linux-kernel - Re: [PATCH] x86/mm: fix regression with huge pages on PAE

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Date:	Thu, 12 Nov 2015 09:55:27 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Borislav Petkov <bp@...en8.de>, hpa@...or.com,
	tglx@...utronix.de, mingo@...hat.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	jgross@...e.com, konrad.wilk@...cle.com, elliott@....com,
	boris.ostrovsky@...cle.com, Toshi Kani <toshi.kani@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86/mm: fix regression with huge pages on PAE


* Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:

> > But, what problems do you expect with having a wider mask than its primary usage? 
> > If it's used for 32-bit values it will be truncated down safely. (But I have not 
> > tested it, so I might be missing some complication.)
> 
> Yeah, I basically worry about non realized side effect.

Such a worry is prudent, the best way would be to double check a disassembly of a 
before/after vmlinux and see in which functions they differ and why.

We might have similar bugs elsewhere - silently fixed by such a change.

Thanks,

	Ingo
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