AcoSail/kernel_optimize_test
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alpha: Change do_timer() to xtime_update()

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xtime_update() takes the xtime_lock itself.

timer_interrupt() is only called on the boot cpu. See do_entInt(). So
"state" in timer_interrupt does not require protection by xtime_lock.

Signed-off-by: Torben Hohn <torbenh@gmx.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: johnstul@us.ibm.com
Cc: hch@infradead.org
Cc: yong.zhang0@gmail.com
LKML-Reference: <20110127145915.23248.20919.stgit@localhost>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Torben Hohn 2011-01-27 15:59:15 +01:00 committed by Thomas Gleixner
parent f0af911a9d
commit 1340f3e0b2
1 changed files with 2 additions and 6 deletions
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8
arch/alpha/kernel/time.c
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@ -159,7 +159,7 @@ void read_persistent_clock(struct timespec *ts)
/* /*
* timer_interrupt() needs to keep up the real-time clock, * timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick * as well as call the "xtime_update()" routine every clocktick
*/ */
irqreturn_t timer_interrupt(int irq, void *dev) irqreturn_t timer_interrupt(int irq, void *dev)
{ {
@ -172,8 +172,6 @@ irqreturn_t timer_interrupt(int irq, void *dev)
profile_tick(CPU_PROFILING); profile_tick(CPU_PROFILING);
#endif #endif
write_seqlock(&xtime_lock);
/* /*
* Calculate how many ticks have passed since the last update, * Calculate how many ticks have passed since the last update,
* including any previous partial leftover. Save any resulting * including any previous partial leftover. Save any resulting
@ -187,9 +185,7 @@ irqreturn_t timer_interrupt(int irq, void *dev)
nticks = delta >> FIX_SHIFT; nticks = delta >> FIX_SHIFT;
if (nticks) if (nticks)
do_timer(nticks); xtime_update(nticks);
write_sequnlock(&xtime_lock);
if (test_irq_work_pending()) { if (test_irq_work_pending()) {
clear_irq_work_pending(); clear_irq_work_pending();