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

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Date:	Wed, 15 Aug 2007 23:07:47 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Christoph Lameter <clameter@....com>, heiko.carstens@...ibm.com,
	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, 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

>> Possibly these were too trivial to expose any potential problems that 
>> you
>> may have been referring to, so would be helpful if you could write a 
>> more
>> concrete example / sample code.
>
> The trick is to have a sufficiently complicated expression to force
> the compiler to run out of registers.

You can use -ffixed-XXX to keep the testcase simple.


Segher

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