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

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Message-Id: <899db25b292a84560e5cc955ebe4c9e1@kernel.crashing.org>
Date:	Sat, 18 Aug 2007 01:55:55 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Paul Mackerras <paulus@...ba.org>, heiko.carstens@...ibm.com,
	horms@...ge.net.au,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rpjday@...dspring.com, ak@...e.de, netdev@...r.kernel.org,
	cfriesen@...tel.com, Nick Piggin <nickpiggin@...oo.com.au>,
	linux-arch@...r.kernel.org, jesper.juhl@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>, zlynx@....org,
	clameter@....com, schwidefsky@...ibm.com,
	Chris Snook <csnook@...hat.com>,
	Herbert Xu <herbert.xu@...hat.com>, davem@...emloft.net,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	wensong@...ux-vs.org, wjiang@...ilience.com
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

>>> #define forget(a)	__asm__ __volatile__ ("" :"=m" (a) :"m" (a))
>>>
>>> [ This is exactly equivalent to using "+m" in the constraints, as 
>>> recently
>>>   explained on a GCC list somewhere, in response to the patch in my 
>>> bitops
>>>   series a few weeks back where I thought "+m" was bogus. ]
>>
>> [It wasn't explained on a GCC list in response to your patch, as
>> far as I can see -- if I missed it, please point me to an archived
>> version of it].
>
> http://gcc.gnu.org/ml/gcc-patches/2007-07/msg01758.html

Ah yes, that old thread, thank you.

> That's when _I_ came to know how GCC interprets "+m", but probably
> this has been explained on those lists multiple times. Who cares,
> anyway?

I just couldn't find the thread you meant, I thought I missed
have it, that's all :-)


Segher

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