From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 52B631A073D for ; Wed, 18 Nov 2015 14:28:49 +1100 (AEDT) Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id C5FFB14141A for ; Wed, 18 Nov 2015 14:28:48 +1100 (AEDT) Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 18 Nov 2015 13:28:46 +1000 Received: from d23relay07.au.ibm.com (d23relay07.au.ibm.com [9.190.26.37]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id EB8EC2CE8055 for ; Wed, 18 Nov 2015 14:28:44 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay07.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id tAI3ScrF33882116 for ; Wed, 18 Nov 2015 14:28:46 +1100 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id tAI3SCp6027540 for ; Wed, 18 Nov 2015 14:28:12 +1100 From: Cyril Bur To: mikey@neuling.org, anton@samba.org, linuxppc-dev@ozlabs.org Subject: [PATCH 4/8] powerpc: Explicitly disable math features when copying thread Date: Wed, 18 Nov 2015 14:26:51 +1100 Message-Id: <1447817215-15804-5-git-send-email-cyrilbur@gmail.com> In-Reply-To: <1447817215-15804-1-git-send-email-cyrilbur@gmail.com> References: <1447817215-15804-1-git-send-email-cyrilbur@gmail.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , With threads leaving the math bits enabled in their saved MSR to indicate that the hardware is hot and a restore is not needed, children need to turn it off as when they do get scheduled, there's no way their registers could have been hot. Signed-off-by: Cyril Bur --- arch/powerpc/kernel/process.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 398f7bf..441d9e5 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1243,6 +1243,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, f = ret_from_fork; } + childregs->msr &= ~(MSR_FP|MSR_VEC|MSR_VSX); sp -= STACK_FRAME_OVERHEAD; /* -- 2.6.2