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Date: Thu, 3 Jan 2013 19:12:28 +0900 From: kpark3469@...il.com To: rostedt@...dmis.org Cc: fweisbec@...il.com, mingo@...hat.com, linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, sahara <keun-o.park@...driver.com> Subject: [PATCH 1/2] arm: fix returning wrong CALLER_ADDRx From: sahara <keun-o.park@...driver.com> This makes return_address return correct value for ftrace feature. unwind_frame does not update frame->lr but frame->pc for backtrace. And, the initialization for data.addr was missing so that wrong value returned when unwind_frame failed. Signed-off-by: sahara <keun-o.park@...driver.com> --- arch/arm/kernel/return_address.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c index 8085417..fafedd8 100644 --- a/arch/arm/kernel/return_address.c +++ b/arch/arm/kernel/return_address.c @@ -26,7 +26,7 @@ static int save_return_addr(struct stackframe *frame, void *d) struct return_address_data *data = d; if (!data->level) { - data->addr = (void *)frame->lr; + data->addr = (void *)frame->pc; return 1; } else { @@ -41,7 +41,8 @@ void *return_address(unsigned int level) struct stackframe frame; register unsigned long current_sp asm ("sp"); - data.level = level + 1; + data.level = level + 2; + data.addr = NULL; frame.fp = (unsigned long)__builtin_frame_address(0); frame.sp = current_sp; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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