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

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Date:	Wed, 19 Jun 2013 20:07:14 -0700
From:	Jed Davis <jld@...illa.com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [PATCH] perf: arm64: 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,
and the corresponding change in arch/arm.

Signed-off-by: Jed Davis <jld@...illa.com>
---
 arch/arm64/kernel/perf_event.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 1e49e5eb..9ba33c4 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1336,6 +1336,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
 		return;
 	}
 
+	perf_callchain_store(entry, regs->pc);
 	tail = (struct frame_tail __user *)regs->regs[29];
 
 	while (entry->nr < PERF_MAX_STACK_DEPTH &&
-- 
1.7.10.4

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