linux-kernel - Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again

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Message-ID: <458B1E06.1030209@tausq.org>
Date:	Fri, 22 Dec 2006 07:51:34 +0800
From:	Randolph Chung <randolph@...sq.org>
To:	Miklos Szeredi <miklos@...redi.hu>
CC:	rmk+lkml@....linux.org.uk, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all
 that again

> I understand now.  I'm not sure how the PARISC implementation can be
> correct in this light.

According to cachetlb.txt:

   void flush_anon_page(struct page *page, unsigned long vmaddr)
         When the kernel needs to access the contents of an anonymous
         page, it calls this function (currently only
         get_user_pages()).  Note: flush_dcache_page() deliberately
         doesn't work for an anonymous page.  The default
         implementation is a nop (and should remain so for all coherent
         architectures).  For incoherent architectures, it should flush
         the cache of the page at vmaddr in the current user process.
                                                ^^^^^^^^^^^^^^^^^^^^

Is the documentation wrong?

randolph
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