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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 C485AC12002 for ; Wed, 21 Jul 2021 13:25:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6BB4160725 for ; Wed, 21 Jul 2021 13:25:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6BB4160725 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 152D76B0072; Wed, 21 Jul 2021 09:25:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1031B6B0073; Wed, 21 Jul 2021 09:25:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 018B86B0074; Wed, 21 Jul 2021 09:25:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0036.hostedemail.com [216.40.44.36]) by kanga.kvack.org (Postfix) with ESMTP id DA9C56B0072 for ; Wed, 21 Jul 2021 09:25:09 -0400 (EDT) Received: from forelay.prod.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by fograve04.hostedemail.com (Postfix) with ESMTP id 1FC7418ECF for ; Wed, 21 Jul 2021 07:25:39 +0000 (UTC) Received: from smtpin38.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id ACBA118540E3A for ; Wed, 21 Jul 2021 07:25:38 +0000 (UTC) X-FDA: 78385759956.38.50BCD14 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf12.hostedemail.com (Postfix) with ESMTP id E02091001E85 for ; Wed, 21 Jul 2021 07:25:37 +0000 (UTC) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1626852333; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Iu8+bQKCo8fNCNG9lQPM1PkkNDG5So9x/kh82HBSRlM=; b=Bkpm9S2PbfJJh74tkCirVKMg+Sh+JsPXbVc/xBHOGltswQxUpTNB0bTYv3zmZkN2YOhowB nbYVottReMSEiT5KI17lWv8btg12+cEZhAOwM4SYwqO0hI+F0fCHMFPE0fjOiKJzDEg3JX iL1EQXoQU0rk5Tn8B+57eVDG9teriWiS4mBYsBI1rTSa1VdX3kkVDMQcFBdbmCcglodg1B qt72GUaLquMN6RiFFraO1t6Q0ot1wihdAFbVS2vH4hQwJMxU3H6J0Ynbtzq+nv9ij/dbEn n4aK6i5C8AZb9bbVCG+VkoeadMVokPOhGJxRc3kWykJmywDL2aN5dFdiRWVtvQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1626852333; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Iu8+bQKCo8fNCNG9lQPM1PkkNDG5So9x/kh82HBSRlM=; b=nnQ2D9TRJGpZEPuOd1RjNTWxPdMR2VDZ0XaJKCPV+5C+OL/nRo/TQUWWcZHIR/+IVUg7LE RoP//CRDPGyHIwBw== To: Hillf Danton , Paolo Bonzini Cc: Sebastian Andrzej Siewior , "Michael S. Tsirkin" , linux-mm@kvack.org, LKML , Al Viro Subject: Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal() In-Reply-To: <20210721070452.1008-1-hdanton@sina.com> References: <8dfc0ee9-b97a-8ca8-d057-31c8cad3f5b6@redhat.com> <475f84e2-78ee-1a24-ef57-b16c1f2651ed@redhat.com> <20210715102249.2205-1-hdanton@sina.com> <20210716020611.2288-1-hdanton@sina.com> <20210716075539.2376-1-hdanton@sina.com> <20210716093725.2438-1-hdanton@sina.com> <20210718124219.1521-1-hdanton@sina.com> <20210721070452.1008-1-hdanton@sina.com> Date: Wed, 21 Jul 2021 09:25:32 +0200 Message-ID: <87im14cemr.ffs@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=Bkpm9S2P; dkim=pass header.d=linutronix.de header.s=2020e header.b=nnQ2D9TR; spf=pass (imf12.hostedemail.com: domain of tglx@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=tglx@linutronix.de; dmarc=pass (policy=none) header.from=linutronix.de X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: E02091001E85 X-Stat-Signature: 3fw8kjsnjcr7p1uhtqq4aookhz7jpkr6 X-HE-Tag: 1626852337-56011 X-Bogosity: Ham, tests=bogofilter, spamicity=0.002059, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jul 21 2021 at 15:04, Hillf Danton wrote: > > But the preempting waker can not make sense without the waiter who is bloody > special. Why is it so in the first place? Or it is not at all but the race > existing from Monday to Friday. See the large comment in eventfd_poll().