: "cc");
}
+/* write_can_lock - would write_trylock() succeed? */
+#define __raw_write_can_lock(x) ((x)->lock == 0x80000000)
+
/*
* Read locks are a bit more hairy:
* - Exclusively load the lock value.
: "cc");
}
-#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
+static inline int __raw_read_trylock(raw_rwlock_t *rw)
+{
+ unsigned long tmp, tmp2 = 1;
+
+ __asm__ __volatile__(
+"1: ldrex %0, [%2]\n"
+" adds %0, %0, #1\n"
+" strexpl %1, %0, [%2]\n"
+ : "=&r" (tmp), "+r" (tmp2)
+ : "r" (&rw->lock)
+ : "cc");
+
+ smp_mb();
+ return tmp2 == 0;
+}
+
+/* read_can_lock - would read_trylock() succeed? */
+#define __raw_read_can_lock(x) ((x)->lock < 0x80000000)
+
+#define _raw_spin_relax(lock) cpu_relax()
+#define _raw_read_relax(lock) cpu_relax()
+#define _raw_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */