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 1C644C433F5 for ; Tue, 8 Feb 2022 01:31:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7C08B6B0073; Mon, 7 Feb 2022 20:31:39 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 74A4D6B0075; Mon, 7 Feb 2022 20:31:39 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6112D6B0078; Mon, 7 Feb 2022 20:31:39 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0164.hostedemail.com [216.40.44.164]) by kanga.kvack.org (Postfix) with ESMTP id 4E7D16B0073 for ; Mon, 7 Feb 2022 20:31:39 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 03DD6181F0FFE for ; Tue, 8 Feb 2022 01:31:39 +0000 (UTC) X-FDA: 79117885518.19.13F3B33 Received: from mail-yb1-f177.google.com (mail-yb1-f177.google.com [209.85.219.177]) by imf29.hostedemail.com (Postfix) with ESMTP id AA50D120002 for ; Tue, 8 Feb 2022 01:31:38 +0000 (UTC) Received: by mail-yb1-f177.google.com with SMTP id e145so25382082yba.12 for ; Mon, 07 Feb 2022 17:31:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=tCJweZfHtprqNwQuPKuSEa8equXJDKCDWHoJe/Xk+94=; b=fmLm2+b0Vi8fyFlno+sBzlvxdiOinqMMSjhhIC3lIyAfleRXnfHq74bS8lB/mSNU8r 6jXDw5garFcyc7Ibtr6uEe4zrLDIHhuXcAVhvSYY8XJk0M9XM2O4lmcd1N9IThzroYpZ GucSNu7NmuuXNL0Ogw6Vd9IvU1Z5hyTPnJEJgWN+khl8OBW3dRCn4iHISMga3oykiq7U /odbVMN5shA5S6T1+BhLTqlF1xEgfnx7Wvx7GmHCeL4ye0G2pCRNhk1L4EJTbXHbPAWc Dgyv9VK9aMkYe5wpKd+SpryQ89VHUSyQubkEYPIopT0zcrKn5+/SeOfDcTM6mu4ZSSTC OYUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=tCJweZfHtprqNwQuPKuSEa8equXJDKCDWHoJe/Xk+94=; b=5uXn3h8YyGkYTMXOEcP/qNlwOQAR6gudOXyaJ4XeKUno6E2BoLfH0A2Iib44htdp7B prAG2l27OCrsXDxsIGiH132pT2EqwyXmoZSyYLd02HiIVdCBxi8yr7ehE4Kh8SMcbya/ Zf54ANCIwXSad2hSchS559uHWuH1lL7+Pd1xwts8NxyejBJWNg3wgvLPyYQJlAXSRLaa u6uRgA61RtjRCpclbQF/0y+6vXK1ymnM48Wcuau9k4BCSpTAoiUdtAkz2Srz5HLw935V ZvWdC9tjDLFrq/NGmfvB0vEgri2ahboofPccJEXIY2dEHEur8WngYdRUVPurnLpabISB 2kyg== X-Gm-Message-State: AOAM531QBPIxrmeh8ILZhQaxxma9JngcrmbOxkMlXYof+Kn6BVwKBYXq G/8RF5ATQdhXd6oJ0cfVjqQ8ar/7s+OGZFZU+juffg== X-Google-Smtp-Source: ABdhPJx2mKqMDRjehybx6rXQuL9bFCnGNeOOYN9Q7Az3jEMiEEcSFx0PdKX3wUIXfBWRwy8D1KGwzva4m8d0S9EV95E= X-Received: by 2002:a25:7a47:: with SMTP id v68mr2663451ybc.488.1644283897723; Mon, 07 Feb 2022 17:31:37 -0800 (PST) MIME-Version: 1.0 References: <20220128131006.67712-1-michel@lespinasse.org> <20220128131006.67712-23-michel@lespinasse.org> <20220129121319.3593-1-hdanton@sina.com> <20220201020958.3720-1-hdanton@sina.com> <20220208002059.2670-1-hdanton@sina.com> In-Reply-To: <20220208002059.2670-1-hdanton@sina.com> From: Suren Baghdasaryan Date: Mon, 7 Feb 2022 17:31:26 -0800 Message-ID: Subject: Re: [PATCH v2 22/35] percpu-rwsem: enable percpu_sem destruction in atomic context To: Hillf Danton Cc: Michel Lespinasse , Linux-MM , LKML Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: o61wzg5rnh8o9hwmhy5mrgz9fn7obm7g X-Rspam-User: Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=fmLm2+b0; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf29.hostedemail.com: domain of surenb@google.com designates 209.85.219.177 as permitted sender) smtp.mailfrom=surenb@google.com X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: AA50D120002 X-HE-Tag: 1644283898-491864 X-Bogosity: Ham, tests=bogofilter, spamicity=0.029355, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Feb 7, 2022 at 4:21 PM Hillf Danton wrote: > > On Mon, 7 Feb 2022 11:31:38 -0800 Suren Baghdasaryan wrote: > > > > Sorry for the delay. Are you concerned about the use of spin_lock() > > inside percpu_rwsem_async_destroy() which would become a sleeping lock > > in case of PREEMPT_RT? If so, we can use raw_spin_lock() when locking > > destroy_list_lock. Please confirm. Thanks! > > Yes please replace spin lock with the raw version which can fit in > more scenarios. Thanks for confirmation! I'll rework my patch and will send it to Michel to include in the next version of his patchset. > > Hillf >