#define spin_is_locked(x) (*(volatile signed char *)(&(x)->lock) <= 0)
#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x))
-#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
#define spin_lock_string \
"\n1:\t" \
"lock ; decb %0\n\t" \
- "js 2f\n" \
- LOCK_SECTION_START("") \
+ "jns 3f\n" \
"2:\t" \
"rep;nop\n\t" \
"cmpb $0,%0\n\t" \
"jle 2b\n\t" \
"jmp 1b\n" \
- LOCK_SECTION_END
+ "3:\n\t"
+
+#define spin_lock_string_flags \
+ "\n1:\t" \
+ "lock ; decb %0\n\t" \
+ "jns 4f\n\t" \
+ "2:\t" \
+ "testl $0x200, %1\n\t" \
+ "jz 3f\n\t" \
+ "sti\n\t" \
+ "3:\t" \
+ "rep;nop\n\t" \
+ "cmpb $0, %0\n\t" \
+ "jle 3b\n\t" \
+ "cli\n\t" \
+ "jmp 1b\n" \
+ "4:\n\t"
/*
* This works. Despite all the confusion.
static inline void _raw_spin_lock(spinlock_t *lock)
{
#ifdef CONFIG_DEBUG_SPINLOCK
- __label__ here;
-here:
if (unlikely(lock->magic != SPINLOCK_MAGIC)) {
- printk("eip: %p\n", &&here);
+ printk("eip: %p\n", __builtin_return_address(0));
BUG();
}
#endif
:"=m" (lock->lock) : : "memory");
}
+static inline void _raw_spin_lock_flags (spinlock_t *lock, unsigned long flags)
+{
+#ifdef CONFIG_DEBUG_SPINLOCK
+ if (unlikely(lock->magic != SPINLOCK_MAGIC)) {
+ printk("eip: %p\n", __builtin_return_address(0));
+ BUG();
+ }
+#endif
+ __asm__ __volatile__(
+ spin_lock_string_flags
+ :"=m" (lock->lock) : "r" (flags) : "memory");
+}
/*
* Read-write spinlocks, allowing multiple readers