From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: ux500: Initialize irq affinity
Date: Fri, 20 Jan 2012 16:03:28 +0000 [thread overview]
Message-ID: <4F199050.5080702@arm.com> (raw)
In-Reply-To: <CACRpkdYgT-Q+ZEzhjOaOb_2Pihx0-pMXo+Dc-CESDT7BAWAOqg@mail.gmail.com>
On 20/01/12 15:45, Linus Walleij wrote:
> On Fri, Jan 20, 2012 at 2:03 PM, Russell King - ARM Linux
> <linux@arm.linux.org.uk> wrote:
>> On Fri, Jan 20, 2012 at 01:59:16PM +0100, Per Fransson wrote:
>>> Use irq_set_affinity() to initialize the kernel view of irq affinity
>>> when programming the GIC registers.
>>
>> Why is this necessary?
>
> Necessary: we don't quite know. (Maybe should have been RFC, but
> this patch is better than being silent of it...)
>
> On the Ux500 all shared peripheral IRQs (32 thru 127) are delivered
> to CPU0 (hardwired, will not work on CPU1), I have heard that this
> is sort of what everybody does but don't know for sure. (Marc?)
Not as far as I know. My platforms seems to happily deliver interrupts
on other cores by setting the SMP affinity (just tested on my EB11MP).
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2012-01-20 16:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-20 12:59 [PATCH] ARM: ux500: Initialize irq affinity Per Fransson
2012-01-20 13:03 ` Russell King - ARM Linux
2012-01-20 15:45 ` Linus Walleij
2012-01-20 16:03 ` Marc Zyngier [this message]
2012-01-20 16:08 ` Will Deacon
2012-01-20 17:44 ` Russell King - ARM Linux
2012-01-20 21:28 ` Per Fransson
2012-01-22 12:54 ` Will Deacon
2012-01-22 15:27 ` Russell King - ARM Linux
2012-01-24 11:04 ` Will Deacon
2012-01-24 22:00 ` Linus Walleij
2012-01-20 17:50 ` Russell King - ARM Linux
2012-01-20 17:56 ` Linus Walleij
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=4F199050.5080702@arm.com \
--to=marc.zyngier@arm.com \
--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 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.