Implement interrupt enabling while spinning for lock for spin_lock_irq
Signed-off by: Pravin B. Shelar <[email protected]>
Signed-off by: Ravikiran Thirumalai <[email protected]>
Signed-off by: Shai Fultheim <[email protected]>
Index: linux-2.6.20-rc1/include/asm-x86_64/spinlock.h
===================================================================
--- linux-2.6.20-rc1.orig/include/asm-x86_64/spinlock.h 2006-12-28 17:18:32.142775000 -0800
+++ linux-2.6.20-rc1/include/asm-x86_64/spinlock.h 2006-12-29 14:05:04.012954000 -0800
@@ -63,7 +63,21 @@ static inline void __raw_spin_lock_flags
"5:\n\t"
: "+m" (lock->slock) : "r" ((unsigned)flags) : "memory");
}
-#define __raw_spin_lock_irq(lock) __raw_spin_lock(lock)
+static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
+{
+ asm volatile(
+ "\n1:\t"
+ LOCK_PREFIX " ; decl %0\n\t"
+ "jns 2f\n"
+ "sti\n" /* Enable interrupts during spin */
+ "3:\n"
+ "rep;nop\n\t"
+ "cmpl $0,%0\n\t"
+ "jle 3b\n\t"
+ "cli\n"
+ "jmp 1b\n"
+ "2:\t" : "+m" (lock->slock) : : "memory");
+}
#endif
static inline int __raw_spin_trylock(raw_spinlock_t *lock)
-
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