From: Pavel Machek <pavel@ucw.cz>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org,
kernel list <linux-kernel@vger.kernel.org>
Subject: Re: register long sp asm("r1") incorrect
Date: Mon, 15 Feb 2010 21:28:54 +0100 [thread overview]
Message-ID: <20100215202854.GA21601@elf.ucw.cz> (raw)
In-Reply-To: <1266263992.16346.125.camel@pasglop>
On Tue 2010-02-16 06:59:52, Benjamin Herrenschmidt wrote:
> On Mon, 2010-02-15 at 08:34 +0100, Pavel Machek wrote:
> > > On Tue, 2010-02-09 at 16:24 +0100, Pavel Machek wrote:
> > > > ...according to gcc docs, sp should be global, or placement in
> > > > register is not guaranteed (except at asm boundaries, but there
> > are
> > > > none).
> > >
> > > Sorry I'm not sure I grok what you mean.
> >
> > Well, according to gcc doscs and my experience, local "register int
> > __asm()" variables only work by accident (or not at all).
>
> Hrm... we definitely rely on that for our thread_info() access, and so
> far it has worked well for us, but I'll poke our gcc folks just in case.
Thanks, and let me know about any results.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2010-02-15 20:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-09 15:24 register long sp asm("r1") incorrect Pavel Machek
2010-02-11 5:31 ` Benjamin Herrenschmidt
2010-02-15 7:34 ` Pavel Machek
2010-02-15 19:59 ` Benjamin Herrenschmidt
2010-02-15 20:28 ` Pavel Machek [this message]
2010-02-15 21:04 ` Benjamin Herrenschmidt
2010-02-15 22:15 ` H. Peter Anvin
2010-02-18 22:57 ` Pavel Machek
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