linux-kernel - Re: [PATCH 2/2] revoke: break cow for private mappings

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Message-ID: <84144f020703280309i4e47f9b8w92a369aa7bc16ece@mail.gmail.com>
Date:	Wed, 28 Mar 2007 13:09:41 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] revoke: break cow for private mappings

On 3/28/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > +             ret = get_user_pages(tsk, tsk->mm, vma->vm_start,
> > +                                  vma->vm_end-vma->vm_start, 1, 1, NULL,
> > +                                  NULL);
>
> get_user_pages length argument is in # of pages, rather than address range,
> I think. vma_pages is what you want?

Yes.

On 3/28/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > +     up_write(&mm->mmap_sem);
>
> I think you just need down_read of mmap_sem here?

Indeed. Thanks Nick.

                                  Pekka
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