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authorThomas Gleixner <tglx@linutronix.de>2012-07-10 18:43:24 -0400
committerThomas Gleixner <tglx@linutronix.de>2012-07-11 23:34:39 +0200
commitf6c06abfb3972ad4914cef57d8348fcb2932bc3b (patch)
tree5882f90d98d0429b30d0f7f7d35c14f6e0a5125a /kernel/hrtimer.c
parent196951e91262fccda81147d2bcf7fdab08668b40 (diff)
downloadlinux-f6c06abfb3972ad4914cef57d8348fcb2932bc3b.tar.gz
timekeeping: Provide hrtimer update function
To finally fix the infamous leap second issue and other race windows caused by functions which change the offsets between the various time bases (CLOCK_MONOTONIC, CLOCK_REALTIME and CLOCK_BOOTTIME) we need a function which atomically gets the current monotonic time and updates the offsets of CLOCK_REALTIME and CLOCK_BOOTTIME with minimalistic overhead. The previous patch which provides ktime_t offsets allows us to make this function almost as cheap as ktime_get() which is going to be replaced in hrtimer_interrupt(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Prarit Bhargava <prarit@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: John Stultz <johnstul@us.ibm.com> Link: http://lkml.kernel.org/r/1341960205-56738-7-git-send-email-johnstul@us.ibm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/hrtimer.c')
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