From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from penguin.netx4.com (embeddededge.com [209.113.146.155]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id B6A2267A64 for ; Fri, 1 Apr 2005 04:16:08 +1000 (EST) In-Reply-To: <1CFEB358338412458B21FAA0D78FE86D4F0D23@rennsmail02.eu.thmulti.com> References: <1CFEB358338412458B21FAA0D78FE86D4F0D23@rennsmail02.eu.thmulti.com> Mime-Version: 1.0 (Apple Message framework v619.2) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <074219cef09e4112ab23d9168d881517@embeddededge.com> From: Dan Malek Date: Thu, 31 Mar 2005 13:15:57 -0500 To: "Fillod Stephane" Cc: linuxppc-dev@ozlabs.org Subject: Re: [PATCH] invalid instructions in kernel mode List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Mar 31, 2005, at 12:47 PM, Fillod Stephane wrote: > When CPU has no (classic) FPU, and math emulation is disabled, > fp instructions are not allowed in kernel mode. FP Instructions are never allowed in kernel mode regardless of the CPU. However, with math emulation disabled and no FPU, we still emulate FP load/store operations because they are usually hard coded in some of the context save/restore functions of the C library. > This bug has been found with crashme (crash01) of LTP, on a e500 > system. What is the bug? This patch disables a big feature we have been using for many years. Please take another look at this. Thanks. -- Dan