This is a note to let you know that I've just added the patch titled
ARM: 7765/1: perf: Record the user-mode PC in the call chain.
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-7765-1-perf-record-the-user-mode-pc-in-the-call-chain.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c5f927a6f62196226915f12194c9d0df4e2210d7 Mon Sep 17 00:00:00 2001
From: Jed Davis <[email protected]>
Date: Thu, 20 Jun 2013 10:16:29 +0100
Subject: ARM: 7765/1: perf: Record the user-mode PC in the call chain.
From: Jed Davis <[email protected]>
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 <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Russell King <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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) &&
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/arm-7765-1-perf-record-the-user-mode-pc-in-the-call-chain.patch
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