linux-kernel - Re: Powerpc - Include pagemap.h in asm/powerpc/tlb.h

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Date:	Thu, 19 Jul 2007 14:55:23 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linuxppc-dev@...abs.org, Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Powerpc - Include pagemap.h in asm/powerpc/tlb.h


On Jul 19, 2007, at 12:30 AM, Andrew Morton wrote:

> On Fri, 13 Jul 2007 21:20:33 -0400 Mathieu Desnoyers  
> <mathieu.desnoyers@...ymtl.ca> wrote:
>
>> Powerpc - Include pagemap.h in asm/powerpc/tlb.h
>>
>> Fixes this powerpc build error in 2.6.22-rc6-mm1 for powerpc 64 :
>>
>> In file included from include2/asm/tlb.h:60,
>>                  from /home/compudj/git/linux-2.6-lttng/arch/ 
>> powerpc/mm/init_64.
>> c:56:
>> /home/compudj/git/linux-2.6-lttng/include/asm-generic/tlb.h: In  
>> function 'tlb_fl
>> ush_mmu':
>> /home/compudj/git/linux-2.6-lttng/include/asm-generic/tlb.h:76:  
>> error: implicit
>> declaration of function 'release_pages'
>> /home/compudj/git/linux-2.6-lttng/include/asm-generic/tlb.h: In  
>> function 'tlb_re
>> move_page':
>> /home/compudj/git/linux-2.6-lttng/include/asm-generic/tlb.h:105:  
>> error: implicit
>>  declaration of function 'page_cache_release'
>
> You have some wordwrapping going on there.
>
>> make[2]: *** [arch/powerpc/mm/init_64.o] Error 1
>>
>> release_pages is declared in linux/pagemap.h, but cannot be  
>> included in
>> linux/swap.h because of a sparc related comment:
>>
>> /* only sparc can not include linux/pagemap.h in this file
>>  * so leave page_cache_release and release_pages undeclared... */
>> #define free_page_and_swap_cache(page) \
>>         page_cache_release(page)
>> #define free_pages_and_swap_cache(pages, nr) \
>>         release_pages((pages), (nr), 0);
>
> It's always a worry when this happens.  What change made us need this
> inclusion?  How come you're hitting it but I (and test.kernel.org,  
> at least)
> did not?  How come so few other architectures include pagemap.h from
> asm/tlb.h?  Why do header files get into such a mess?
>
>
>> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
>> CC: linuxppc-dev@...abs.org
>> CC: Paul Mackerras <paulus@...ba.org>
>> ---
>>  include/asm-powerpc/tlb.h |    2 ++
>>  1 file changed, 2 insertions(+)
>>
>> Index: linux-2.6-lttng/include/asm-powerpc/tlb.h
>> ===================================================================
>> --- linux-2.6-lttng.orig/include/asm-powerpc/tlb.h	2007-07-13  
>> 11:30:54.000000000 -0400
>> +++ linux-2.6-lttng/include/asm-powerpc/tlb.h	2007-07-13  
>> 11:31:22.000000000 -0400
>> @@ -23,6 +23,8 @@
>>  #include <asm/mmu.h>
>>  #endif
>>
>> +#include <linux/pagemap.h>
>> +
>>  struct mmu_gather;
>>
>
> Oh well.  I queued it up for someone else to worry over ;)

Andrew,

Are you sending this to linus directly or should this go via paul and  
me?

- k


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