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

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Message-Id: <2d2eeab6276cab2e6cc5830d36a43b98@kernel.crashing.org>
Date:	Wed, 15 Aug 2007 22:47:07 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	horms@...ge.net.au, Stefan Richter <stefanr@...6.in-berlin.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, ak@...e.de,
	netdev@...r.kernel.org, cfriesen@...tel.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	rpjday@...dspring.com, jesper.juhl@...il.com,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, zlynx@....org,
	clameter@....com, 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

>>> What you probably mean is that the compiler has to assume any code
>>> it cannot currently see can do anything (insofar as allowed by the
>>> relevant standards etc.)
>
> I think this was just terminology confusion here again. Isn't "any code
> that it cannot currently see" the same as "another compilation unit",

It is not; try  gcc -combine  or the upcoming link-time optimisation
stuff, for example.

> and wouldn't the "compilation unit" itself expand if we ask gcc to
> compile more than one unit at once? Or is there some more specific
> "definition" for "compilation unit" (in gcc lingo, possibly?)

"compilation unit" is a C standard term.  It typically boils down
to "single .c file".


Segher

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