[ 3.8.y.z extended stable ] Patch "perf: arm64: Record the user-mode PC in the call chain." has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Jun 25 22:20:07 UTC 2013


This is a note to let you know that I have just added a patch titled

    perf: arm64: Record the user-mode PC in the call chain.

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.4.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 06f3ad7d868b6e88dcd2df90a90f9eb9d1eec1a2 Mon Sep 17 00:00:00 2001
From: Jed Davis <jld at mozilla.com>
Date: Thu, 20 Jun 2013 04:07:14 +0100
Subject: 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 at mozilla.com>
Acked-by: Ingo Molnar <mingo at kernel.org>
Acked-by: Will Deacon <will.deacon at arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
[ kamal: backport to 3.8 (context) ]
Signed-off-by: Kamal Mostafa <kamal at canonical.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 f7073c7..0256b68 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1331,6 +1331,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
 {
 	struct frame_tail __user *tail;

+	perf_callchain_store(entry, regs->pc);
 	tail = (struct frame_tail __user *)regs->regs[29];

 	while (entry->nr < PERF_MAX_STACK_DEPTH &&
--
1.8.1.2





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