From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id C90D71A0050 for ; Fri, 15 Jan 2016 16:05:37 +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 8A9CA140BF9 for ; Fri, 15 Jan 2016 16:05:37 +1100 (AEDT) Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 15 Jan 2016 15:05:36 +1000 Received: from d23relay08.au.ibm.com (d23relay08.au.ibm.com [9.185.71.33]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id BC70B2BB0052 for ; Fri, 15 Jan 2016 16:05:34 +1100 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u0F5544B23396476 for ; Fri, 15 Jan 2016 16:05:12 +1100 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u0F552D5006001 for ; Fri, 15 Jan 2016 16:05:02 +1100 Received: from ozlabs.au.ibm.com (ozlabs.au.ibm.com [9.192.253.14]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u0F552MS005139 for ; Fri, 15 Jan 2016 16:05:02 +1100 Received: from camb691.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher AES128-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 0B0AAA028C for ; Fri, 15 Jan 2016 16:04:38 +1100 (AEDT) From: Cyril Bur To: linuxppc-dev@ozlabs.org Subject: [PATCH V2 4/8] powerpc: Explicitly disable math features when copying thread Date: Fri, 15 Jan 2016 16:04:10 +1100 Message-Id: <1452834254-22078-5-git-send-email-cyrilbur@gmail.com> In-Reply-To: <1452834254-22078-1-git-send-email-cyrilbur@gmail.com> References: <1452834254-22078-1-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 dccc87e..e0c3d2d 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1307,6 +1307,7 @@ 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; /* -- 2.7.0