From: peterz@infradead.org (Peter Zijlstra)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/3] Add OMAP hardware spinlock misc driver
Date: Mon, 18 Oct 2010 16:33:03 +0200 [thread overview]
Message-ID: <1287412383.29097.1603.camel@twins> (raw)
In-Reply-To: <AANLkTimYK_JVafj5XdN+d9O8h_qon17Jkw7LRpJVZvuO@mail.gmail.com>
On Mon, 2010-10-18 at 16:28 +0200, Ohad Ben-Cohen wrote:
> On Mon, Oct 18, 2010 at 3:43 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > Right, so the problem is that there simply is no way to do atomic memory
> > access from these auxiliary processing units wrt the main CPU?
>
> Yes. There are a few relevant system-wide limitations, one of them is
> that simply the system interconnect does not support those fancy
> atomic operations.
Does it support full memory coherency though? Otherwise I can see memory
based message passing becoming rather interesting.
Without coherency everybody needs to be damn sure to flush the relevant
bits before unlocking and such.
next prev parent reply other threads:[~2010-10-18 14:33 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-18 7:44 [PATCH 0/3] Add OMAP hardware spinlock misc driver Ohad Ben-Cohen
2010-10-18 7:44 ` [PATCH 1/3] drivers: misc: add omap_hwspinlock driver Ohad Ben-Cohen
2010-10-19 15:46 ` Greg KH
2010-10-19 20:18 ` Ohad Ben-Cohen
2010-10-19 16:58 ` Kevin Hilman
2010-10-19 20:21 ` Ohad Ben-Cohen
2010-10-19 17:01 ` Grant Likely
2010-10-19 20:43 ` Ohad Ben-Cohen
2010-10-19 20:58 ` Arnd Bergmann
2010-10-19 21:57 ` Ohad Ben-Cohen
2010-10-19 17:16 ` Kevin Hilman
2010-10-20 13:00 ` Ohad Ben-Cohen
2010-10-20 18:18 ` Kevin Hilman
2010-10-19 17:21 ` Arnd Bergmann
2010-10-19 20:51 ` Ohad Ben-Cohen
2010-10-19 21:08 ` Arnd Bergmann
2010-10-20 22:43 ` Ohad Ben-Cohen
2010-10-21 9:04 ` Arnd Bergmann
2010-10-21 10:13 ` Ohad Ben-Cohen
2010-10-21 12:02 ` Arnd Bergmann
2010-10-22 17:00 ` Tony Lindgren
2010-10-18 7:44 ` [PATCH 2/3] OMAP4: hwmod data: Add hwspinlock Ohad Ben-Cohen
2010-10-18 7:44 ` [PATCH 3/3] omap: add hwspinlock device Ohad Ben-Cohen
2010-10-19 17:03 ` Kevin Hilman
2010-10-19 17:05 ` Grant Likely
2010-10-19 21:02 ` Ohad Ben-Cohen
2010-10-19 23:12 ` Grant Likely
2010-10-20 14:09 ` Ohad Ben-Cohen
2010-10-20 15:51 ` Grant Likely
2010-10-19 23:53 ` Kevin Hilman
2010-10-20 1:20 ` Ryan Mallon
2010-10-20 14:38 ` Ohad Ben-Cohen
2010-10-20 15:55 ` Grant Likely
2010-10-20 18:37 ` Kevin Hilman
2010-10-20 19:21 ` Ohad Ben-Cohen
2010-10-20 23:58 ` Kevin Hilman
2010-10-21 6:11 ` Ohad Ben-Cohen
2010-10-21 8:36 ` Kamoolkar, Mugdha
2010-10-21 9:06 ` Ohad Ben-Cohen
2010-10-22 9:59 ` Kamoolkar, Mugdha
2010-10-22 11:16 ` Ohad Ben-Cohen
2010-10-21 12:26 ` Kanigeri, Hari
2010-10-22 10:14 ` Kamoolkar, Mugdha
2010-10-22 16:56 ` Tony Lindgren
2010-10-22 17:03 ` Grant Likely
2010-10-22 17:28 ` Tony Lindgren
2010-10-24 17:54 ` Ohad Ben-Cohen
2010-10-25 19:02 ` Tony Lindgren
2010-10-26 11:54 ` Ohad Ben-Cohen
2010-10-26 19:06 ` Tony Lindgren
2010-10-18 12:46 ` [PATCH 0/3] Add OMAP hardware spinlock misc driver Peter Zijlstra
2010-10-18 13:35 ` Russell King - ARM Linux
2010-10-18 13:43 ` Peter Zijlstra
2010-10-18 14:28 ` Ohad Ben-Cohen
2010-10-18 14:33 ` Peter Zijlstra [this message]
2010-10-18 14:39 ` Ohad Ben-Cohen
2010-10-18 15:27 ` Catalin Marinas
2010-10-18 15:32 ` Peter Zijlstra
2010-10-18 15:35 ` Ohad Ben-Cohen
2010-10-18 15:48 ` Peter Zijlstra
2010-10-18 15:51 ` Catalin Marinas
2010-10-18 15:58 ` Peter Zijlstra
2010-10-19 23:31 ` Daniel Walker
2010-10-20 6:13 ` Ohad Ben-Cohen
2010-10-20 10:00 ` Ohad Ben-Cohen
2010-10-20 22:29 ` Bryan Huntsman
2010-10-20 9:53 ` Russell King - ARM Linux
2010-10-20 22:15 ` Daniel Walker
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=1287412383.29097.1603.camel@twins \
--to=peterz@infradead.org \
--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).