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

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Date:	Wed, 15 Aug 2007 22:52:53 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	horms@...ge.net.au, Stefan Richter <stefanr@...6.in-berlin.de>,
	Satyam Sharma <satyam@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rpjday@...dspring.com, netdev@...r.kernel.org, ak@...e.de,
	cfriesen@...tel.com, Heiko Carstens <heiko.carstens@...ibm.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

>> I think this was just terminology confusion here again. Isn't "any 
>> code
>> that it cannot currently see" the same as "another compilation unit",
>> 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?)
>
> This is indeed my understanding -- "compilation unit" is whatever the
> compiler looks at in one go.  I have heard the word "module" used for
> the minimal compilation unit covering a single .c file and everything
> that it #includes, but there might be a better name for this.

Yes, that's what's called "compilation unit" :-)

[/me double checks]

Erm, the C standard actually calls it "translation unit".

To be exact, to avoid any more confusion:

5.1.1.1/1:
A C program need not all be translated at the same time. The
text of the program is kept in units called source files, (or
preprocessing files) in this International Standard. A source
file together with all the headers and source files included
via the preprocessing directive #include is known as a
preprocessing translation unit. After preprocessing, a
preprocessing translation unit is called a translation unit.



Segher

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