On Thursday 24 August 2006 13:04, Suleiman Souhlal wrote:
> Andi Kleen wrote:
> > Edward Falk <[email protected]> writes:
> >
> >
> >>Add spin_lock_string_flags and _raw_spin_lock_flags() to
> >>asm-x86_64/spinlock.h so that _spin_lock_irqsave() has the same
> >>semantics on x86_64 as it does on i386 and does *not* have interrupts
> >>disabled while it is waiting for the lock.
> >
> >
> > Did it fix anything for you?
>
> I think this was to work around the fact that some buggy drivers try to
> grab spinlocks without disabling interrupts when they should, which
> would cause deadlocks when trying to rendez-vous every cpu via IPIs.
That doesn't help them at all because they could then deadlock later.
In theory it is just a quite cheesy way to make lock contended code
work a little better, but I was not aware of it actually helping
in practice.
-Andi
>
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