Messages in this thread Patch in this message | | | Date | Tue, 23 Jan 2007 22:01:01 -0000 | From | Thomas Gleixner <> | Subject | [patch 06/46] Fix timeout overflow with jiffies |
| |
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> Signed-off-by: Andrew Morton <akpm@osdl.org> ---
include/linux/jiffies.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
Index: linux-2.6.20-rc4-mm1-bo/include/linux/jiffies.h =================================================================== --- linux-2.6.20-rc4-mm1-bo.orig/include/linux/jiffies.h +++ linux-2.6.20-rc4-mm1-bo/include/linux/jiffies.h @@ -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 --
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |