linux-kernel - [PATCH 3.12 53/64] compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles

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Message-Id: <8e2cad8bcff6f1b6f8c5ad19314c11159fa6f23f.1455198893.git.jslaby@suse.cz>
Date:	Thu, 11 Feb 2016 14:59:29 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Steven Noonan <steven@...inklabs.net>,
	Ingo Molnar <mingo@...nel.org>,
	Jakub Jelinek <jakub@...hat.com>,
	Richard Henderson <rth@...ddle.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 53/64] compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles

From: Steven Noonan <steven@...inklabs.net>

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

===============

commit 5631b8fba640a4ab2f8a954f63a603fa34eda96b upstream.

The bug referenced by the comment in this commit was not
completely fixed in GCC 4.8.2, as I mentioned in a thread back
in February:

   https://lkml.org/lkml/2014/2/12/797

The conclusion at that time was to make the quirk unconditional
until the bug could be found and fixed in GCC. Unfortunately,
when I submitted the patch (commit a9f18034) I left a comment
in that claimed the bug was fixed in GCC 4.8.2+.

This comment is inaccurate, and should be removed.

Signed-off-by: Steven Noonan <steven@...inklabs.net>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Jakub Jelinek <jakub@...hat.com>
Cc: Richard Henderson <rth@...ddle.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/1414274982-14040-1-git-send-email-steven@uplinklabs.net
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 include/linux/compiler-gcc4.h | 1 -
 include/linux/compiler-gcc5.h | 1 -
 2 files changed, 2 deletions(-)

diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index 2507fd2a1eb4..d1a558239b1a 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -71,7 +71,6 @@
  *   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
  *
  * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
- * Fixed in GCC 4.8.2 and later versions.
  *
  * (asm goto is automatically volatile - the naming reflects this.)
  */
diff --git a/include/linux/compiler-gcc5.h b/include/linux/compiler-gcc5.h
index cdd1cc202d51..c8c565952548 100644
--- a/include/linux/compiler-gcc5.h
+++ b/include/linux/compiler-gcc5.h
@@ -53,7 +53,6 @@
  *   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
  *
  * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
- * Fixed in GCC 4.8.2 and later versions.
  *
  * (asm goto is automatically volatile - the naming reflects this.)
  */
-- 
2.7.1