From: Sergei Shtylyov <sshtylyov@mvista.com>
To: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org, ralf@linux-mips.org,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
David Daney <david.daney@cavium.com>,
David Rientjes <rientjes@google.com>
Subject: Re: [PATCH v2 2/2] hugetlb: Provide safer dummy values for HPAGE_MASK and HPAGE_SIZE
Date: Fri, 18 Nov 2011 12:56:17 +0400 [thread overview]
Message-ID: <4EC61DB1.3090608@mvista.com> (raw)
In-Reply-To: <1321567050-13197-3-git-send-email-ddaney.cavm@gmail.com>
Hello.
On 18-11-2011 1:57, David Daney wrote:
> From: David Daney<david.daney@cavium.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@google.com>
> Signed-off-by: David Daney<david.daney@cavium.com>
WBR, Sergei
next prev parent reply other threads:[~2011-11-18 8:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-17 21:57 [PATCH v2 0/2] Dummy HPAGE_* constants for !CONFIG_HUGETLB_PAGE David Daney
2011-11-17 21:57 ` [PATCH v2 1/2] hugetlb: Provide a default HPAGE_SHIFT if !CONFIG_HUGETLB_PAGE David Daney
2011-11-17 21:57 ` [PATCH v2 2/2] hugetlb: Provide safer dummy values for HPAGE_MASK and HPAGE_SIZE David Daney
2011-11-17 23:28 ` Andrew Morton
2011-11-17 23:38 ` David Daney
2011-11-18 8:56 ` Sergei Shtylyov [this message]
2011-11-18 17:14 ` David Daney
2011-11-17 23:22 ` [PATCH v2 0/2] Dummy HPAGE_* constants for !CONFIG_HUGETLB_PAGE David Rientjes
2011-11-17 23:22 ` [patch] hugetlb: remove dummy definitions of HPAGE_MASK and HPAGE_SIZE David Rientjes
2011-11-17 23:35 ` Andrew Morton
2011-11-17 23:44 ` David Rientjes
2011-11-17 23:52 ` David Daney
2011-11-17 23:57 ` Andrew Morton
2011-11-17 23:57 ` David Rientjes
2011-11-21 22:23 ` David Daney
2011-11-21 22:43 ` Linus Torvalds
2011-11-21 23:23 ` David Daney
2011-11-21 23:43 ` Linus Torvalds
2011-11-21 23:50 ` Andrew Morton
2011-11-22 20:41 ` Andi Kleen
2011-11-22 20:41 ` Andi Kleen
2011-11-21 23:47 ` David Daney
2011-11-21 23:53 ` Andrew Morton
2011-11-22 0:37 ` Linus Torvalds
2011-11-22 0:48 ` David Daney
2011-11-22 0:55 ` Linus Torvalds
2011-11-21 22:48 ` David Rientjes
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