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[23.128.96.18]) by mx.google.com with ESMTP id k27si14280252ejs.676.2020.07.07.02.29.30; Tue, 07 Jul 2020 02:29:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=MO7Ppzm9; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727989AbgGGJ1M (ORCPT + 99 others); Tue, 7 Jul 2020 05:27:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727886AbgGGJ1K (ORCPT ); Tue, 7 Jul 2020 05:27:10 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7EF8FC061755; Tue, 7 Jul 2020 02:27:10 -0700 (PDT) Date: Tue, 7 Jul 2020 11:27:07 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1594114028; 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=QLBTzIwDXRw8Ngy3frJIgWMDMydSG5GmWktyqhaqBeo=; b=MO7Ppzm9g4auQbN/35wAZgxdqPFOCGkJIsA1FU6fXW8rDsAD8z98NHJL4EpFs1MWQnqT0Z UX6AaIaphrgEw7cpzAqVHdV0VsaUoT3XlakzRjgZrWgyiuhTEi26xzLuvYLakLjK+w/LZS y6x6ShETS2+aKEkISOeG49AJBOS3SfNknmo3MqnZ2WBEt+9t7LQuw3pNcSQrP+oehQMTwh GXkDJTuKLDh1rQrDqQUH/lmmkyg3VUU5IHG4OmkDnQCxk6LSsFZEv18p4qryygjCNZnEWS VU0O4OxM761HgnjDn8/3wKBniuB2CRFu6m53V+6Tn2EcPUyAZum7sERzjKS2bg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1594114028; 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=QLBTzIwDXRw8Ngy3frJIgWMDMydSG5GmWktyqhaqBeo=; b=qaqbbubx9fvSPosR3yx7SvkqXwsNksqEypCk+pQW1mWQ0c7qkSnxMlduSpzkWLB7IvJMLB 9ZBQWb3vznwTUxCg== From: Sebastian Andrzej Siewior To: Joel Fernandes Cc: Uladzislau Rezki , "Paul E. McKenney" , rcu@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com Subject: Re: [PATCH tip/core/rcu 03/17] rcu/tree: Skip entry into the page allocator for PREEMPT_RT Message-ID: <20200707092707.eos6yiq5t6h7d7ko@linutronix.de> References: <20200624201200.GA28901@paulmck-ThinkPad-P72> <20200624201226.21197-3-paulmck@kernel.org> <20200630164543.4mdcf6zb4zfclhln@linutronix.de> <20200630183534.GG9247@paulmck-ThinkPad-P72> <20200702141216.r4rbt5w3hjzafpgg@linutronix.de> <20200702194506.GA31478@pc636> <20200706194232.GA233429@google.com> <20200706195557.GA24082@pc636> <20200706202949.GB233429@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200706202949.GB233429@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-07-06 16:29:49 [-0400], Joel Fernandes wrote: > Anyway, I think as we discussed on IRC, your proposal will work for both > kernels while allowing us to keep the internal lock as raw. Why can't we use the migrate_disable() and spinlock_t? > thanks, > > - Joel Sebastian