linux-kernel - Re: [PATCH] make atomic_t volatile on all architectures

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Message-Id: <74868f39491f8691afc5540f72679129@kernel.crashing.org>
Date:	Sun, 12 Aug 2007 18:30:32 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	schwidefsky@...ibm.com
Cc:	wjiang@...ilience.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	wensong@...ux-vs.org, heiko.carstens@...ibm.com,
	linux-kernel@...r.kernel.org, ak@...e.de, cfriesen@...tel.com,
	netdev@...r.kernel.org, horms@...ge.net.au,
	akpm@...ux-foundation.org, Chuck Ebbert <cebbert@...hat.com>,
	davem@...emloft.net, zlynx@....org, Chris Snook <csnook@...hat.com>
Subject: Re: [PATCH] make atomic_t volatile on all architectures

>> "+m" works. We use it. It's better than the alternatives. Pointing to
>> stale documentation doesn't change anything.
>
> Well, perhaps on i386. I've seen some older versions of the s390 gcc 
> die
> with an ICE because I have used "+m" in some kernel inline assembly. 
> I'm
> happy to hear that this issue is fixed in recent gcc. Now I'll have to
> find out if this is already true with gcc 3.x.

It was fixed (that is, "+m" is translated into a separate read
and write by GCC itself) in GCC-4.0.0, I just learnt.

> The duplication "=m" and "m" with the same constraint is rather 
> annoying.

Yeah.  Compiler errors are more annoying though I dare say ;-)


Segher

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