linux-kernel - Re: [PATCH v2 2/2] hugetlb: Provide safer dummy values for HPAGE_MASK and HPAGE

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Date:	Fri, 18 Nov 2011 12:56:17 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	David Daney <ddaney.cavm@...il.com>
CC:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v2 2/2] hugetlb: Provide safer dummy values for HPAGE_MASK
 and HPAGE_SIZE

Hello.

On 18-11-2011 1:57, David Daney wrote:

> From: David Daney<david.daney@...ium.com>

> It was pointed out by David Rientjes that the dummy values for
> HPAGE_MASK and HPAGE_SIZE are quite unsafe.  It they are inadvertently
> used with !CONFIG_HUGETLB_PAGE, compilation would succeed, but the
> resulting code would surly not do anything sensible.
>
> Place BUG() in the these dummy definitions, as we do in similar
> circumstances in other places, so any abuse can be easily detected.
>
> Since the only sane place to use these symbols when
> !CONFIG_HUGETLB_PAGE is on dead code paths, the BUG() cause any actual
> code to be emitted by the compiler.

    You mean "doesn't cause"?

> Cc: David Rientjes<rientjes@...gle.com>
> Signed-off-by: David Daney<david.daney@...ium.com>

WBR, Sergei

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