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

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Date:	Tue, 10 Feb 2009 14:41:37 +0100
From:	Andrea Righi <righi.andrea@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	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

On Mon, Feb 9, 2009 at 6:06 PM, David Howells <dhowells@...hat.com> wrote:
> 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:

This patch generates too many followup fixes and it's better to simply drop it
for now.

I think we need to use a different approach and, more important, we need to
clean a lot of .h files before to avoid the include hell problems.

-Andrea

>
>  (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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