linux-kernel - Re: [PATCH] mm: allocate usemap at first instead of mem_map in sparse

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Date:	Wed, 2 Apr 2008 18:43:24 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Yinghai Lu" <yhlu.kernel.send@...il.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Badari Pulavarty" <pbadari@...ibm.com>, michael@...erman.id.au,
	"Kamalesh Babulal" <kamalesh@...ux.vnet.ibm.com>,
	linuxppc-dev@...abs.org,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
	"kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: allocate usemap at first instead of mem_map in sparse_init

On Wed, Apr 2, 2008 at 5:44 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
> On Wed, Apr 2, 2008 at 3:52 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>  >
>  > On Wed, 2 Apr 2008 15:25:48 -0700 Yinghai Lu <yhlu.kernel.send@...il.com> wrote:
>  >
>  >  > [PATCH] mm: allocate usemap at first instead of mem_map in sparse_init
>  >  >
>  >  > on powerpc,
>  >  >
>  >  > On Wed, Apr 2, 2008 at 12:22 PM, Badari Pulavarty <pbadari@...ibm.com> wrote:
>  >  > >
>  >  > > On Wed, 2008-04-02 at 18:17 +1100, Michael Ellerman wrote:
>  >  > >  > On Wed, 2008-04-02 at 12:38 +0530, Kamalesh Babulal wrote:
>  >  > >  > > Andrew Morton wrote:
>  >  > >  > > > On Wed, 02 Apr 2008 11:55:36 +0530 Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:
>  >  > so try to allocate usemap at first altogether.
>  >
>  >  I have to turn all the above crud into a proper changelog.  I'd prefer that
>  >  you do it.
>  >
>  >  Unless this patch should be folded into another one, in which case it
>  >  doesn't matter.
>  >
>  >
>  >  > Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>  >  >
>  >  > diff --git a/mm/sparse.c b/mm/sparse.c
>  >  > index d3cb085..782ebe5 100644
>  >  > --- a/mm/sparse.c
>  >  > +++ b/mm/sparse.c
>  >
>  >  We shouldn't merge this patch on its own because then that will leave a
>  >  non-bisectable region in the powerpc history.
>  >
>  >  So which patch is this patch fixing?  Lexically it applies to
>  >  mm-allocate-section_map-for-sparse_init.patch (and its updates).  But is
>  >  that where it logically lies?
>
>  yes. we should fold
>
>
>  mm-make-mem_map-allocation-continuous.patch
>
> mm-allocate-section_map-for-sparse_init.patch
>  and this one
>

please check the big one.
http://lkml.org/lkml/2008/4/2/650

YH
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