linux-kernel - Re: [PATCH -mmotm] mm: unify some pmd

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Message-ID: <16182.1234199195@redhat.com>
Date:	Mon, 09 Feb 2009 17:06:35 +0000
From:	David Howells <dhowells@...hat.com>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	dhowells@...hat.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mmotm] mm: unify some pmd_*() functions

Andrea Righi <righi.andrea@...il.com> wrote:

> Unify all the identical implementations of pmd_free(), __pmd_free_tlb(),
> pmd_alloc_one(), pmd_addr_end() in include/asm-generic/pgtable-nopmd.h

NAK for FRV on two fronts:

 (1) The definition of pud_t in pgtable-nopud.h:

	typedef struct { pgd_t pgd; } pud_t;

     is not consistent with the one in FRV's page.h:

	typedef struct { unsigned long	ste[64];} pmd_t;
	typedef struct { pmd_t		pue[1]; } pud_t;
	typedef struct { pud_t		pge[1];	} pgd_t;

     The upper intermediate page table is contained within the page directory
     entry, not the other way around.  Having a pgd_t inside a pud_t is
     upside-down, illogical and makes things harder to follow IMNSHO.

 (2) It produces the following errors:

mm/memory.c: In function 'free_pmd_range':
mm/memory.c:176: error: implicit declaration of function '__pmd_free_tlb'
  CC      fs/seq_file.o
mm/memory.c: In function '__pmd_alloc':
mm/memory.c:2896: error: implicit declaration of function 'pmd_alloc_one_bug'
mm/memory.c:2896: warning: initialization makes pointer from integer without a cast
mm/memory.c:2905: error: implicit declaration of function 'pmd_free'

David
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