time: Move ktime_t overflow checking into timespec_valid_strict
authorJohn Stultz <john.stultz@linaro.org>
Fri, 31 Aug 2012 17:30:06 +0000 (13:30 -0400)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 1 Sep 2012 17:24:48 +0000 (10:24 -0700)
commitcee58483cf56e0ba355fdd97ff5e8925329aa936
tree8cc2dc979a93a48a07c25d309250a2271e508e21
parent7a611e69b26069a511d9d5251c6a28af6c521121
time: Move ktime_t overflow checking into timespec_valid_strict

Andreas Bombe reported that the added ktime_t overflow checking added to
timespec_valid in commit 4e8b14526ca7 ("time: Improve sanity checking of
timekeeping inputs") was causing problems with X.org because it caused
timeouts larger then KTIME_T to be invalid.

Previously, these large timeouts would be clamped to KTIME_MAX and would
never expire, which is valid.

This patch splits the ktime_t overflow checking into a new
timespec_valid_strict function, and converts the timekeeping codes
internal checking to use this more strict function.

Reported-and-tested-by: Andreas Bombe <aeb@debian.org>
Cc: Zhouping Liu <zliu@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/time.h
kernel/time/timekeeping.c