linux-kernel - [ 03/95] perf: arm64: Record the user-mode PC in the call chain.

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Date:	Tue, 25 Jun 2013 11:31:50 -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>,
	Ingo Molnar <mingo@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>
Subject: [ 03/95] perf: arm64: Record the user-mode PC in the call chain.

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jed Davis <jld@...illa.com>

commit abc41254181e901ef5eda2c884ca6cd88a186b6d 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,
and the corresponding change in arch/arm.

Signed-off-by: Jed Davis <jld@...illa.com>
Acked-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Will Deacon <will.deacon@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kernel/perf_event.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1336,6 +1336,7 @@ void perf_callchain_user(struct perf_cal
 		return;
 	}
 
+	perf_callchain_store(entry, regs->pc);
 	tail = (struct frame_tail __user *)regs->regs[29];
 
 	while (entry->nr < PERF_MAX_STACK_DEPTH &&


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