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

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Message-ID: <20070822213800.GJ30705@stusta.de>
Date:	Wed, 22 Aug 2007 23:38:00 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Valdis.Kletnieks@...edu
Cc:	paulmck@...ux.vnet.ibm.com,
	Segher Boessenkool <segher@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Christoph Lameter <clameter@....com>,
	heiko.carstens@...ibm.com, horms@...ge.net.au,
	linux-kernel@...r.kernel.org, ak@...e.de, netdev@...r.kernel.org,
	cfriesen@...tel.com, akpm@...ux-foundation.org,
	rpjday@...dspring.com, Nick Piggin <nickpiggin@...oo.com.au>,
	linux-arch@...r.kernel.org, jesper.juhl@...il.com,
	satyam@...radead.org, zlynx@....org, schwidefsky@...ibm.com,
	Chris Snook <csnook@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>, 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

On Tue, Aug 21, 2007 at 06:51:16PM -0400, Valdis.Kletnieks@...edu wrote:
> On Tue, 21 Aug 2007 09:16:43 PDT, "Paul E. McKenney" said:
> 
> > I agree that instant gratification is hard to come by when synching
> > up compiler and kernel versions.  Nonetheless, it should be possible
> > to create APIs that are are conditioned on the compiler version.
> 
> We've tried that, sort of.  See the mess surrounding the whole
> extern/static/inline/__whatever boondogle, which seems to have
> changed semantics in every single gcc release since 2.95 or so.
>...

There is exactly one semantics change in gcc in this area, and that is 
the change of the "extern inline" semantics in gcc 4.3 to the
C99 semantics.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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