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Re: MIPS asm/mman.h and MADV_HWPOISON

To: "Joseph S. Myers" <joseph@codesourcery.com>
Subject: Re: MIPS asm/mman.h and MADV_HWPOISON
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 26 Nov 2009 18:30:07 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <Pine.LNX.4.64.0911252356300.31853@digraph.polyomino.org.uk>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <Pine.LNX.4.64.0911252356300.31853@digraph.polyomino.org.uk>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-08-17)
On Wed, Nov 25, 2009 at 11:57:07PM +0000, Joseph S. Myers wrote:

> In the course of updating glibc ports's bits/mman.h files for new MADV_* 
> definitions, I noticed that arch/mips/include/asm/mman.h does not define 
> MADV_HWPOISON, although architectures using asm-generic/mman.h get that 
> definition automatically.  Should I take it that this is an oversight and 
> that a definition of MADV_HWPOISON will be added with value 100, or is 
> there some reason for it not to be defined for MIPS or for it to have a 
> different value?

Just an omission.  Thanks for reporting.  I've just checked in below
patch.

  Ralf

From: Ralf Baechle <ralf@linux-mips.org>

MIPS: Add missing definition for MADV_HWPOISON.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/mman.h b/arch/mips/include/asm/mman.h
index a2250f3..c892bfb 100644
--- a/arch/mips/include/asm/mman.h
+++ b/arch/mips/include/asm/mman.h
@@ -75,6 +75,7 @@
 
 #define MADV_MERGEABLE   12            /* KSM may merge identical pages */
 #define MADV_UNMERGEABLE 13            /* KSM may not merge identical pages */
+#define MADV_HWPOISON    100           /* poison a page for testing */
 
 /* compatibility flags */
 #define MAP_FILE       0

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