linux-kernel - Re: [PATCH 2/3] tools/vm/page-types: suppress gcc warnings

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Date:	Wed, 11 Nov 2015 21:46:23 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] tools/vm/page-types: suppress gcc warnings

On Thu, 12 Nov 2015, Sergey Senozhatsky wrote:

> > This can't possibly be correct, the warnings are legitimate and the result
> > of the sigsetjmp() in the function.  You may be interested in
> > returns_twice rather than marking random automatic variables as volatile.
> 
> Hm, ok. I saw no probs with `int first' and `end' being volatile
> 

This will only happen with the undocumented change in your first patch 
which adds -O2.

I don't know what version of gcc you're using, but only "first" and "end" 
being marked volatile isn't sufficient since mere code inspection would 
show that "off" will also be clobbered -- it's part of the loop.
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