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[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>
This commit is contained in:
Ingo Molnar 2007-02-16 01:27:29 -08:00 committed by Linus Torvalds
parent 41cf54455d
commit 9f907c0144
1 changed files with 2 additions and 2 deletions
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4
include/linux/jiffies.h
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@ -142,13 +142,13 @@ static inline u64 get_jiffies_64(void)
*
* And some not so obvious.
*
* Note that we don't want to return MAX_LONG, because
* Note that we don't want to return LONG_MAX, because
* for various timeout reasons we often end up having
* to wait "jiffies+1" in order to guarantee that we wait
* at _least_ "jiffies" - so "jiffies+1" had better still
* be positive.
*/
#define MAX_JIFFY_OFFSET ((~0UL >> 1)-1)
#define MAX_JIFFY_OFFSET ((LONG_MAX >> 1)-1)
/*
* We want to do realistic conversions of time so we need to use the same