From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934158AbbHJKRY (ORCPT ); Mon, 10 Aug 2015 06:17:24 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:44116 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934076AbbHJKRF (ORCPT ); Mon, 10 Aug 2015 06:17:05 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Heiko Carstens" , "Martin Schwidefsky" Date: Mon, 10 Aug 2015 12:12:31 +0200 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 080/110] s390/process: fix sfpc inline assembly In-Reply-To: X-SA-Exim-Connect-IP: 2.173.94.72 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.71-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Heiko Carstens commit e47994dd44bcb4a77b4152bd0eada585934703c0 upstream. The sfpc inline assembly within execve_tail() may incorrectly set bits 28-31 of the sfpc instruction to a value which is not zero. These bits however are currently unused and therefore should be zero so we won't get surprised if these bits will be used in the future. Therefore remove the second operand from the inline assembly. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- arch/s390/kernel/process.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -250,7 +250,7 @@ asmlinkage void execve_tail(void) { current->thread.fp_regs.fpc = 0; if (MACHINE_HAS_IEEE) - asm volatile("sfpc %0,%0" : : "d" (0)); + asm volatile("sfpc %0" : : "d" (0)); } /*