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.
It's a bad idea to spin with interrupts disabled when they could very
well be enabled, anyway.
-- Suleiman
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