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authorIngo Molnar <mingo@elte.hu>2007-02-16 01:27:29 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:13:56 -0800
commit9f907c0144496e464bd5ed5a99a51227d63a9c0b (patch)
tree84adb214bab37327d4806ca5d0b91c3ba24c73ad
parent41cf54455da5e5dc847a9733d49ca23b5e7dd59e (diff)
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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>
-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)
*
* 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