linux-kernel - [tip:sched/core] sched, task_struct: stack_canary is not needed without CC

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Message-ID: <tip-1314562a9ae5f39f6f595656023c1baf970831ef@git.kernel.org>
Date:	Tue, 18 Aug 2009 13:48:37 GMT
From:	tip-bot for Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, h-shimamoto@...jp.nec.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched, task_struct: stack_canary is not needed without CC_STACKPROTECTOR

Commit-ID:  1314562a9ae5f39f6f595656023c1baf970831ef
Gitweb:     http://git.kernel.org/tip/1314562a9ae5f39f6f595656023c1baf970831ef
Author:     Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
AuthorDate: Tue, 18 Aug 2009 15:06:02 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 18 Aug 2009 15:45:11 +0200

sched, task_struct: stack_canary is not needed without CC_STACKPROTECTOR

The field stack_canary is only used with CC_STACKPROTECTOR.
This patch reduces task_struct size without CC_STACKPROTECTOR.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
LKML-Reference: <4A8A44CA.2020701@...jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 include/linux/sched.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 195d72d..7bc2d92 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1237,8 +1237,10 @@ struct task_struct {
 	pid_t pid;
 	pid_t tgid;
 
+#ifdef CONFIG_CC_STACKPROTECTOR
 	/* Canary value for the -fstack-protector gcc feature */
 	unsigned long stack_canary;
+#endif
 
 	/* 
 	 * pointers to (original) parent process, youngest child, younger sibling,
--
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