Messages in this thread | | | Date | Fri, 2 Mar 2007 14:04:33 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] timer/hrtimer: take per cpu locks in sane order |
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* Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
> - spin_lock(&new_base->lock); > - spin_lock(&old_base->lock); > + /* > + * If we take a lock from a different cpu, make sure we have always > + * the same locking order. That is the lock that belongs to the cpu > + * with the lowest number is taken first. > + */ > + lock1 = smp_processor_id() < cpu ? &new_base->lock : &old_base->lock; > + lock2 = smp_processor_id() < cpu ? &old_base->lock : &new_base->lock; > + spin_lock(lock1); > + spin_lock(lock2);
looks good to me. Wouldnt this be cleaner via double_lock_timer() - similar to how double_rq_lock() works in kernel/sched.c - instead of open-coding it?
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