From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754148AbbEKPxo (ORCPT ); Mon, 11 May 2015 11:53:44 -0400 Received: from e06smtp12.uk.ibm.com ([195.75.94.108]:45643 "EHLO e06smtp12.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754096AbbEKPxC (ORCPT ); Mon, 11 May 2015 11:53:02 -0400 From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: mingo@redhat.com, yang.shi@windriver.com, bigeasy@linutronix.de, benh@kernel.crashing.org, paulus@samba.org, akpm@linux-foundation.org, heiko.carstens@de.ibm.com, schwidefsky@de.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, tglx@linutronix.de, David.Laight@ACULAB.COM, hughd@google.com, hocko@suse.cz, ralf@linux-mips.org, herbert@gondor.apana.org.au, linux@arm.linux.org.uk, airlied@linux.ie, daniel.vetter@intel.com, linux-mm@kvack.org, linux-arch@vger.kernel.org, peterz@infradead.org, dahi@linux.vnet.ibm.com Subject: [PATCH v1 14/15] mips: properly lock access to the fpu Date: Mon, 11 May 2015 17:52:19 +0200 Message-Id: <1431359540-32227-15-git-send-email-dahi@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1431359540-32227-1-git-send-email-dahi@linux.vnet.ibm.com> References: <1431359540-32227-1-git-send-email-dahi@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15051115-0009-0000-0000-0000041B5564 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Let's always disable preemption and pagefaults when locking the fpu, so we can be sure that the owner won't change in between. This is a preparation for pagefault_disable() not touching preemption anymore. Signed-off-by: David Hildenbrand --- arch/mips/kernel/signal-common.h | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h index 06805e0..0b85f82 100644 --- a/arch/mips/kernel/signal-common.h +++ b/arch/mips/kernel/signal-common.h @@ -28,12 +28,7 @@ extern void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, extern int fpcsr_pending(unsigned int __user *fpcsr); /* Make sure we will not lose FPU ownership */ -#ifdef CONFIG_PREEMPT -#define lock_fpu_owner() preempt_disable() -#define unlock_fpu_owner() preempt_enable() -#else -#define lock_fpu_owner() pagefault_disable() -#define unlock_fpu_owner() pagefault_enable() -#endif +#define lock_fpu_owner() ({ preempt_disable(); pagefault_disable(); }) +#define unlock_fpu_owner() ({ pagefault_enable(); preempt_enable(); }) #endif /* __SIGNAL_COMMON_H */ -- 2.1.4