From: Jens Axboe <jens.axboe@oracle.com>
To: Matthew Wilcox <matthew@wil.cx>
Cc: "Luck, Tony" <tony.luck@intel.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: down_spin() implementation
Date: Fri, 28 Mar 2008 14:24:10 +0100 [thread overview]
Message-ID: <20080328132410.GM12346@kernel.dk> (raw)
In-Reply-To: <20080328131750.GT16721@parisc-linux.org>
On Fri, Mar 28 2008, Matthew Wilcox wrote:
> On Fri, Mar 28, 2008 at 01:51:04PM +0100, Jens Axboe wrote:
> > It used to be illegal to pass flags as parameters. IIRC, sparc did some
> > trickery with it. That may still be the case, I haven't checked in a
> > long time.
>
> That problem was removed before 2.6 started, iirc. At least the chapter
> on 'The Fucked Up Sparc' [1] was removed before 2.6.12-rc2 (the
> beginning of git history and I can't be bothered to pinpoint it more
> precisely).
OK
> > Why not just fold __down_spin() into down_spin() and get rid of that
> > nasty anyway?
>
> Could have done. It's moot now that Nick's pointed out how unsafe it
> is to mix down_spin() with plain down().
>
> [1] http://www.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/x467.html
Yeah saw that after replying, so no problem then :)
--
Jens Axboe
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next prev parent reply other threads:[~2008-03-28 13:24 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-25 20:49 What if a TLB flush needed to sleep? Luck, Tony
2008-03-25 21:47 ` Alan Cox
2008-03-26 12:32 ` Matthew Wilcox
2008-03-26 20:29 ` Luck, Tony
2008-03-27 8:09 ` Jens Axboe
2008-03-27 14:15 ` down_spin() implementation Matthew Wilcox
2008-03-28 0:01 ` Nick Piggin
2008-03-28 12:45 ` Matthew Wilcox
2008-03-28 21:16 ` Luck, Tony
2008-03-28 23:48 ` Arnd Bergmann
[not found] ` <20080328124517.GQ16721-6jwH94ZQLHl74goWV3ctuw@public.gmane.org>
2008-03-29 1:04 ` Nick Piggin
2008-03-28 4:51 ` Stephen Rothwell
2008-03-28 5:03 ` Nick Piggin
2008-03-28 12:46 ` Matthew Wilcox
2008-03-28 12:51 ` Jens Axboe
2008-03-28 13:17 ` Matthew Wilcox
2008-03-28 13:24 ` Jens Axboe [this message]
2008-03-26 19:25 ` What if a TLB flush needed to sleep? Christoph Lameter
2008-03-26 20:29 ` Thomas Gleixner
2008-03-27 1:19 ` Christoph Lameter
2008-03-27 13:20 ` Peter Zijlstra
2008-03-27 18:44 ` Christoph Lameter
2008-03-28 9:59 ` Peter Zijlstra
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