linux-kernel - Re: [PATCH v3 3/7] arm64: ftrace: fix a stack tracer's output under function graph tracer

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Message-Id: <DBC9AC69-1187-4BF5-887D-23ACA29C2865@gmail.com>
Date:	Wed, 14 Oct 2015 00:24:24 +0900
From:	Jungseok Lee <jungseoklee85@...il.com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	catalin.marinas@....com, will.deacon@....com, rostedt@...dmis.org,
	olof@...om.net, broonie@...nel.org, david.griego@...aro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/7] arm64: ftrace: fix a stack tracer's output under function graph tracer

On Oct 8, 2015, at 7:01 PM, AKASHI Takahiro wrote:

Hi Akashi,

> Function graph tracer modifies a return address (LR) in a stack frame
> to hook a function return. This will result in many useless entries
> (return_to_handler) showing up in a stack tracer's output.
> 
> This patch replaces such entries with originals values preserved in
> current->ret_stack[].
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>

The following diff should be folded into this patch, not [7/7] one, to
address build breakage.

----8<----
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 407991b..7126d4d 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -17,6 +17,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/export.h>
+#include <linux/ftrace.h>
 #include <linux/sched.h>
 #include <linux/stacktrace.h>
----8<----

Best Regards
Jungseok Lee
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