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Date: Thu, 18 Jul 2013 19:24:54 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jed Davis <jld@...illa.com>, Will Deacon <will.deacon@....com>, Russell King <rmk+kernel@....linux.org.uk> Subject: [ 22/24] ARM: 7765/1: perf: Record the user-mode PC in the call chain. 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jed Davis <jld@...illa.com> commit c5f927a6f62196226915f12194c9d0df4e2210d7 upstream. With this change, we no longer lose the innermost entry in the user-mode part of the call chain. See also the x86 port, which includes the ip. It's possible to partially work around this problem by post-processing the data to use the PERF_SAMPLE_IP value, but this works only if the CPU wasn't in the kernel when the sample was taken. Signed-off-by: Jed Davis <jld@...illa.com> Signed-off-by: Will Deacon <will.deacon@....com> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/arm/kernel/perf_event.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -824,6 +824,7 @@ perf_callchain_user(struct perf_callchai struct frame_tail __user *tail; + perf_callchain_store(entry, regs->ARM_pc); tail = (struct frame_tail __user *)regs->ARM_fp - 1; while ((entry->nr < PERF_MAX_STACK_DEPTH) && -- 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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