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authorJed Davis <jld@mozilla.com>2013-06-20 10:16:29 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-21 18:21:33 -0700
commitc9f3f7f79f3ee852f253bdb1dbbb43d79bcaa6c2 (patch)
tree186f03e513366b81ccd1053812c2b7e36bf3371b /arch/arm/kernel/perf_event.c
parent7557d8d5a46aaa4d0ec98bffdeedf9f3c7464088 (diff)
downloadvexpress-lsk-c9f3f7f79f3ee852f253bdb1dbbb43d79bcaa6c2.tar.gz
ARM: 7765/1: perf: Record the user-mode PC in the call chain.
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@mozilla.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/kernel/perf_event.c')
-rw-r--r--arch/arm/kernel/perf_event.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 8c3094d0f7b..d9f5cd4e533 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -569,6 +569,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
return;
}
+ perf_callchain_store(entry, regs->ARM_pc);
tail = (struct frame_tail __user *)regs->ARM_fp - 1;
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&