Messages in this thread Patch in this message | | | Date | Fri, 29 Sep 2006 23:58:25 -0000 | From | Thomas Gleixner <> | Subject | [patch 06/23] time: fix timeout overflow |
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From: Ingo Molnar <mingo@elte.hu>
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> -- include/linux/jiffies.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
Index: linux-2.6.18-mm2/include/linux/jiffies.h =================================================================== --- linux-2.6.18-mm2.orig/include/linux/jiffies.h 2006-09-30 01:41:15.000000000 +0200 +++ linux-2.6.18-mm2/include/linux/jiffies.h 2006-09-30 01:41:16.000000000 +0200 @@ -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 --
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