linux-kernel - Re: [PATCH -mm -v5] Separate atomic_t declaration from asm/atomic.h into asm/atomic

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Message-ID: <20081014184718.GG15064@parisc-linux.org>
Date:	Tue, 14 Oct 2008 12:47:19 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, ying.huang@...el.com,
	linux-kernel@...r.kernel.org, hpa@...or.com, tglx@...utronix.de
Subject: Re: [PATCH -mm -v5] Separate atomic_t declaration from asm/atomic.h into asm/atomic_def.h

On Fri, Oct 10, 2008 at 03:54:50PM -0700, Andrew Morton wrote:
> I have a note here that Matthew has proposed a different way of doing
> all this.  I don't immediately recall the details.
> 
> Can we get a refresh on all of that please?

I didn't remember either, but having just reviewed my inbox from August,
I said that all architectures basically use:

typedef struct { volatile int counter; } atomic_t;
#ifdef CONFIG_64BIT
typedef struct { volatile long counter; } atomic64_t;
#endif

and that should just be put in <linux/atomic_types.h>.

Roman Zippel did me one better and suggested just putting it in types.h,
which works for me.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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