From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: fix highmem with VIPT cache and DMA
Date: Fri, 28 May 2010 21:28:31 +0100 [thread overview]
Message-ID: <20100528202831.GD5189@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20100528194501.GC5189@n2100.arm.linux.org.uk>
On Fri, May 28, 2010 at 08:45:01PM +0100, Russell King - ARM Linux wrote:
> On Fri, May 28, 2010 at 03:26:21PM -0400, Nicolas Pitre wrote:
> > That is exactly the observed behavior on OMAP and Dove when this patch
> > is _not_ applied.
>
> I'm about to test this on my OMAP4 board, which will be a DMA-based test,
> which will be using the same filesystem.
Confirmed - on the OMAP4 board _with_ DMA, this patch fixes a problem
causing various faults in userspace - though it's nowhere near as bad
as the Versatile Express board.
So, we seem to have this behaviour:
- with PIO drivers, with this patch breaks userspace, without fixes userspace
- with DMA drivers, with this patch fixes userspace, without breaks userspace
Note that MMCI does do flush_dcache_page() on PIO read.
Maybe there's something wrong in __flush_dcache_page()?
next prev parent reply other threads:[~2010-05-28 20:28 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-25 21:02 [PATCH] ARM: fix highmem with VIPT cache and DMA Nicolas Pitre
2010-03-26 13:34 ` Catalin Marinas
2010-03-26 15:51 ` Nicolas Pitre
2010-03-26 23:09 ` Russell King - ARM Linux
2010-04-11 14:42 ` Nicolas Pitre
2010-04-12 7:56 ` saeed bishara
2010-04-12 15:36 ` Nicolas Pitre
2010-04-13 7:11 ` saeed bishara
2010-04-13 11:50 ` Nicolas Pitre
2010-04-12 19:41 ` Russell King - ARM Linux
2010-05-28 18:56 ` Russell King - ARM Linux
2010-05-28 19:26 ` Nicolas Pitre
2010-05-28 19:45 ` Russell King - ARM Linux
2010-05-28 20:28 ` Russell King - ARM Linux [this message]
2010-05-28 20:49 ` Nicolas Pitre
2010-05-28 22:19 ` Russell King - ARM Linux
2010-05-29 0:00 ` Nicolas Pitre
-- strict thread matches above, loose matches on Subject: below --
2010-04-23 6:55 Allen Pais
2010-04-25 14:13 ` Nicolas Pitre
2010-04-25 19:01 ` Allen Pais
2010-04-26 1:07 ` Nicolas Pitre
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100528202831.GD5189@n2100.arm.linux.org.uk \
--to=linux@arm.linux.org.uk \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).