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authorThomas Gleixner <tglx@linutronix.de>2008-10-21 20:17:35 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-10-21 20:53:24 +0200
commitc4bd822e7b12a9008241d76db45b665f2fef180c (patch)
treebd4b7b4e2e7db065c971eb264196f02e0b01ecff /kernel/sys.c
parent2515ddc6db8eb49a79f0fe5e67ff09ac7c81eab4 (diff)
NOHZ: fix thinko in the timer restart code path
commit fb02fbc14d17837b4b7b02dbb36142c16a7bf208 (NOHZ: restart tick device from irq_enter()) solves the problem of stale jiffies when long running softirqs happen in a long idle sleep period, but it has a major thinko in it: When the interrupt which came in _is_ the timer interrupt which should expire ts->sched_timer then we cancel and rearm the timer _before_ it gets expired in hrtimer_interrupt() to the next period. That means the call back function is not called. This game can go on for ever :( Prevent this by making sure to only rearm the timer when the expiry time is more than one tick_period away. Otherwise keep it running as it is either already expired or will expiry at the right point to update jiffies. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Venkatesch Pallipadi <venkatesh.pallipadi@intel.com>
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