From: David Howells <dhowells@redhat.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Christoph Lameter <clameter@sgi.com>,
David Howells <dhowells@redhat.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Arjan van de Ven <arjan@infradead.org>,
Dong Feng <middle.fengdong@gmail.com>,
ak@suse.de, Paul Mackerras <paulus@samba.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: Why Semaphore Hardware-Dependent?
Date: Tue, 29 Aug 2006 17:25:02 +0100 [thread overview]
Message-ID: <5878.1156868702@warthog.cambridge.redhat.com> (raw)
In-Reply-To: <20060829162055.GA31159@linux-mips.org>
Ralf Baechle <ralf@linux-mips.org> wrote:
> > Which arches do not support cmpxchg?
>
> MIPS, Alpha - probably any pure RISC load/store architecture.
Some of these have LL/SC or equivalent instead, but ARM5 and before, FRV, M68K
before 68020 to name but a few.
And anything that implements CMPXCHG with spinlocks is a really bad candidate
for CMPXCHG-based rwsems.
David
next prev parent reply other threads:[~2006-08-29 16:25 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <a2ebde260608271222x2b51693fnaa600965fcfaa6d2@mail.gmail.com>
[not found] ` <1156750249.3034.155.camel@laptopd505.fenrus.org>
2006-08-29 1:18 ` Why Semaphore Hardware-Dependent? Nick Piggin
2006-08-29 6:07 ` Andi Kleen
2006-09-13 17:54 ` Nick Piggin
2006-08-29 10:05 ` David Howells
2006-08-29 10:56 ` Andi Kleen
2006-08-29 17:40 ` Andrew Morton
2006-08-29 19:10 ` Benjamin LaHaise
2006-08-29 15:56 ` Christoph Lameter
2006-08-29 16:20 ` Ralf Baechle
2006-08-29 16:25 ` David Howells [this message]
2006-08-29 16:28 ` Christoph Lameter
2006-08-29 16:57 ` David Howells
2006-08-29 16:53 ` Ralf Baechle
2006-08-29 16:58 ` Geert Uytterhoeven
2006-08-29 17:22 ` Andi Kleen
2006-08-29 17:36 ` Christoph Lameter
2006-08-29 18:18 ` Andi Kleen
2006-08-29 18:30 ` David Howells
2006-08-29 18:33 ` Andi Kleen
2006-08-29 18:56 ` David Howells
2006-08-29 18:41 ` Christoph Lameter
2006-09-13 18:04 ` Nick Piggin
2006-09-13 18:07 ` Christoph Lameter
2006-09-13 18:13 ` Nick Piggin
2006-09-13 18:16 ` Christoph Lameter
2006-09-13 18:50 ` David Howells
2006-09-13 19:25 ` Nick Piggin
2006-09-14 11:41 ` David Howells
2006-09-14 15:27 ` Nick Piggin
2006-09-14 15:38 ` Nick Piggin
2006-09-15 8:59 ` David Howells
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=5878.1156868702@warthog.cambridge.redhat.com \
--to=dhowells@redhat.com \
--cc=ak@suse.de \
--cc=arjan@infradead.org \
--cc=clameter@sgi.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=middle.fengdong@gmail.com \
--cc=nickpiggin@yahoo.com.au \
--cc=paulus@samba.org \
--cc=ralf@linux-mips.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