rwsem_count_t tmp;
asm volatile("# beginning __up_write\n\t"
LOCK_PREFIX " xadd %1,(%2)\n\t"
- /* tries to transition
- 0xffff0001 -> 0x00000000 */
- " jz 1f\n"
+ /* subtracts 0xffff0001, returns the old value */
+ " jns 1f\n\t"
" call call_rwsem_wake\n"
"1:\n\t"
"# ending __up_write\n"