From patchwork Mon Mar 11 22:47:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Valentin Schneider X-Patchwork-Id: 10848397 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6AC72139A for ; Mon, 11 Mar 2019 22:48:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 567AB2931A for ; Mon, 11 Mar 2019 22:48:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4A9052934A; Mon, 11 Mar 2019 22:48:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 865F329339 for ; Mon, 11 Mar 2019 22:48:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726606AbfCKWsQ (ORCPT ); Mon, 11 Mar 2019 18:48:16 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:33932 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726619AbfCKWsP (ORCPT ); Mon, 11 Mar 2019 18:48:15 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F38F3A78; Mon, 11 Mar 2019 15:48:14 -0700 (PDT) Received: from e113632-lin.cambridge.arm.com (e113632-lin.cambridge.arm.com [10.1.194.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B7FBC3F59C; Mon, 11 Mar 2019 15:48:13 -0700 (PDT) From: Valentin Schneider To: linux-kernel@vger.kernel.org Cc: Ralf Baechle , Paul Burton , James Hogan , linux-mips@vger.kernel.org Subject: [PATCH 06/14] MIPS: entry: Remove unneeded need_resched() loop Date: Mon, 11 Mar 2019 22:47:44 +0000 Message-Id: <20190311224752.8337-7-valentin.schneider@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190311224752.8337-1-valentin.schneider@arm.com> References: <20190311224752.8337-1-valentin.schneider@arm.com> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since the enabling and disabling of IRQs within preempt_schedule_irq() is contained in a need_resched() loop, we don't need the outer arch code loop. Do note that commit a18815abcdfd ("Use preempt_schedule_irq.") initially removed the existing loop, but commit cdaed73afb61 ("Fix preemption bug.") reintroduced it. It is however not clear what the issue was and why such a loop was reintroduced, so I'm probably missing something. Signed-off-by: Valentin Schneider Cc: Ralf Baechle Cc: Paul Burton Cc: James Hogan Cc: linux-mips@vger.kernel.org --- arch/mips/kernel/entry.S | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S index d7de8adcfcc8..2240faeda62a 100644 --- a/arch/mips/kernel/entry.S +++ b/arch/mips/kernel/entry.S @@ -58,7 +58,6 @@ resume_kernel: local_irq_disable lw t0, TI_PRE_COUNT($28) bnez t0, restore_all -need_resched: LONG_L t0, TI_FLAGS($28) andi t1, t0, _TIF_NEED_RESCHED beqz t1, restore_all @@ -66,7 +65,7 @@ need_resched: andi t0, 1 beqz t0, restore_all jal preempt_schedule_irq - b need_resched + j restore_all #endif FEXPORT(ret_from_kernel_thread)