1 /* { dg-do compile { target i?86-*-* } } */ 2 /* { dg-options -O2 } */ 3 4 extern __inline__ int test_and_set_bit(int nr, volatile void * addr) 5 { 6 int oldbit; 7 __asm__ __volatile__( "" 8 "btsl %2,%1\n\tsbbl %0,%0" 9 :"=r" (oldbit),"=m" (addr) 10 :"ir" (nr)); 11 return oldbit; 12 } 13 struct buffer_head { 14 unsigned long b_state; 15 }; 16 extern void lock_buffer(struct buffer_head * bh) 17 { 18 while (test_and_set_bit(2 , &bh->b_state)) 19 __wait_on_buffer(bh); 20 } 21