linux-kernel - Re: [PATCHv3 01/17] mm: add missing __PAGETABLE_{PUD,PMD}

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Message-ID: <20150226200455.GB14117@fuloong-minipc.musicnaut.iki.fi>
Date:	Thu, 26 Feb 2015 22:04:55 +0200
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Helge Deller <deller@....de>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Koichi Yasutake <yasutake.koichi@...panasonic.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCHv3 01/17] mm: add missing __PAGETABLE_{PUD,PMD}_FOLDED
 defines

Hi,

On Thu, Feb 26, 2015 at 01:35:04PM +0200, Kirill A. Shutemov wrote:
> Core mm expects __PAGETABLE_{PUD,PMD}_FOLDED to be defined if these page
> table levels folded. Usually, these defines are provided by
> <asm-generic/pgtable-nopmd.h> and <asm-generic/pgtable-nopud.h>.
> 
> But some architectures fold page table levels in a custom way. They need
> to define these macros themself. This patch adds missing defines.
> 
> The patch fixes mm->nr_pmds underflow and eliminates dead __pmd_alloc()
> and __pud_alloc() on architectures without these page table levels.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Aaro Koskinen <aaro.koskinen@....fi>

PA-RISC change:

Tested-by: Aaro Koskinen <aaro.koskinen@....fi>

A.
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