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

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Message-ID: <20090703112642.GA14744@elte.hu>
Date:	Fri, 3 Jul 2009 13:26:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>, akpm@...ux-foundation.org,
	paulus@...ba.org, arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] FRV: Implement atomic64_t


* Ingo Molnar <mingo@...e.hu> wrote:

> Good point. I've done a simple:
> 
> u64 atomic64_read(atomic64_t *ptr)
> {
>         return cmpxchg8b(ptr, 0, 0);
> }

-1 is better i guess, as that way we can avoid dirtying the 
cacheline. Zero is way too common for atomics.

	Ingo
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