From: Todd Android Poynor Date: Thu, 23 Dec 2010 00:52:44 +0000 (+0100) Subject: ARM: 6540/1: Stop irqsoff trace on return to user X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d13e5edd7284bedcf5952e1b6490e39ad843cb91;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git ARM: 6540/1: Stop irqsoff trace on return to user If the irqsoff tracer is in use, stop tracing the interrupt disable interval when returning to userspace. Tracing userspace execution time as interrupts disabled time is not helpful for kernel performance analysis purposes. Only do so if the irqsoff tracer is enabled, to avoid overhead for lockdep, which doesn't care. Signed-off-by: Todd Poynor Signed-off-by: Russell King --- diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 8bfa98757cd2..80bf8cd88d7c 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -29,6 +29,9 @@ ret_fast_syscall: ldr r1, [tsk, #TI_FLAGS] tst r1, #_TIF_WORK_MASK bne fast_work_pending +#if defined(CONFIG_IRQSOFF_TRACER) + asm_trace_hardirqs_on +#endif /* perform architecture specific actions before user return */ arch_ret_to_user r1, lr @@ -65,6 +68,9 @@ ret_slow_syscall: tst r1, #_TIF_WORK_MASK bne work_pending no_work_pending: +#if defined(CONFIG_IRQSOFF_TRACER) + asm_trace_hardirqs_on +#endif /* perform architecture specific actions before user return */ arch_ret_to_user r1, lr