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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 4798AC76192 for ; Thu, 18 Jul 2019 03:08:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20B4721841 for ; Thu, 18 Jul 2019 03:08:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563419298; bh=Yqt/LllpGzMStVbT4HLxLYhzgZMPXuawn64z9mAi6yM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gVnJ86h0cy0RIpvSOnVgknFmIF5fSqBQ7LrhLP8+9grfQF0e0r423Bl8m+KHXogqm P8EYX4DJsxcr/EK7kjydZ5/fN/N9U67THYa3G++P3wdHlIB9ahpngKpBFHkZ3gIVf2 GC/WjIl87LdjW3vEeMSszXbOWq/PuX34EdHFXLao= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390683AbfGRDIR (ORCPT ); Wed, 17 Jul 2019 23:08:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:40108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390648AbfGRDIO (ORCPT ); Wed, 17 Jul 2019 23:08:14 -0400 Received: from localhost (115.42.148.210.bf.2iij.net [210.148.42.115]) (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 A71232077C; Thu, 18 Jul 2019 03:08:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563419293; bh=Yqt/LllpGzMStVbT4HLxLYhzgZMPXuawn64z9mAi6yM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Is/xcaxX6+84JRZSoA8mlNo7dR7sEImaBdESTPdulxOjm9COBF1+DwvfYRb0iz5Fn poz8ah2on+D9DskZJPSJKkgC0987vKGoAEjog/AUK1C142YUuIX9stxLXYWvH+tfXx 79u5suhh9GcJnOyVucJyK3jFtnO/O6j/pDjFaK3I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thomas Gleixner , Marc Zyngier Subject: [PATCH 4.19 31/47] genirq: Fix misleading synchronize_irq() documentation Date: Thu, 18 Jul 2019 12:01:45 +0900 Message-Id: <20190718030051.369338137@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190718030045.780672747@linuxfoundation.org> References: <20190718030045.780672747@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner tglx@linutronix.de commit 1d21f2af8571c6a6a44e7c1911780614847b0253 upstream The function might sleep, so it cannot be called from interrupt context. Not even with care. Signed-off-by: Thomas Gleixner Cc: Marc Zyngier Link: https://lkml.kernel.org/r/20190628111440.189241552@linutronix.de Signed-off-by: Greg Kroah-Hartman --- kernel/irq/manage.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -96,7 +96,8 @@ EXPORT_SYMBOL(synchronize_hardirq); * to complete before returning. If you use this function while * holding a resource the IRQ handler may need you will deadlock. * - * This function may be called - with care - from IRQ context. + * Can only be called from preemptible code as it might sleep when + * an interrupt thread is associated to @irq. */ void synchronize_irq(unsigned int irq) {