path: root/arch/arm/kernel
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authorJed Davis <jld@mozilla.com>2013-06-20 10:16:29 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-06-24 15:23:29 +0100
commitc5f927a6f62196226915f12194c9d0df4e2210d7 (patch)
tree1e671090fae699d4327eb173682ae4115fb94dd8 /arch/arm/kernel
parenta4780adeefd042482f624f5e0d577bf9cdcbb760 (diff)
ARM: 7765/1: perf: Record the user-mode PC in the call chain.
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. Cc: <stable@vger.kernel.org> 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>
Diffstat (limited to 'arch/arm/kernel')
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 8c3094d0f7b7..d9f5cd4e533f 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)
+ perf_callchain_store(entry, regs->ARM_pc);
tail = (struct frame_tail __user *)regs->ARM_fp - 1;
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&