linux-kernel - Re: [PATCH] include linux/pagemap.h in asm-generic/tlb.h

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Message-Id: <20070824172027.0ad5d2c0.akpm@linux-foundation.org>
Date:	Fri, 24 Aug 2007 17:20:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeff Dike <jdike@...toit.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Rob Landley <rob@...dley.net>
Subject: Re: [PATCH] include linux/pagemap.h in asm-generic/tlb.h

On Fri, 24 Aug 2007 14:46:16 -0400
Jeff Dike <jdike@...toit.com> wrote:

> [ This looks non-urgent to me ]
> 
> Without linux/pagemap.h, asm-generic/tlb.h is missing declarations of
> page_cache_release and release_pages.
> 
> Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
> --
>  include/asm-generic/tlb.h |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux-2.6.22/include/asm-generic/tlb.h
> ===================================================================
> --- linux-2.6.22.orig/include/asm-generic/tlb.h	2007-07-08 19:32:17.000000000 -0400
> +++ linux-2.6.22/include/asm-generic/tlb.h	2007-08-22 17:29:45.000000000 -0400
> @@ -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>

This is worrisome.  If you look at pagemap.h, it includes a pile of things
which could easily themsleves try to include tlb.h via some path or
another.  I fear that this patch will cause explosions with some config
and/or architecture.

If you like, tlb.h is a low-level sort of thing whereas pagemap.h is a
higher-level VFS thing.  It is more appropriate that pagemap.h be including
tlb.h.

So I think a better fix would be better, but I'm not able to suggest what,
as there is little detail about the failure here and I can find no mention
of page_cache_release and release_pages in asm-generic/tlb.h.  Presumably
they're getting pulled in via some macro and then instantiated in some
inline function or something?

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