linux-kernel - Re: O_DIRECT patch for processors with VIPT cache for mainline kernel (specifically arm in our case)

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Message-ID: <b647ffbd0811200428u2b41b108ifb02872563c871ab@mail.gmail.com>
Date:	Thu, 20 Nov 2008 13:28:03 +0100
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	"Naval Saini" <navalnovel@...il.com>, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, naval.saini@....com,
	"Ralf Baechle" <ralf@...ux-mips.org>
Subject: Re: O_DIRECT patch for processors with VIPT cache for mainline kernel (specifically arm in our case)

2008/11/20 Nick Piggin <nickpiggin@...oo.com.au>:
>
> [ ... ]
>
> - The page is sent to the block layer, which stores into the page. Some
>  block devices like 'brd' will potentially store via the kernel linear map
>  here, and they probably don't do enough cache flushing.

btw., if someone is curious, here is another case of what may happen
on VIPT systems when someone uses a "virtual" block device (like
'brd') as, heh, a swap :-)

http://www.linux-mips.org/archives/linux-mips/2008-11/msg00038.html


-- 
Best regards,
Dmitry Adamushko
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