From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58C78C433DB for ; Mon, 18 Jan 2021 14:15:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 24DB722B39 for ; Mon, 18 Jan 2021 14:15:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392829AbhAROPv (ORCPT ); Mon, 18 Jan 2021 09:15:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:42562 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392737AbhARON7 (ORCPT ); Mon, 18 Jan 2021 09:13:59 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1FD8022CA0; Mon, 18 Jan 2021 14:12:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1610979166; bh=DPcFSuOJj5EPa3HsRHn5XhRjCMb0tvC8HxGOg34yolY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZGyDcz5nFUKwOx22mg51NAIXO4AJqIUY5rBtUBH3LiOD633XhJLAzjR4nPxArzu65 59mhzVx7CVUm9xAlPd1MNMW1JuNkQVDNUoe0g3aVtcGLAl2KUEbTOD1O3DKXz6L/uo maF2auila/+SE66czTIPYpkcF1ENRt03jK1wkHpIOMVtLuj2poEaLyilyNxv5xKCUt n0pUgwQ/m1iio3HhKXYjTD/abvthkmKMvHQ2LIpW82R84xP6JOKeyQSfbAA0vWR2xU +1JSIP+Cb6Y2nvMyW/ICwqxG57ncdb2+h6tlSq3T3//jIkLG0AUo9XB2871XqiLvBR 0XzXVk1TNZHmg== From: Frederic Weisbecker To: Peter Zijlstra Cc: LKML , Mel Gorman , Michal Hocko , Frederic Weisbecker , Thomas Gleixner , "Paul E . McKenney" , Ingo Molnar , Michal Hocko Subject: [RFC PATCH 7/8] preempt/dynamic: Provide irqentry_exit_cond_resched() static call Date: Mon, 18 Jan 2021 15:12:22 +0100 Message-Id: <20210118141223.123667-8-frederic@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210118141223.123667-1-frederic@kernel.org> References: <20210118141223.123667-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Peter Zijlstra (Intel)" Provide static call to control IRQ preemption (called in CONFIG_PREEMPT) so that we can override its behaviour when preempt= is overriden. Since the default behaviour is full preemption, its call is initialized to provide IRQ preemption when preempt= isn't passed. Signed-off-by: Peter Zijlstra (Intel) Cc: Thomas Gleixner Cc: Mel Gorman Cc: Ingo Molnar Cc: Michal Hocko Cc: Paul E. McKenney Signed-off-by: Frederic Weisbecker --- include/linux/entry-common.h | 4 ++++ kernel/entry/common.c | 10 +++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h index ca86a00abe86..1401c93b65e1 100644 --- a/include/linux/entry-common.h +++ b/include/linux/entry-common.h @@ -2,6 +2,7 @@ #ifndef __LINUX_ENTRYCOMMON_H #define __LINUX_ENTRYCOMMON_H +#include #include #include #include @@ -453,6 +454,9 @@ irqentry_state_t noinstr irqentry_enter(struct pt_regs *regs); * Conditional reschedule with additional sanity checks. */ void irqentry_exit_cond_resched(void); +#ifdef CONFIG_PREEMPT_DYNAMIC +DECLARE_STATIC_CALL(irqentry_exit_cond_resched, irqentry_exit_cond_resched); +#endif /** * irqentry_exit - Handle return from exception that used irqentry_enter() diff --git a/kernel/entry/common.c b/kernel/entry/common.c index 378341642f94..84fa7ec28c36 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -393,6 +393,9 @@ void irqentry_exit_cond_resched(void) preempt_schedule_irq(); } } +#ifdef CONFIG_PREEMPT_DYNAMIC +DEFINE_STATIC_CALL(irqentry_exit_cond_resched, irqentry_exit_cond_resched); +#endif noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state) { @@ -419,8 +422,13 @@ noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state) } instrumentation_begin(); - if (IS_ENABLED(CONFIG_PREEMPTION)) + if (IS_ENABLED(CONFIG_PREEMPTION)) { +#ifdef CONFIG_PREEMT_DYNAMIC + static_call(irqentry_exit_cond_resched)(); +#else irqentry_exit_cond_resched(); +#endif + } /* Covers both tracing and lockdep */ trace_hardirqs_on(); instrumentation_end(); -- 2.25.1