linux-kernel - Re: [PATCH 3/7] mm: kill vma flag VM_CAN

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Message-ID: <CA+55aFwsmREkwBHuP_atBm7FJ76J=WjDj8aQsne85gbX9Sk19w@mail.gmail.com>
Date:	Sat, 31 Mar 2012 10:01:08 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 3/7] mm: kill vma flag VM_CAN_NONLINEAR

On Sat, Mar 31, 2012 at 2:29 AM, Konstantin Khlebnikov
<khlebnikov@...nvz.org> wrote:
> This patch moves actual ptes filling for non-linear file mappings
> into special vma operation: ->remap_pages().
>
> Now fs must implement this method to get non-linear mappings support.
> If fs uses filemap_fault() then it can use generic_file_remap_pages() for this.

Me likee.

The other patches in the series look ok too, but this one in
particular is definitely the right thing, and an example of how people
have just used vm_flags bits for all the wrong reasons.

                  Linus
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