linux-kernel - Re: [git patches] xfs and block fixes for virtually indexed arches

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Message-ID: <alpine.LFD.2.00.0912171016430.15740@localhost.localdomain>
Date:	Thu, 17 Dec 2009 10:17:03 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
cc:	Christoph Hellwig <hch@...radead.org>, tytso@....edu,
	Kyle McMartin <kyle@...artin.ca>, linux-parisc@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	James.Bottomley@...e.de, linux-arch@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [git patches] xfs and block fixes for virtually indexed arches



On Thu, 17 Dec 2009, Russell King wrote:
> 
> That's not entirely true.  If you have write back caches which are not DMA
> coherent, you need to as a minimum:
> 
> - on write, clean the cache to ensure that the page is up to date with data
>   held in cache.
> 
> - on read, you must ensure that there are no potential write-backs before
>   the read commenses and invalidate at some point.

Right you are.

		Linus
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