linux-kernel - Re: [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver

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Date:	Tue, 17 Jul 2007 07:49:15 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	James Bottomley <James.Bottomley@...elEye.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Arnd Bergmann <arnd@...db.de>,
	linux-scsi@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Alessandro Rubini <rubini@...ion.unipv.it>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	Paul Mackerras <paulus@...ba.org>,
	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Subject: Re: [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver


> No ... that was the point of flush_kernel_dcache_page().  The page in
> question is page cache backed and contains user mappings.  However, the
> block layer has already done a flush_dcache_page() in get_user_pages()
> and the user shouldn't be touching memory under I/O (unless they want
> self induced aliasing problems) so we're free to assume all the user
> cachelines are purged, hence all we have to do is flush the kernel alias
> to bring the page up to date and make the users see it correctly.

The block layer will have done that even in the swap-out path ? (Just
asking... I'm not very familiar with the block layer)

Ben.

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