#ifndef _ASM_SPINLOCK_H
#define _ASM_SPINLOCK_H
-#include <linux/config.h>
#include <asm/war.h>
/*
* Your basic SMP spinlocks, allowing only a single CPU anywhere
*/
-#define __raw_spin_is_locked(x) ((x)->lock != 0)
+#define __raw_spin_is_locked(x) ((x)->lock != 0)
#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
#define __raw_spin_unlock_wait(x) \
- do { cpu_relax(); } while ((x)->lock)
+ do { cpu_relax(); } while ((x)->lock)
/*
* Simple spin lock operations. There are two variants, one clears IRQ's
* read-locks.
*/
+/*
+ * read_can_lock - would read_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define __raw_read_can_lock(rw) ((rw)->lock >= 0)
+
+/*
+ * write_can_lock - would write_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define __raw_write_can_lock(rw) (!(rw)->lock)
+
static inline void __raw_read_lock(raw_rwlock_t *rw)
{
unsigned int tmp;
" lui %1, 0x8000 \n"
" sc %1, %0 \n"
" beqzl %1, 1b \n"
- " nop \n"
- " sync \n"
+ " sync \n"
" .set reorder \n"
: "=m" (rw->lock), "=&r" (tmp)
: "m" (rw->lock)
" lui %1, 0x8000 \n"
" sc %1, %0 \n"
" beqz %1, 1b \n"
- " nop \n"
- " sync \n"
+ " sync \n"
" .set reorder \n"
: "=m" (rw->lock), "=&r" (tmp)
: "m" (rw->lock)
" lui %1, 0x8000 \n"
" sc %1, %0 \n"
" beqzl %1, 1b \n"
- " nop \n"
- " sync \n"
+ " sync \n"
" li %2, 1 \n"
" .set reorder \n"
"2: \n"