Re: [PATCH 1/2] FRV: Implement atomic64_t

[David Howells <dhowells@redhat.com>]

Linus Torvalds <torvalds@linux-foundation.org> wrote:

> > +#define atomic64_read(v)	((v)->counter)
> > +#define atomic64_set(v, i)	(((v)->counter) = (i))

This is now:

	static inline long long atomic64_read(atomic64_t *v)
	{
		long long counter;

		asm("ldd%I1 %M1,%0"
		    : "=e"(counter)
		    : "m"(v->counter));
		return counter;
	}

	static inline void atomic64_set(atomic64_t *v, long long i)
	{
		asm volatile("std%I0 %1,%M0"
			     : "=m"(v->counter)
			     : "e"(i));
	}

which causes the CPU to do 64-bit loads and stores to register pairs.

David