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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7656AC05027 for ; Mon, 6 Feb 2023 06:43:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E0D1A6B0074; Mon, 6 Feb 2023 01:43:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DBD816B007B; Mon, 6 Feb 2023 01:43:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CABBE6B007E; Mon, 6 Feb 2023 01:43:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id BA97D6B0074 for ; Mon, 6 Feb 2023 01:43:23 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 8CB381C6337 for ; Mon, 6 Feb 2023 06:43:23 +0000 (UTC) X-FDA: 80435925486.23.3B423E9 Received: from r3-19.sinamail.sina.com.cn (r3-19.sinamail.sina.com.cn [202.108.3.19]) by imf06.hostedemail.com (Postfix) with ESMTP id 01462180014 for ; Mon, 6 Feb 2023 06:43:20 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf06.hostedemail.com: domain of hdanton@sina.com designates 202.108.3.19 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1675665802; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+lCWIjW5XIIU835m6wx0XXbBcGD1MfQRodzFWleIZoE=; b=2AwsVa2vFL2DjsNkC22Ao44ShvJmKPjKrOG2KRgoegyfvedzDldw6vKNhFnobp8tfsBtFm Cl99brFTDzPRZkPigOqjaL9D1WrZ8g4orSnNdMOyWJIqG65hohXf0VdKh3XS2iZjBGFSoS Ett5V3n+MfXp9xhzUfYeTy7rSugcxDY= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf06.hostedemail.com: domain of hdanton@sina.com designates 202.108.3.19 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1675665802; a=rsa-sha256; cv=none; b=YXsDJT3PPltLw3irdnAA8PL1gdVrc98tW+BdqoupnI30/ARcwsKKyxHcUIq0ujMPIi9ZUH HcQ7XWnpFAl/kqDtj6237+1p6nEy99reGxA+mShIlLmEvymKqFFZS4YssCiQa/jm3rc8ou otqMI+LQdsaP47w+BUOmApc+Xzkl0DE= Received: from unknown (HELO localhost.localdomain)([114.249.61.130]) by sina.com (172.16.97.35) with ESMTP id 63E0A09C000074FE; Mon, 6 Feb 2023 14:39:26 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 29847715073502 From: Hillf Danton To: Greg Kroah-Hartman Cc: Alan Stern , Tetsuo Handa , "Rafael J. Wysocki" , linux-mm@kvack.org, LKML , USB list , Linus Torvalds Subject: Re: Converting dev->mutex into dev->spinlock ? Date: Mon, 6 Feb 2023 14:43:05 +0800 Message-Id: <20230206064305.1838-1-hdanton@sina.com> In-Reply-To: References: <28a82f50-39d5-a45f-7c7a-57a66cec0741@I-love.SAKURA.ne.jp> <917e1e3b-094f-e594-c1a2-8b97fb5195fd@I-love.SAKURA.ne.jp> <20230206025629.1786-1-hdanton@sina.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 01462180014 X-Stat-Signature: mwarwms3ibs758ro6rqnx9emkhfpo3cn X-HE-Tag: 1675665800-275107 X-HE-Meta: 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 jStvw0tQ JvELnpe/ZJHoFmEwSY1UPfmTpNCdS1iZ7LKoh1sq1t3TjpXydGprPNU5FlbHpjdZzfN0x6gJ+CUdcwXpn+GEKoeH4pOQX3SYgPB7G6blzI1m5U7G2s+txlQl3cGA1Bp3B6D8PIpZGgCDkaZi07rMKrzbIEMUwn9brU+iKuPzichl5alQwTEozj/YY0SoFHs1RQODwZh3P7Gh9uJhUBwMMLzjTyGdUpEZ1ms+i1zb6V2wg4aArRppzSuWVDg8UjF1qmYVVtrCQk+Vv5QQtXVaTC5lYcez/TncyISPy X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 6 Feb 2023 06:17:03 +0100 Greg Kroah-Hartman > On Mon, Feb 06, 2023 at 10:56:29AM +0800, Hillf Danton wrote: > > On Sun, 5 Feb 2023 11:46:06 -0500 Alan Stern > > > > > > And by the way, by disabling lockdep validation I am declaraing that > > > enabling it would cause an overwhelming number of false positives, > > > > Could you share 5 false positives you see upstream to help understand how > > it is useless? > > Please see this other email in this thread: > https://lore.kernel.org/r/Y98FLlr7jkiFlV0k@rowland.harvard.edu What lockdep warnings? Specific examples, please.