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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B316C433EF for ; Fri, 20 May 2022 09:19:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347602AbiETJTJ (ORCPT ); Fri, 20 May 2022 05:19:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347653AbiETJTI (ORCPT ); Fri, 20 May 2022 05:19:08 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 204098CCEF; Fri, 20 May 2022 02:19:06 -0700 (PDT) Date: Fri, 20 May 2022 11:19:02 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1653038344; 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=KWPubtkvQ2aCZReywxCS4p4fahrxBl0TxS5i1kN1rQo=; b=gszbfQ6zI4nXwPJMDIOmIvbGJFBZwp7oLxEadOjquG+OVYnR3Ge7ZAFW7beHrFP5E39bA3 mMt0ZIiuaKlWdu1X/phpLUyYl5eCIYcfLJFdXTBJ2CQzA0NS/gSdgixkSRcqtcOdX8qPlQ egaskZ3eqGPOyjvpABCn0ocGnlQqBGgRtpvNyiIheym7rYJ4DFJdF+YuvTXB6SakmKAEhg TQHAHVkmxTCcl707FX5wL1CL+kRpvyX4zAs22iPpUZwdTxf62SS+EKZV4kf3/l9B5TYiYv OLuXSWgvAHtHTTAev5t+P7kzoIK9GTj4sC0/goB2g+ZKi+n5tm20si1RksABKg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1653038344; 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=KWPubtkvQ2aCZReywxCS4p4fahrxBl0TxS5i1kN1rQo=; b=c2VdbW/XNEh+SkoJfHvsYMpGLND9/MSvmYh3p6cn2VPhVlrTN7OQ9dQVPzZE+VQ9Ws5wJG sNmUjAxyeWk5FYDQ== From: Sebastian Andrzej Siewior To: "Eric W. Biederman" Cc: linux-kernel@vger.kernel.org, rjw@rjwysocki.net, oleg@redhat.com, mingo@kernel.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, mgorman@suse.de, Will Deacon , tj@kernel.org, linux-pm@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Jann Horn , Kees Cook , linux-ia64@vger.kernel.org, Robert O'Callahan , Kyle Huey , Richard Henderson , Ivan Kokshaysky , Matt Turner , Jason Wessel , Daniel Thompson , Douglas Anderson , Douglas Miller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras Subject: Re: [PATCH 00/16] ptrace: cleanups and calling do_cldstop with only siglock Message-ID: References: <20220421150248.667412396@infradead.org> <20220421150654.817117821@infradead.org> <87czhap9dy.fsf@email.froward.int.ebiederm.org> <878rrrh32q.fsf_-_@email.froward.int.ebiederm.org> <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> <87k0b0apne.fsf_-_@email.froward.int.ebiederm.org> <87a6bv6dl6.fsf_-_@email.froward.int.ebiederm.org> <871qwq5ucx.fsf_-_@email.froward.int.ebiederm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <871qwq5ucx.fsf_-_@email.froward.int.ebiederm.org> Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On 2022-05-18 17:49:50 [-0500], Eric W. Biederman wrote: > After this set of changes only cgroup_enter_frozen should remain a > stumbling block for PREEMPT_RT in the ptrace_stop path. Yes, I can confirm that. I have no systemd-less system at hand which means I can't boot a kernel without CGROUP support. But after removing cgroup_{enter|leave}_frozen() in ptrace_stop() I don't see the problems I saw earlier. Sebastian