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=-9.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 A6B84C46463 for ; Wed, 10 Oct 2018 23:14:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 514DA21524 for ; Wed, 10 Oct 2018 23:14:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZMbd+Rp7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 514DA21524 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727945AbeJKGiV (ORCPT ); Thu, 11 Oct 2018 02:38:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:36658 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727693AbeJKGiU (ORCPT ); Thu, 11 Oct 2018 02:38:20 -0400 Received: from lerouge.suse.de (LFbn-NCY-1-241-207.w83-194.abo.wanadoo.fr [83.194.85.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F0F4520870; Wed, 10 Oct 2018 23:13:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1539213238; bh=oEcKFpRVXQfL21P4sOV7JPx398j1CpI+tG6azrxn02M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZMbd+Rp7v7oZ+1DCMNo/WhSXWt/fJXNVppR1heuVvV0oA0rztk5rD24ruaiNjKrds amYITVkZYFm6/1tcEnLNo3lddSBo4teQ5uobX9s36bk55jVK4ZR2xSvajsZ2iDqoeB EUpaTn5F93IyKgR5mBEkowIY4Xrqim9E25Rtk8bY= From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Sebastian Andrzej Siewior , Peter Zijlstra , "David S . Miller" , Linus Torvalds , Thomas Gleixner , Frederic Weisbecker , "Paul E . McKenney" , Ingo Molnar , Mauro Carvalho Chehab Subject: [RFC PATCH 28/30] softirq: Disable vector on execution Date: Thu, 11 Oct 2018 01:12:15 +0200 Message-Id: <1539213137-13953-29-git-send-email-frederic@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1539213137-13953-1-git-send-email-frederic@kernel.org> References: <1539213137-13953-1-git-send-email-frederic@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Frederic Weisbecker Disable a vector while it is being processed. This prepare for softirq re-entrancy with an obvious single constraint: a vector can't be interrupted by itself. Signed-off-by: Frederic Weisbecker Cc: Ingo Molnar Cc: Sebastian Andrzej Siewior Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Linus Torvalds Cc: David S. Miller Cc: Mauro Carvalho Chehab Cc: Paul E. McKenney --- kernel/softirq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/softirq.c b/kernel/softirq.c index 3efa59e..457bf60 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -357,7 +357,10 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) kstat_incr_softirqs_this_cpu(vec_nr); trace_softirq_entry(vec_nr); + softirq_enabled_nand(BIT(vec_nr)); + barrier(); h->action(h); + softirq_enabled_or(BIT(vec_nr)); trace_softirq_exit(vec_nr); if (unlikely(prev_count != preempt_count())) { pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n", -- 2.7.4