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authorJeremy Fitzhardinge <jeremy@goop.org>2008-08-20 00:19:36 +0400
committerIngo Molnar <mingo@elte.hu>2008-08-20 14:40:07 +0400
commit63d3a75d6f1fcf2f33e6abbe84e1f428c3586152 (patch)
tree3b7453c784b4fad0afe002942d48bfc876010999 /arch/x86/kernel/paravirt-spinlocks.c
parent6e833587e11ed0dbf12e647127f2650e2f80b26d (diff)
downloadlinux-63d3a75d6f1fcf2f33e6abbe84e1f428c3586152.tar.xz
x86/paravirt: add spin_lock_flags lock op
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>
Diffstat (limited to 'arch/x86/kernel/paravirt-spinlocks.c')
-rw-r--r--arch/x86/kernel/paravirt-spinlocks.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/paravirt-spinlocks.c b/arch/x86/kernel/paravirt-spinlocks.c
index 38d7f7f1dbc9..206359a8e43f 100644
--- a/arch/x86/kernel/paravirt-spinlocks.c
+++ b/arch/x86/kernel/paravirt-spinlocks.c
@@ -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