From: Michael Ellerman <michael@ellerman.id.au>
To: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Cc: miltonm@bga.com, paulus@samba.org, anton@samba.org,
nfont@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] pseries/iommu: remove DDW on kexec
Date: Tue, 29 Jan 2013 21:58:28 +1100 [thread overview]
Message-ID: <1359457108.26096.7.camel@concordia> (raw)
In-Reply-To: <20130129020357.GB12156@linux.vnet.ibm.com>
On Mon, 2013-01-28 at 18:03 -0800, Nishanth Aravamudan wrote:
> pseries/iommu: remove DDW on kexec
> ...
>
> I believe the simplest, easiest-to-maintain fix is to just change our
> initcall to, rather than detecting and updating the new kernel's DDW
> knowledge, just remove all DDW configurations. When the drivers
> re-initialize, we will set everything back up as it was before.
I don't know this code at all, but this sounds like it will also work
for kdump, right? ie. when the original kernel has crashed the 2nd
kernel will tear the DDW down and set it back up.
cheers
next prev parent reply other threads:[~2013-01-29 10:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-29 2:02 [PATCH 1/2] pseries/iommu: restore_default_window does not use liobn parameter Nishanth Aravamudan
2013-01-29 2:03 ` [PATCH 2/2] pseries/iommu: remove DDW on kexec Nishanth Aravamudan
2013-01-29 10:58 ` Michael Ellerman [this message]
2013-01-29 20:33 ` Nishanth Aravamudan
2013-02-04 3:38 ` Michael Ellerman
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=1359457108.26096.7.camel@concordia \
--to=michael@ellerman.id.au \
--cc=anton@samba.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=miltonm@bga.com \
--cc=nacc@linux.vnet.ibm.com \
--cc=nfont@linux.vnet.ibm.com \
--cc=paulus@samba.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).