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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 A892DC4741F for ; Sun, 1 Nov 2020 13:14:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 59BA620870 for ; Sun, 1 Nov 2020 13:14:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604236484; bh=soTWofQsk5mAYc7LD8rgr4LwuCJPqqvnbnjj2BQ4Lv4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=K+4csX8Qvi4lffdbvOHOiUgEeQX6kFGz/tLnceF8mptmzfhztnrb89ae8OGH4yG8b ioTxQi79j0bFElWS1q6SVB4hOsU3Tj5CUGUlEXuopi2hoGbnWYj4c4JXo10f/erJW7 OmIXLiZemRx0fhB15vPDsNqgl8FlOqUWnwf7MpDI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726739AbgKANOn (ORCPT ); Sun, 1 Nov 2020 08:14:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:57138 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726610AbgKANOl (ORCPT ); Sun, 1 Nov 2020 08:14:41 -0500 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 Cc: Will Deacon , Catalin Marinas , Thomas Gleixner , Valentin Schneider , Peter Zijlstra , Android Kernel Team 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 Content-Transfer-Encoding: 8bit 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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; -- 2.28.0