linux-kernel - Re: [PATCH] Include missing header in include/asm-sparc64/tlb.h

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Date:	Mon, 05 Feb 2007 13:40:43 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mathieu.desnoyers@...ymtl.ca
Cc:	linux-kernel@...r.kernel.org, torvalds@...l.org, akpm@...l.org
Subject: Re: [PATCH] Include missing header in include/asm-sparc64/tlb.h

From: David Miller <davem@...emloft.net>
Date: Mon, 05 Feb 2007 13:31:37 -0800 (PST)

> From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> Date: Mon, 5 Feb 2007 12:57:14 -0500
> 
> > Include missing header in include/asm-sparc64/tlb.h
> > 
> > sparc64 does not compile without this. It applies on 2.6.20.
> > 
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> 
> It builds perfectly fine for me with several different config variants
> without adding this include.
> 
> Please provide the build failure messages and your kernel config so
> this can be properly analyzed, thank you.

BTW, I did an analysis of asm-sparc64/tlb.h and it needs two
MM layer structure definitions or forward declarations related
to pages:

1) struct page.  But it just declares pointers, it never
   dereferences a struct page.

2) free_pages_and_swap_cache().

Both should be handled by the linux/swap.h include, linux/swap.h
makes use of "struct page" pointers in declarations and it provides
the extern for free_pages_and_swap_cache().

So why does include/asm-sparc64/tlb.h need to include linux/pagemap.h?

This would be easy to figure out if you had provided the build error
messages that prompted this change from the beginning.

Perhaps you have a local change of some kind that creates this
requirement?  Or did you see "free_pages_and_swap_cache()" and
think that function is declared in linux/pagemap.h instead of
it's true location which is linux/swap.h?

Thank you.
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