From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 16 Feb 2007 09:27:28 +0000 (-0800)
Subject: [PATCH] Fix multiple conversion bugs in msecs_to_jiffies
X-Git-Tag: v2.6.21-rc1~159
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41cf54455da5e5dc847a9733d49ca23b5e7dd59e;p=pandora-kernel.git

[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>
---

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