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

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Message-ID: <20070825021533.GA12544@c2.user-mode-linux.org>
Date:	Fri, 24 Aug 2007 22:15:33 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, Aug 24, 2007 at 05:20:27PM -0700, Andrew Morton wrote:
> 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.

I agree, I looked at the includes and had the same thoughts.  I sent
it in because there is a problem here, and it fixes a UML config
without noticably breaking anything else.

> 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?

Yes, it's straightforward - 

tlb.h:

static inline void
tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
	...
		free_pages_and_swap_cache(tlb->pages, tlb->nr);
	...
}

swap.h:
#define free_pages_and_swap_cache(pages, nr) \
	release_pages((pages), (nr), 0);

Feel free to drop it, and I'll look at this some more.

				Jeff

-- 
Work email - jdike at linux dot intel dot com
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