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 2DB6CC77B7A for ; Tue, 6 Jun 2023 13:22:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238149AbjFFNWD (ORCPT ); Tue, 6 Jun 2023 09:22:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48238 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235325AbjFFNWA (ORCPT ); Tue, 6 Jun 2023 09:22:00 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65F3910D5 for ; Tue, 6 Jun 2023 06:21:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686057679; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7O+Uogxnv87YjJ34Ig51fjasBxTsbyDg+pu4Vsfmzzw=; b=VnNQm1GFpLZGCCUIheOUtZRScOyAW+AGu2kjADEbldlfq83AoEP64mFHaFVxC49GKpKT7O 1W6dJnQM13a9ScL5APKeQIakwg8i03fgH0DMsvWhbEWwTMqB6tMPrOMgYlHdOEBKgZWNbH Ok266+yCN0+IcPQZEtNWgFmtlVkLDoM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-383-HyeFG2MzN-CBd_rZ_H4JhA-1; Tue, 06 Jun 2023 09:21:12 -0400 X-MC-Unique: HyeFG2MzN-CBd_rZ_H4JhA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E45DA8032FA; Tue, 6 Jun 2023 13:21:11 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.224.217]) by smtp.corp.redhat.com (Postfix) with SMTP id 872689E94; Tue, 6 Jun 2023 13:21:10 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Tue, 6 Jun 2023 15:20:49 +0200 (CEST) Date: Tue, 6 Jun 2023 15:20:47 +0200 From: Oleg Nesterov To: Sebastian Andrzej Siewior Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, "Eric W. Biederman" , Thomas Gleixner Subject: Re: [PATCH 2/2 v2] signal: Don't disable preemption in ptrace_stop() on PREEMPT_RT. Message-ID: <20230606132047.GA16159@redhat.com> References: <20230606085524.2049961-1-bigeasy@linutronix.de> <20230606085524.2049961-3-bigeasy@linutronix.de> <20230606110447.GA7542@redhat.com> <20230606111418.GA906324@hirez.programming.kicks-ass.net> <20230606113853.GC7542@redhat.com> <20230606131621.nbXfkFvG@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230606131621.nbXfkFvG@linutronix.de> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/06, Sebastian Andrzej Siewior wrote: > > v1…v2: > - Extend the comment to note that preemption isn't disabled due to > the lock to make it obvious that the optimisation isn't just > harmful but also pointless. Thanks, Acked-by: Oleg Nesterov