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Date:	Sat, 18 Aug 2007 20:12:48 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Segher Boessenkool <segher@...nel.crashing.org>
cc:	Christoph Lameter <clameter@....com>, heiko.carstens@...ibm.com,
	horms@...ge.net.au, Stefan Richter <stefanr@...6.in-berlin.de>,
	Bill Fink <billfink@...dspring.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, ak@...e.de, cfriesen@...tel.com,
	rpjday@...dspring.com, jesper.juhl@...il.com,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.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 Sat, 18 Aug 2007, Segher Boessenkool wrote:

> > > GCC manual, section 6.1, "When
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > is a Volatile Object Accessed?" doesn't say anything of the
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > kind.
      ^^^^^

> > True, "implementation-defined" as per the C standard _is_ supposed to mean
    ^^^^^

> > "unspecified behaviour where each implementation documents how the choice
> > is made". So ok, probably GCC isn't "documenting" this
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

> > implementation-defined behaviour which it is supposed to, but can't really
> > fault them much for this, probably.
> 
> GCC _is_ documenting this, namely in this section 6.1.

(Again totally petty, but) Yes, but ...

> It doesn't
  ^^^^^^^^^^
> mention volatile-casted stuff.  Draw your own conclusions.
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

... exactly. So that's why I said "GCC isn't documenting _this_".

Man, try _reading_ mails before replying to them ...
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