tree ea7aa5fe473f4716e4190f7a90a7663535fee312
parent 8b9365d753d9870bb6451504c13570b81923228f
author Ingo Molnar <mingo@elte.hu> 1171618048 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1171642436 -0800

[PATCH] Fix multiple conversion bugs in msecs_to_jiffies

Fix multiple conversion bugs in msecs_to_jiffies().

The main problem is that this condition:

	if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))

overflows if HZ is smaller than 1000!

This change is user-visible: for HZ=250 SUS-compliant poll()-timeout
value of -20 is mistakenly converted to 'immediate timeout'.

(The new dyntick code also triggered this, that's how we noticed.)

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>