problem w/ GCC asm stmt on sparc

David S. Miller davem@jenolan.rutgers.edu
Tue Jun 24 14:13:00 GMT 1997


A more efficient (and working ;-) sequence would be:

int spin_trylock(spinlock_t *lock)
{
	unsigned int result;
	__asm__ __volatile__("ldstub [%1], %0"
			     : "=r" (result)
			     : "r" (lock)
			     : "memory");
	return (result == 0);
}

I know that works because I have been using it in the Linux kernel for
some time now on SMP ;-)

Later,
David "Sparc" Miller
davem@caip.rutgers.edu



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