linux-kernel - Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

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Message-Id: <200708091730.19024.arnd@arndb.de>
Date:	Thu, 9 Aug 2007 17:30:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Chris Snook <csnook@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	torvalds@...ux-foundation.org, netdev@...r.kernel.org,
	akpm@...ux-foundation.org, ak@...e.de, heiko.carstens@...ibm.com,
	davem@...emloft.net, schwidefsky@...ibm.com, wensong@...ux-vs.org,
	horms@...ge.net.au, wjiang@...ilience.com, cfriesen@...tel.com,
	zlynx@....org, rpjday@...dspring.com, jesper.juhl@...il.com
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

On Thursday 09 August 2007, Chris Snook wrote:
> a) chicken and egg: asm-generic/atomic.h depends on definitions in asm/atomic.h

Ok, I see.
 
> If you can find a way to reshuffle the code and make it simpler, I personally am 
> all for it. I'm skeptical that you'll get much to show for the effort. 

I guess it could  be done using more macros or new headers, but I don't see
a way that would actually improve the situation.

> b) The definitions aren't precisely identical between all architectures, so it 
> would be a mess of special cases, which gets us right back to where we are now.

Why are they not identical? Anything beyond the 32/64 bit difference should
be the same afaics, or it might cause more bugs.

	Arnd <><
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