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x86/paravirt: add spin_lock_flags lock op

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It is useful for a pv_lock_ops backend to know whether interrupts are
enabled or not in the context a spin_lock is being called.  This
allows it to enable interrupts while spinning, which could be
particularly helpful when spinning becomes blocking.

The default implementation just calls the normal spin_lock op,
ignoring the flags.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-08-19 13:19:36 -07:00
committed by Ingo Molnar
parent 6e833587e1
commit 63d3a75d6f
3 changed files with 20 additions and 2 deletions
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6
arch/x86/kernel/paravirt-spinlocks.c
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@@ -7,12 +7,18 @@
#include <asm/paravirt.h>
static void default_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags)
{
__raw_spin_lock(lock);
}
struct pv_lock_ops pv_lock_ops = {
#ifdef CONFIG_SMP
.spin_is_locked = __ticket_spin_is_locked,
.spin_is_contended = __ticket_spin_is_contended,
.spin_lock = __ticket_spin_lock,
.spin_lock_flags = default_spin_lock_flags,
.spin_trylock = __ticket_spin_trylock,
.spin_unlock = __ticket_spin_unlock,
#endif