On Wed, 2008-10-22 at 13:05 -0600, Matthew Wilcox wrote: > On Wed, Oct 22, 2008 at 07:24:31PM +0200, Peter Zijlstra wrote: > > > No problem. I could then also use it for _spin_lock_irqsave, if the > > > answer to the above question is use CONFIG_LOCK_STAT there as well. > > > > If you create LOCK_CONTEDED_FLAGS() the whole issue goes away nicely. Gah, I looked at it again, and that #ifdef isn't only to select between LOCK_CONTENDED and not, but we can't actually have the re-enable for anything lockdep. So I was wrong. > Should it also be used for _spin_lock_irq()? I'm puzzled why it's only > used for _irqsave(). Right, not sure how this maze is done. The thing is, with spin_lock_irq() you know the irq state and can do the enable unconditionally - then again, with ticket locks we cannot do it at all. The _flags() version needs the flags to see if irqs was enabled before we entered the op, if it wasn't we cannot go around enabling them. > (should _spin_lock_bh() re-enable BHs while waiting? Is it just not big > enough of a deal?) Doubt it.. dunno.. personally I'd rather see softirqs die sooner rather than later. -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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