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/* { dg-do compile { target i?86-*-* x86_64-*-* } } */

/* { dg-options -O2 } */

extern __inline__ int test_and_set_bit(int nr, volatile void * addr)

{

        int oldbit;

        __asm__ __volatile__( ""

                "btsl %2,%1\n\tsbbl %0,%0"

                :"=r" (oldbit),"=m" (addr)

                :"ir" (nr));

        return oldbit;

}

struct buffer_head {

        unsigned long b_state;

};

extern void lock_buffer(struct buffer_head * bh)

{

        while (test_and_set_bit(2 , &bh->b_state))

                __wait_on_buffer(bh);

}