linux-kernel - Re: [PATCH 1/2] FRV: Implement atomic64

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Date:	Thu, 02 Jul 2009 00:48:38 +0100
From:	David Howells <dhowells@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	dhowells@...hat.com, mingo@...e.hu, akpm@...ux-foundation.org,
	paulus@...ba.org, arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] FRV: Implement atomic64_t

Linus Torvalds <torvalds@...ux-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
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