linux-kernel - Re: [PATCH] Fix for hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch in -mm

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Date:	Mon, 8 Feb 2010 14:56:05 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
Cc:	Eric B Munson <ebmunson@...ibm.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-man@...r.kernel.org, mtk.manpages@...il.com,
	Arnd Bergman <arnd@...db.de>
Subject: Re: [PATCH] Fix for
 hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch
 in -mm

On Tue, 15 Sep 2009 21:53:12 +0100 (BST) Hugh Dickins wrote:

> On Tue, 15 Sep 2009, Eric B Munson wrote:
> > Resending because this seems to have fallen between the cracks.
> 
> Yes, indeed.  I think it isn't quite what Arnd was suggesting, but I
> agree with you that we might as well go for 0x080000 (so that even Alpha
> can be just a cut-and-paste job from asm-generic), and right now it's
> more important to finalize the number than what file it appears in.
> 
> Acked-by: Hugh Dickins <hugh.dickins@...cali.co.uk>

so what happened with this patch ??

> > 
> > The patch
> > hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch
> > used the value 0x40 for MAP_HUGETLB which is the same value used for
> > various other flags on some architectures.  This collision causes
> > unexpected use of huge pages in the best case and mmap to fail with
> > ENOMEM or ENOSYS in the worst.  This patch changes the value for
> > MAP_HUGETLB to a value that is not currently used on any arch.
> > 
> > This patch should be considered a fix to
> > hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch.
> > 
> > Reported-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> > Signed-off-by: Eric B Munson <ebmunson@...ibm.com>
> > ---
> >  include/asm-generic/mman-common.h |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/include/asm-generic/mman-common.h b/include/asm-generic/mman-common.h
> > index 12f5982..e6adb68 100644
> > --- a/include/asm-generic/mman-common.h
> > +++ b/include/asm-generic/mman-common.h
> > @@ -19,7 +19,7 @@
> >  #define MAP_TYPE	0x0f		/* Mask for type of mapping */
> >  #define MAP_FIXED	0x10		/* Interpret addr exactly */
> >  #define MAP_ANONYMOUS	0x20		/* don't use a file */
> > -#define MAP_HUGETLB	0x40		/* create a huge page mapping */
> > +#define MAP_HUGETLB	0x080000	/* create a huge page mapping */
> >  
> >  #define MS_ASYNC	1		/* sync memory asynchronously */
> >  #define MS_INVALIDATE	2		/* invalidate the caches */
> > -- 

---
~Randy
--
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