linux-kernel - Re: [PATCH 30/38] s390: drop pte

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Message-ID: <20141229103757.GA379@node.dhcp.inet.fi>
Date:	Mon, 29 Dec 2014 12:37:57 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	akpm@...ux-foundation.org, peterz@...radead.org, mingo@...nel.org,
	davej@...hat.com, sasha.levin@...cle.com, hughd@...gle.com,
	linux-mm@...ck.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 30/38] s390: drop pte_file()-related helpers

On Mon, Dec 29, 2014 at 11:07:27AM +0100, Martin Schwidefsky wrote:
> On Wed, 24 Dec 2014 14:22:38 +0200
> "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:
> 
> > We've replaced remap_file_pages(2) implementation with emulation.
> > Nobody creates non-linear mapping anymore.
> > 
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> > Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> > Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> > ---
> > @@ -279,7 +279,6 @@ static inline int is_module_addr(void *addr)
> >   *
> >   * pte_present is true for the bit pattern .xx...xxxxx1, (pte & 0x001) == 0x001
> >   * pte_none    is true for the bit pattern .10...xxxx00, (pte & 0x603) == 0x400
> > - * pte_file    is true for the bit pattern .11...xxxxx0, (pte & 0x601) == 0x600
> >   * pte_swap    is true for the bit pattern .10...xxxx10, (pte & 0x603) == 0x402
> >   */
>  
> Nice, once this is upstream I can free up one of the software bits in
> the pte by redefining the type bits. Right now all of them are used up.
> Is the removal of non-linear mappings a done deal ?

Yes, if no horrible regression will be reported. We don't create
non-linear mapping in -mm (and -next) tree for a few release cycles.
Nobody complained so far.

Ack?

-- 
 Kirill A. Shutemov
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