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

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Date:	Mon, 29 Dec 2014 11:07:27 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	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 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 ?

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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