linux-kernel - Re: [PATCH V3 1/2] mm: Update generic gup implementation to handle hugepage directory

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Message-ID: <1414558008.7417.2.camel@concordia>
Date:	Wed, 29 Oct 2014 15:46:48 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Steve Capper <steve.capper@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	benh@...nel.crashing.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH V3 1/2] mm: Update generic gup implementation to handle
 hugepage directory

On Tue, 2014-10-28 at 10:44 +0000, Steve Capper wrote:
> On Mon, Oct 27, 2014 at 06:32:41PM -0700, Andrew Morton wrote:
> > On Tue, 28 Oct 2014 12:20:29 +1100 Michael Ellerman <mpe@...erman.id.au> wrote:
> > 
> > > On Mon, 2014-10-27 at 16:06 -0700, Andrew Morton wrote:
> > > > On Sat, 25 Oct 2014 16:14:19 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> > > > 
> > > > > Update generic gup implementation with powerpc specific details.
> > > > > On powerpc at pmd level we can have hugepte, normal pmd pointer
> > > > > or a pointer to the hugepage directory.
> > > > 
> > > > I grabbed these.  It would be better if they were merged into the powerpc
> > > > tree where they'll get more testing than in linux-next alone.
> > >  
> > > Fine by me. Can I get an ack from you and/or someone else on CC?
> > 
> > Only arm and arm64 use this code.  Steve, could you please look it over
> > and check that arm is still happy?
> 
> Hi Andrew,
> I've tested it and posted some comments on it.
> 
> If the arch/arm and arch/arm64 changes are removed and a comment about
> an assumption made by the new gup_huge_pte code is added then I'm happy.

OK thanks Steve.

Aneesh can you do those changes and resend and I'll put it in powerpc next.

cheers


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