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[PATCH] Fix timeout overflow with jiffies

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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