From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 12 Aug 2002 09:34:30 -0500 From: Peter Bergner To: Paul Mackerras Cc: Mike Corrigan , Anton Blanchard , linuxPPC Dev Subject: Re: FP save/restore code in ppc32/ppc64 kernels Message-ID: <20020812143430.GA35003@congo.borg.umn.edu> References: <15698.61945.251112.661796@argo.ozlabs.ibm.com> <20020808210927.A870681@brule.borg.umn.edu> <15703.8116.483898.162119@argo.ozlabs.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <15703.8116.483898.162119@argo.ozlabs.ibm.com> Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: 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/