time: Move ktime_t overflow checking into timespec_valid_strict
authorJohn Stultz <john.stultz@linaro.org>
Tue, 11 Sep 2012 19:04:19 +0000 (15:04 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 2 Oct 2012 17:30:36 +0000 (10:30 -0700)
commit9a227fcb842a03fce5b8a6da0da40f5601ec6908
treed186f0f90e021d9fc9a35ab009cdcab3e315c8a2
parent80257cbe62ea0919153c43421746269ab68473bf
time: Move ktime_t overflow checking into timespec_valid_strict

commit cee58483cf56e0ba355fdd97ff5e8925329aa936 upstream

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>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
include/linux/time.h
kernel/time/timekeeping.c