From: Marcus Comstedt <marcus@mc.pp.se>
To: Milton Miller <miltonm@bga.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] EHCI Oops on CONFIG_NOT_COHERENT_CACHE system
Date: Wed, 30 Aug 2006 19:42:31 +0200 [thread overview]
Message-ID: <yf9veoa6ry0.fsf@omoikane.mc.pp.se> (raw)
In-Reply-To: <3e3f83654b861ae77c6c07cf207ba6af@bga.com> (Milton Miller's message of "Wed, 30 Aug 2006 09:24:57 -0500")
Milton Miller <miltonm@bga.com> writes:
> I think its a case of the people that know the architecture agree
> that atomics and DMA do not mix, and that this is an issue for
> usb-devel to fix.
That was precisely the kind of agreement I was looking for. :-)
> The other question is: does the current access polute the cache by
> reading things where the device is supposed to be writing?
Well, that shouldn't be an issue as the page is cache-inhibited.
And on systems with cache coherency, where the pages are not cache-
inhibited, this would be handled by bus snooping, right?
> My suggestion is take the issue over there, and only cc us here if
> you get pushback over there.
Ok, will do. Thanks.
// Marcus
next prev parent reply other threads:[~2006-08-30 17:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <9mz9np82b.fsf@omoikane.mc.pp.se>
2006-08-30 14:24 ` [PATCH] EHCI Oops on CONFIG_NOT_COHERENT_CACHE system Milton Miller
2006-08-30 17:42 ` Marcus Comstedt [this message]
2006-08-27 16:17 Marcus Comstedt
2006-08-29 15:07 ` Gerhard Pircher
2006-08-29 21:04 ` Marcus Comstedt
2006-08-30 9:01 ` Gerhard Pircher
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=yf9veoa6ry0.fsf@omoikane.mc.pp.se \
--to=marcus@mc.pp.se \
--cc=linuxppc-dev@ozlabs.org \
--cc=miltonm@bga.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.