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authorJohn Stultz <johnstul@us.ibm.com>2012-07-17 13:33:52 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-19 08:58:37 -0700
commit62b787f886e2d96cc7c5428aeee05dbe32a9531b (patch)
treeefde1d722f2151d394f693da0790afd16cf6dc1a /include/linux/atmppp.h
parentc7e2580578671c4d19a1a83e6fdb2482cc136283 (diff)
downloadlwn-62b787f886e2d96cc7c5428aeee05dbe32a9531b.tar.gz
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hrtimer: Provide clock_was_set_delayed()
This is a backport of f55a6faa384304c89cfef162768e88374d3312cb clock_was_set() cannot be called from hard interrupt context because it calls on_each_cpu(). For fixing the widely reported leap seconds issue it is necessary to call it from hard interrupt context, i.e. the timer tick code, which does the timekeeping updates. Provide a new function which denotes it in the hrtimer cpu base structure of the cpu on which it is called and raise the hrtimer softirq. We then execute the clock_was_set() notificiation from softirq context in run_hrtimer_softirq(). The hrtimer softirq is rarely used, so polling the flag there is not a performance issue. [ tglx: Made it depend on CONFIG_HIGH_RES_TIMERS. We really should get rid of all this ifdeffery ASAP ] Signed-off-by: John Stultz <johnstul@us.ibm.com> Reported-by: Jan Engelhardt <jengelh@inai.de> Reviewed-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Prarit Bhargava <prarit@redhat.com> Link: http://lkml.kernel.org/r/1341960205-56738-2-git-send-email-johnstul@us.ibm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/atmppp.h')
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