linux-kernel - [tip:x86/debug] watchdog/hpwdt: Create stack frame in asminline

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Date:	Tue, 23 Feb 2016 01:04:40 -0800
From:	tip-bot for Josh Poimboeuf <tipbot@...or.com>@zytor.com
To:	linux-tip-commits@...r.kernel.org@...or.com
Cc:	hpa@...or.com, acme@...nel.org, torvalds@...ux-foundation.org,
	jslaby@...e.cz, brgerst@...il.com, mmarek@...e.cz,
	luto@...capital.net, jpoimboe@...hat.com,
	linux-kernel@...r.kernel.org, luto@...nel.org, bp@...en8.de,
	bernd@...rovitsch.priv.at, namhyung@...il.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, mingo@...nel.org, wim@...ana.be,
	chris.j.arges@...onical.com, palves@...hat.com,
	peterz@...radead.org, dvlasenk@...hat.com, linux@...ck-us.net
Subject: [tip:x86/debug] watchdog/hpwdt: Create stack frame in asminline_call()

Commit-ID:  a216c875a01520896c7ed9ea43779a3da4103ee9
Gitweb:     http://git.kernel.org/tip/a216c875a01520896c7ed9ea43779a3da4103ee9
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Thu, 21 Jan 2016 16:49:31 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 23 Feb 2016 09:04:00 +0100

watchdog/hpwdt: Create stack frame in asminline_call()

asminline_call() is a callable non-leaf function which doesn't honor
CONFIG_FRAME_POINTER, which can result in bad stack traces.

Create a stack frame when CONFIG_FRAME_POINTER is enabled.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Pedro Alves <palves@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Wim Van Sebroeck <wim@...ana.be>
Cc: linux-watchdog@...r.kernel.org
Cc: live-patching@...r.kernel.org
Link: http://lkml.kernel.org/r/60de3cfb6f16d413bfb923036cc87fec132df735.1453405861.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/watchdog/hpwdt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 92443c3..90016db 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -353,10 +353,10 @@ static int detect_cru_service(void)
 
 asm(".text                      \n\t"
     ".align 4                   \n\t"
-    ".globl asminline_call	\n"
+    ".globl asminline_call	\n\t"
+    ".type asminline_call, @function \n\t"
     "asminline_call:            \n\t"
-    "pushq      %rbp            \n\t"
-    "movq       %rsp, %rbp      \n\t"
+    FRAME_BEGIN
     "pushq      %rax            \n\t"
     "pushq      %rbx            \n\t"
     "pushq      %rdx            \n\t"
@@ -386,7 +386,7 @@ asm(".text                      \n\t"
     "popq       %rdx            \n\t"
     "popq       %rbx            \n\t"
     "popq       %rax            \n\t"
-    "leave                      \n\t"
+    FRAME_END
     "ret                        \n\t"
     ".previous");