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Re: Malta crashes on the latest 2.4 kernel

To: Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: Malta crashes on the latest 2.4 kernel
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Thu, 11 Jul 2002 13:45:49 +0200
Cc: "Kevin D. Kissell" <kevink@mips.com>, "H. J. Lu" <hjl@lucon.org>, Jun Sun <jsun@mvista.com>, Linux/MIPS Development <linux-mips@oss.sgi.com>
In-reply-to: <Pine.GSO.4.21.0207110854250.8371-100000@vervain.sonytel.be>; from geert@linux-m68k.org on Thu, Jul 11, 2002 at 08:56:17AM +0200
References: <005c01c228a2$fb2bf450$10eca8c0@grendel> <Pine.GSO.4.21.0207110854250.8371-100000@vervain.sonytel.be>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mutt/1.2.5.1i
On Thu, Jul 11, 2002 at 08:56:17AM +0200, Geert Uytterhoeven wrote:

> On Thu, 11 Jul 2002, Kevin D. Kissell wrote:
> > I note that Ralf has, in fact, applied the fix to the
> > OSS CVS repository.  I also note that "BARRIER"
> > is still defined to be a string of 6 nops.  I would argue
> > (again) that those really, really ought to be ssnops,
> > and that if they *were* ssnops, one could probably
> > have fewer of them.
> 
> Sorry for being ignorant, but what's the difference between nop and ssnop?
> 
> I see that SSNOP is defined to be `sll zero,zero,1' in <asm/asm.h>, but that
> doesn't give me any clue.

Ssnop is a superscalar nop.  It's instruction encoding is the same as of
sll, zero, zero, 1.  Unlike a normal nop a ssnop is guaranteed to single
issue even on superscalar implementations.

  Ralf


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