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authorJeremy Fitzhardinge <jeremy@goop.org>2008-08-19 16:19:36 -0400
committerIngo Molnar <mingo@elte.hu>2008-08-20 06:40:07 -0400
commit63d3a75d6f1fcf2f33e6abbe84e1f428c3586152 (patch)
tree3b7453c784b4fad0afe002942d48bfc876010999 /include/asm-x86/spinlock.h
parent6e833587e11ed0dbf12e647127f2650e2f80b26d (diff)
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 'include/asm-x86/spinlock.h')
-rw-r--r--include/asm-x86/spinlock.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-x86/spinlock.h b/include/asm-x86/spinlock.h
index e39c790dbfd2..b755ea86367e 100644
--- a/include/asm-x86/spinlock.h
+++ b/include/asm-x86/spinlock.h
@@ -182,8 +182,6 @@ static __always_inline void __ticket_spin_unlock(raw_spinlock_t *lock)
182} 182}
183#endif 183#endif
184 184
185#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
186
187#ifdef CONFIG_PARAVIRT 185#ifdef CONFIG_PARAVIRT
188/* 186/*
189 * Define virtualization-friendly old-style lock byte lock, for use in 187 * Define virtualization-friendly old-style lock byte lock, for use in
@@ -272,6 +270,13 @@ static __always_inline void __raw_spin_unlock(raw_spinlock_t *lock)
272{ 270{
273 __ticket_spin_unlock(lock); 271 __ticket_spin_unlock(lock);
274} 272}
273
274static __always_inline void __raw_spin_lock_flags(raw_spinlock_t *lock,
275 unsigned long flags)
276{
277 __raw_spin_lock(lock);
278}
279
275#endif /* CONFIG_PARAVIRT */ 280#endif /* CONFIG_PARAVIRT */
276 281
277static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock) 282static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)