From: Peter Bergner <bergner@borg.umn.edu>
To: Paul Mackerras <paulus@au1.ibm.com>
Cc: Mike Corrigan <mikejc@us.ibm.com>,
Anton Blanchard <anton@samba.org>,
linuxPPC Dev <linuxppc-dev@lists.linuxppc.org>
Subject: Re: FP save/restore code in ppc32/ppc64 kernels
Date: Mon, 12 Aug 2002 09:34:30 -0500 [thread overview]
Message-ID: <20020812143430.GA35003@congo.borg.umn.edu> (raw)
In-Reply-To: <15703.8116.483898.162119@argo.ozlabs.ibm.com>
Paul Mackerras wrote:
:> It might be a good idea to clear the fpscr after saving it out to
:> the thread struct though...
:
: Exactly. We don't. If we did then we could do as you say and it
: would work on SMP. We could do that as long as we are sure we won't
: ever want to do a UP kernel on ppc64...
Or we could force the UP kernel to act like the SMP kernel and not
use lazy save. How big of a "win" is lazy save on UP kernels?
I will also note that UP kernels haven't worked for nearly 2 years
on PPC64.
Peter
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-08-12 14:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 14:01 FP save/restore code in ppc32/ppc64 kernels Mike Corrigan
2002-08-08 22:34 ` Paul Mackerras
2002-08-09 2:09 ` Peter Bergner
2002-08-12 2:38 ` Paul Mackerras
2002-08-12 14:34 ` Peter Bergner [this message]
2002-08-14 2:20 ` Peter Bergner
-- strict thread matches above, loose matches on Subject: below --
2002-08-07 16:23 Peter Bergner
2002-08-08 11:46 ` Anton Blanchard
2002-08-08 13:18 ` Anton Blanchard
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