linux-kernel - Re: [patch 1/2] own header file for struct page.

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Message-Id: <20060908094616.48849a7a.akpm@osdl.org>
Date:	Fri, 8 Sep 2006 09:46:16 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [patch 1/2] own header file for struct page.

On Fri, 8 Sep 2006 13:17:16 +0200
Heiko Carstens <heiko.carstens@...ibm.com> wrote:

> From: Heiko Carstens <heiko.carstens@...ibm.com>
> 
> This moves the definition of struct page from mm.h to its own header file
> page.h.
> This is a prereq to fix SetPageUptodate which is broken on s390:
> 
> #define SetPageUptodate(_page)
>        do {
>                struct page *__page = (_page);
>                if (!test_and_set_bit(PG_uptodate, &__page->flags))
>                        page_test_and_clear_dirty(_page);
>        } while (0)
> 
> _page gets used twice in this macro which can cause subtle bugs. Using
> __page for the page_test_and_clear_dirty call doesn't work since it
> causes yet another problem with the page_test_and_clear_dirty macro as
> well.
> In order to get of all these problems caused by macros it seems to
> be a good idea to get rid of them and convert them to static inline
> functions. Because of header file include order it's necessary to have a
> seperate header file for the struct page definition.
> 

hmm.

> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/include/linux/page.h	2006-09-08 13:10:23.000000000 +0200

We have asm/page.h, and one would expect that a <linux/page.h> would be
related to <asm/page.h> in the usual fashion.  But it isn't.

Can we think of a different filename? page-struct.h, maybe? pageframe.h?

> +#ifndef CONFIG_DISCONTIGMEM
> +/* The array of struct pages - for discontigmem use pgdat->lmem_map */
> +extern struct page *mem_map;
> +#endif

Am surprised to see this declaration in this file.
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