+#define ____down_write(sem, slow_path) \
+({ \
+ long tmp; \
+ struct rw_semaphore* ret = sem; \
+ asm volatile("# beginning down_write\n\t" \
+ LOCK_PREFIX " xadd %1,(%2)\n\t" \
+ /* adds 0xffff0001, returns the old value */ \
+ " test " __ASM_SEL(%w1,%k1) "," __ASM_SEL(%w1,%k1) "\n\t" \
+ /* was the active mask 0 before? */\
+ " jz 1f\n" \
+ " call " slow_path "\n" \
+ "1:\n" \
+ "# ending down_write" \
+ : "+m" (sem->count), "=d" (tmp), "+a" (ret) \
+ : "a" (sem), "1" (RWSEM_ACTIVE_WRITE_BIAS) \
+ : "memory", "cc"); \
+ ret; \
+})
+