From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Tabi Timur-B04825 <B04825@freescale.com>
Cc: "borntraeger@de.ibm.com" <borntraeger@de.ibm.com>,
Hendrik Brueckner <brueckner@linux.vnet.ibm.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Anton Blanchard <anton@samba.org>
Subject: Re: hvc_console change results in corrupt oops output
Date: Tue, 05 Jul 2011 16:22:43 +1000 [thread overview]
Message-ID: <1309846963.14501.270.camel@pasglop> (raw)
In-Reply-To: <CAOZdJXW0Lota0ZuEnOHhsU93v7WmvYztEMyfg+UsMKxFdoXNXQ@mail.gmail.com>
On Tue, 2011-07-05 at 04:17 +0000, Tabi Timur-B04825 wrote:
> On Mon, Jul 4, 2011 at 9:24 AM, Hendrik Brueckner
> <brueckner@linux.vnet.ibm.com> wrote:
>
> > I will check this again for my hvc_iucv back-end. Meanwhile a found
> > an old thread discussing the same issue. It covers some differences
> > between console and ttys which actually does not matter for hvc-backend
> > because of the shared put_chars() routine.
> >
> > You can read the thread on lkml.org: http://lkml.org/lkml/2009/10/15/149
>
> I started that thread. After much soul searching, we came to the
> conclusion that HVC is not compatible with hypervisors that return
> BUSY on writes.
That is a fun conclusion considering that hvc has been written for the
pseries hypervisor which ... can return BUSY on writes :-)
> So I threw out my HVC driver and rewrote it as a
> standard console and TTY driver. That driver is waiting to be
> included in the 3.1 kernel.
Sucktastic.
We just need to fix HVC properly.
Cheers,
Ben.
next prev parent reply other threads:[~2011-07-05 6:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-04 10:57 hvc_console change results in corrupt oops output Anton Blanchard
2011-07-04 13:56 ` Benjamin Herrenschmidt
2011-07-04 14:24 ` Hendrik Brueckner
2011-07-05 4:17 ` Tabi Timur-B04825
2011-07-05 6:22 ` Benjamin Herrenschmidt [this message]
2011-07-05 13:51 ` Tabi Timur-B04825
2011-07-05 14:28 ` [RFC] [PATCH] hvc_console: improve tty/console put_chars handling Hendrik Brueckner
2011-07-06 7:49 ` Anton Blanchard
2011-07-06 7:50 ` [PATCH 1/2]: " Anton Blanchard
2011-07-06 7:51 ` [PATCH 2/2]: powerpc/pseries/hvconsole: Fix dropped console output Anton Blanchard
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=1309846963.14501.270.camel@pasglop \
--to=benh@kernel.crashing.org \
--cc=B04825@freescale.com \
--cc=anton@samba.org \
--cc=borntraeger@de.ibm.com \
--cc=brueckner@linux.vnet.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.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).