linux-kernel - [PATCH] task_struct: stack_canary is not needed without CC

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Message-ID: <4A8A44CA.2020701@ct.jp.nec.com>
Date:	Tue, 18 Aug 2009 15:06:02 +0900
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] task_struct: stack_canary is not needed without CC_STACKPROTECTOR

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

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>
---
 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 af1e328..962e457 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1247,8 +1247,10 @@ 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,
-- 
1.6.3.3

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