linux-kernel - Re: [2.6 patch] linux/swap.h must #include <linux/pagemap.h>

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Date:	Sat, 26 Jul 2008 19:59:08 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] linux/swap.h must #include <linux/pagemap.h>

Hi,

Adrian Bunk <bunk@...nel.org> writes:

> On Sat, Jul 26, 2008 at 07:18:05PM +0200, Haavard Skinnemoen wrote:
>> This fixes the following compile error on avr32, introduced by
>> commit ba92a43dbaee339cf5915ef766d3d3ffbaaf103c
>> (exec: remove some includes):
>> 
>> In file included from include/asm/tlb.h:24,
>>                  from fs/exec.c:55:
>> include/asm-generic/tlb.h: In function 'tlb_flush_mmu':
>> include/asm-generic/tlb.h:76: error: implicit declaration of function 'release_pages'
>> include/asm-generic/tlb.h: In function 'tlb_remove_page':
>> include/asm-generic/tlb.h:105: error: implicit declaration of function 'page_cache_release'
>> make[1]: *** [fs/exec.o] Error 1
>> 
>> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
>> ---
>>  include/asm-generic/tlb.h |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>> 
>> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
>> index f490e43..f85f3a2 100644
>> --- a/include/asm-generic/tlb.h
>> +++ b/include/asm-generic/tlb.h
>> @@ -13,6 +13,7 @@
>>  #ifndef _ASM_GENERIC__TLB_H
>>  #define _ASM_GENERIC__TLB_H
>>  
>> +#include <linux/pagemap.h>
>>  #include <linux/swap.h>
>>  #include <asm/pgalloc.h>
>>  #include <asm/tlbflush.h>
>
> The patch is not the correct fix since the actual problem comes from 
> free_pages_and_swap_cache() in swap.h
>
> Patch is below, but it has not yet gotten enough testing that I'm 100% 
> confident it doesn't break anything else...

There is a comment about sparc and linux/pagemap.h in linux/swap.h.
Adrian, do you cross-compile for sparc?  If this issue is fixed, the
comment should probably go away and your patch is fine.

Otherwise, declaring page_cache_release() and release_pages() just above
these macros is perhaps the safer approach?

I agree that asm-generic/tlb.h should not include linux/swap.h.

	Hannes
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