linux-kernel - Re: [PATCH -next] fs: fix fs/fs-writeback.c build error

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Date:	Fri, 6 Jan 2012 15:01:09 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Randy Dunlap <rdunlap@...otime.net>,
	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -next] fs: fix fs/fs-writeback.c build error

On Thu, Jan 5, 2012 at 4:18 PM, Randy Dunlap <rdunlap@...otime.net> wrote:
>
> In linux-next, fs/fs-writeback.c no longer #includes <linux/buffer_head.h>,
> which #included <linux/pagemap.h>, so add that latter header file to
> <linux/writeback.h> to fix the build error:
>
> fs/fs-writeback.c:510:11: error: 'PAGE_CACHE_SHIFT' undeclared (first use in this function)

I would actually suggest:

 - move the whole MIN_WRITEBACK_PAGES #define from the header file to
fs/writeback.c (why expose such a random #define to outside users that
have nothing to do with it?)

 - make sure that fs/fs-writeback.c has that pagemap.h #include.

There's no reason why <linux/writeback.h> should include filemap.h per
se, and there is no reason why it should expose some internal chunking
#define to anybody else.

Wu?

                  Linus
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