r3, ip, lr}
+#endif
+ .endm
+
+ .macro asm_trace_hardirqs_on
+ asm_trace_hardirqs_on_cond al
+ .endm
+
+ .macro disable_irq
+ disable_irq_notrace
+ asm_trace_hardirqs_off
+ .endm
+
+ .macro enable_irq
+ asm_trace_hardirqs_on
+ enable_irq_notrace
+ .endm
/*
* Save the current IRQ state and disable IRQs. Note that this macro
* assumes FIQs are enabled, and that the processor is in SVC mode.
* Restore interrupt state previously stored in a register. We don't
* guarantee that this will preserve the flags.
*/
- .macro restore_irqs, oldcpsr
+ .macro restore_irqs_notrace, oldcpsr
msr cpsr_c, \oldcpsr
.endm
+ .macro restore_irqs, oldcpsr
+ tst \oldcpsr, #PSR_I_BIT
+ asm_trace_hardirqs_on_cond eq
+ restore_irqs_notrace \oldcpsr
+ .endm
+
#define USER(x...) \
9999: x; \
.section __ex_table,"a"; \
#ifndef __ASSEMBLY__
extern void mcount(void);
+extern void __gnu_mcount_nc(void);
#endif
#endif
#ifdef CONFIG_FUNCTION_TRACER
EXPORT_SYMBOL(mcount);
+EXPORT_SYMBOL(__gnu_mcount_nc);
#endif
@ r4 - orig_r0 (see pt_regs definition in ptrace.h)
@
stmia r5, {r0 - r4}
+
+ asm_trace_hardirqs_off
.endm
.align 5
__irq_svc:
svc_entry
-#ifdef CONFIG_TRACE_IRQFLAGS
- bl trace_hardirqs_off
-#endif
#ifdef CONFIG_PREEMPT
get_thread_info tsk
ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
@ Clear FP to mark the first stack frame
@
zero_fp
+
+ asm_trace_hardirqs_off
.endm
.macro kuser_cmpxchg_check
usr_entry
kuser_cmpxchg_check
-#ifdef CONFIG_TRACE_IRQFLAGS
- bl trace_hardirqs_off
-#endif
get_thread_info tsk
#ifdef CONFIG_PREEMPT
ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
#else
+ENTRY(__gnu_mcount_nc)
+ stmdb sp!, {r0-r3, lr}
+ ldr r0, =ftrace_trace_function
+ ldr r2, [r0]
+ adr r0, ftrace_stub
+ cmp r0, r2
+ bne gnu_trace
+ ldmia sp!, {r0-r3, ip, lr}
+ bx ip
+
+gnu_trace:
+ ldr r1, [sp, #20] @ lr of instrumented routine
+ mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
+ mov lr, pc
+ mov pc, r2
+ ldmia sp!, {r0-r3, ip, lr}
+ bx ip
+
ENTRY(mcount)
stmdb sp!, {r0-r3, lr}
ldr r0, =ftrace_trace_function
tst r2, r0, lsl r3
\instr r2, r2, r0, lsl r3
\store r2, [r1]
- restore_irqs ip
moveq r0, #0
+ restore_irqs ip
mov pc, lr
.endm
#endif
.endm
.macro get_irqnr_preamble, base, tmp
+ ldr \base, =io_p2v(0x001ff000)
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
- mov \base, #io_p2v(0x00100000)
- add \base, \base, #0x000ff000
-
ldr \irqstat, [\base, #0]
clz \irqnr, \irqstat
rsb \irqnr, \irqnr, #31
projects / deliverable / linux.git / commitdiff
