linux-kernel - Re: [PATCH 1/1] mm: move ->mremap() from file_operations to vm_operations

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Message-ID: <20150625204342.GA31034@redhat.com>
Date:	Thu, 25 Jun 2015 22:43:42 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Hugh Dickins <hughd@...gle.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH 1/1] mm: move ->mremap() from file_operations to
	vm_operations_struct

On 06/24, Kirill A. Shutemov wrote:
>
> On Wed, Jun 24, 2015 at 05:49:14PM +0200, Oleg Nesterov wrote:
> >
> > Wait... Documentation/filesystems/Locking doesn't mention
> > ->mremap() at all.
> >
> > So you actually ask me to add the new documentation? ;)
>
> I tried ;)

Understand ;) but I failed to do this. Serisouly, I simply don't
know what can I add into this (outadted anyway) section except
"called when move_page_tables() targets this vma".

> > I tried to make the minimal change before ->mremap() finds another
> > user in file_operations. I thinks it needs more arguments, at least
> > new_addr and new_len, otherwise it is not easy to document it. The
> > same for f_op->mremap() of course.
> >
> > Currently this does not matter, the only user is aio.c and
> > VM_DONTEXPAND means that it is not mergeable, so mremap() always
> > creates the new vma.
> >
> > Hmm. Can't we do this change and add the documentation later?
>
> I'm fine with that.

OK, so I am sending v2 with the only change: rename aio_ring_remap
to aio_ring_mremap as you suggested.

Oleg.

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