From patchwork Mon Jul 15 02:36:04 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiejun Chen X-Patchwork-Id: 258929 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 8EAAB2C0172 for ; Mon, 15 Jul 2013 12:35:21 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753830Ab3GOCfU (ORCPT ); Sun, 14 Jul 2013 22:35:20 -0400 Received: from mail.windriver.com ([147.11.1.11]:50955 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753819Ab3GOCfU (ORCPT ); Sun, 14 Jul 2013 22:35:20 -0400 Received: from ALA-HCA.corp.ad.wrs.com (ala-hca.corp.ad.wrs.com [147.11.189.40]) by mail.windriver.com (8.14.5/8.14.3) with ESMTP id r6F2Z9lv026465 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Sun, 14 Jul 2013 19:35:09 -0700 (PDT) Received: from Linux.corp.ad.wrs.com (128.224.162.214) by ALA-HCA.corp.ad.wrs.com (147.11.189.50) with Microsoft SMTP Server id 14.2.342.3; Sun, 14 Jul 2013 19:35:09 -0700 From: Tiejun Chen To: CC: , , , Subject: [v1][PATCH 1/1] powerpc: to access local paca after hard irq disabled Date: Mon, 15 Jul 2013 10:36:04 +0800 Message-ID: <1373855764-5115-1-git-send-email-tiejun.chen@windriver.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org We can access paca directly after hard interrupt disabled, and this can avoid accessing wrong paca when using get_paca() in preempt case. Signed-off-by: Tiejun Chen --- arch/powerpc/include/asm/hw_irq.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h index ba713f1..10be1dd 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -96,10 +96,11 @@ static inline bool arch_irqs_disabled(void) #endif #define hard_irq_disable() do { \ - u8 _was_enabled = get_paca()->soft_enabled; \ + u8 _was_enabled; \ __hard_irq_disable(); \ - get_paca()->soft_enabled = 0; \ - get_paca()->irq_happened |= PACA_IRQ_HARD_DIS; \ + _was_enabled = local_paca->soft_enabled; \ + local_paca->soft_enabled = 0; \ + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \ if (_was_enabled) \ trace_hardirqs_off(); \ } while(0)