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authorIngo Molnar <mingo@elte.hu>2007-02-16 04:27:29 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 11:13:56 -0500
commit9f907c0144496e464bd5ed5a99a51227d63a9c0b (patch)
tree84adb214bab37327d4806ca5d0b91c3ba24c73ad /include/linux/jiffies.h
parent41cf54455da5e5dc847a9733d49ca23b5e7dd59e (diff)
[PATCH] Fix timeout overflow with jiffies
Prevent timeout overflow if timer ticks are behind jiffies (due to high softirq load or due to dyntick), by limiting the valid timeout range to MAX_LONG/2. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/jiffies.h')
-rw-r--r--include/linux/jiffies.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 9243cefa4512..c080f61fb024 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -142,13 +142,13 @@ static inline u64 get_jiffies_64(void)
142 * 142 *
143 * And some not so obvious. 143 * And some not so obvious.
144 * 144 *
145 * Note that we don't want to return MAX_LONG, because 145 * Note that we don't want to return LONG_MAX, because
146 * for various timeout reasons we often end up having 146 * for various timeout reasons we often end up having
147 * to wait "jiffies+1" in order to guarantee that we wait 147 * to wait "jiffies+1" in order to guarantee that we wait
148 * at _least_ "jiffies" - so "jiffies+1" had better still 148 * at _least_ "jiffies" - so "jiffies+1" had better still
149 * be positive. 149 * be positive.
150 */ 150 */
151#define MAX_JIFFY_OFFSET ((~0UL >> 1)-1) 151#define MAX_JIFFY_OFFSET ((LONG_MAX >> 1)-1)
152 152
153/* 153/*
154 * We want to do realistic conversions of time so we need to use the same 154 * We want to do realistic conversions of time so we need to use the same