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

From: David Rientjes
Date: Thu Nov 12 2015 - 00:46:30 EST

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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