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Suresh Siddha f833bab87f clockevent: Prevent dead lock on clockevents_lock ... Currently clockevents_notify() is called with interrupts enabled at some places and interrupts disabled at some other places. This results in a deadlock in this scenario. cpu A holds clockevents_lock in clockevents_notify() with irqs enabled cpu B waits for clockevents_lock in clockevents_notify() with irqs disabled cpu C doing set_mtrr() which will try to rendezvous of all the cpus. This will result in C and A come to the rendezvous point and waiting for B. B is stuck forever waiting for the spinlock and thus not reaching the rendezvous point. Fix the clockevents code so that clockevents_lock is taken with interrupts disabled and thus avoid the above deadlock. Also call lapic_timer_propagate_broadcast() on the destination cpu so that we avoid calling smp_call_function() in the clockevents notifier chain. This issue left us wondering if we need to change the MTRR rendezvous logic to use stop machine logic (instead of smp_call_function) or add a check in spinlock debug code to see if there are other spinlocks which gets taken under both interrupts enabled/disabled conditions. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: "Pallipadi Venkatesh" <venkatesh.pallipadi@intel.com> Cc: "Brown Len" <len.brown@intel.com> LKML-Reference: <1250544899.2709.210.camel@sbs-t61.sc.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		16 years ago
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Kconfig	Kconfig: eliminate "def_bool n" constructs	17 years ago
Makefile	timecompare: generic infrastructure to map between two time bases	16 years ago
clockevents.c	clockevent: Prevent dead lock on clockevents_lock	16 years ago
clocksource.c	clocksource: Prevent NULL pointer dereference	16 years ago
jiffies.c	clocksource: pass clocksource to read() callback	16 years ago
ntp.c	time: ntp: fix bug in ntp_update_offset() & do_adjtimex(), fix	16 years ago
tick-broadcast.c	clockevent: Prevent dead lock on clockevents_lock	16 years ago
tick-common.c	clockevents: prevent endless loop in tick_handle_periodic()	16 years ago
tick-internal.h	NOHZ: restart tick device from irq_enter()	17 years ago
tick-oneshot.c	clocksource: prevent selection of low resolution clocksourse also for nohz=on	16 years ago
tick-sched.c	Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
timecompare.c	timecompare: generic infrastructure to map between two time bases	16 years ago
timekeeping.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	16 years ago
timer_list.c	timers: Drop write permission on /proc/timer_list	16 years ago
timer_stats.c	timer stats: Optimize by adding quick check to avoid function calls	16 years ago