From patchwork Sun Nov 1 13:14:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 11872045 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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 30E37C2D0A3 for ; Sun, 1 Nov 2020 13:18:38 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B9AA8208B6 for ; Sun, 1 Nov 2020 13:18:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="SKh9F7sy"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="AbpPC3jR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B9AA8208B6 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-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MClUidSNxk3Rz1hQcBVPEFLOkO5iFStojA1FeJ4Ndyg=; b=SKh9F7syJLoCMwcp72lab4lCe 562miCLWn6RyW/UsW94wilujXuFqDGHj4ZZLVJQRDFeqc2VXoNcCmOALZu9GI4pohOKlF83zbGfUV YmPhOqZlH1lCX+WWLYmY0UG2uEgDEOvvwaFtiuzXj6dNXa6lAiVGtir8AJqRA/YNrBoER6GhPyFdh 8TRt/+rm9Y9K6pjVvUG/7UvAD8CdOQq0MktnMTPruCKV0OjbG+pvcljNCiYngjX+vQ8TYzy3NTGL/ jWH7KTnPkF1tYRMQZdbKN3c6MGZv+oJ0iwiK+I71bretC/UyZT7BQUIZiJAKYjoDDsVjiIT3NDClH WwDgtE9Wg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kZDC6-0003DK-BV; Sun, 01 Nov 2020 13:14:50 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kZDBx-0003AF-Kz for linux-arm-kernel@lists.infradead.org; Sun, 01 Nov 2020 13:14:47 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EF7C52223F; Sun, 1 Nov 2020 13:14:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604236481; bh=soTWofQsk5mAYc7LD8rgr4LwuCJPqqvnbnjj2BQ4Lv4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AbpPC3jRJtGUDsrBTIs6vU0uxT6b0XugBZTWp8j4H4QtNMnPyx5bDQzydbpWjg/Sq BWkYF1nVVXQF27UHiZF5a2Hbzu9O6inWTGx4le9kUnPDV5s87fMkz7fa/FQYtIbT7R 2teNNNDk8PjUWorTLv/7TtppX7JA2JLu4HlOxdoU= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1kZDBv-006QYT-8i; Sun, 01 Nov 2020 13:14:39 +0000 From: Marc Zyngier To: LAK , linux-kernel Subject: [PATCH 2/2] arm64: Mark the recheduling IPI as naked interrupt Date: Sun, 1 Nov 2020 13:14:30 +0000 Message-Id: <20201101131430.257038-3-maz@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201101131430.257038-1-maz@kernel.org> References: <20201101131430.257038-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, tglx@linutronix.de, Valentin.Schneider@arm.com, peterz@infradead.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201101_081441_806478_D2D7529A X-CRM114-Status: GOOD ( 14.09 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Will Deacon , Peter Zijlstra , Catalin Marinas , Thomas Gleixner , Android Kernel Team , Valentin Schneider Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Flag the rescheduling IPI as 'naked', making sure such interrupt doesn't trigger a rescheduling event by itself. Signed-off-by: Marc Zyngier --- arch/arm64/kernel/smp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 82e75fc2c903..6c11be3e74d3 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -993,6 +993,10 @@ void __init set_smp_ipi_range(int ipi_base, int n) ipi_desc[i] = irq_to_desc(ipi_base + i); irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); + + /* The recheduling IPI is special... */ + if (i == IPI_RESCHEDULE) + irq_set_status_flags(ipi_base + i, IRQ_NAKED); } ipi_irq_base = ipi_base;