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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E2F4C433FE for ; Tue, 21 Sep 2021 07:10:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 377AD611BD for ; Tue, 21 Sep 2021 07:10:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230092AbhIUHLv (ORCPT ); Tue, 21 Sep 2021 03:11:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48814 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230026AbhIUHLs (ORCPT ); Tue, 21 Sep 2021 03:11:48 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B1E8C061574 for ; Tue, 21 Sep 2021 00:10:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=9748AU+xv9yA5iRuoYyF3xyck6tGVCimuYrTFFAhqBg=; b=lkw9S7Sa4cMQ4ihC/d1kQfWe4d fblFF1DY0wE58ZnTjcyDlzFvW0mSPbW8cBOxmSunoQk4jzE8fPOBgoMt5s9Kodr48GiN3zpKkzmHT ZvKLeJnOA885zPfIfAEDP8qF0GL7oaW3GFgnu9SEcoo/4iw2tW8dtxd9ssPqPuPHsu+XxUGFxNHOV kokl9GffwGK0HZ9LNSoon6KpHYYn2/5dFfgAQbyawbCBr+o2xh3QSLzvNfab8JBR427wBC48Y1lhE IGi9PgbEtdiHepiLqxIweHAe0htfowNnyq3HaGkLZSD4pkvVc6Gm51c2T38jUG4PMK7+0un+fUhfs UFcnDnoA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mSZut-004i1S-DH; Tue, 21 Sep 2021 07:10:12 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 218D5300252; Tue, 21 Sep 2021 09:10:10 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 117862C3EE3EB; Tue, 21 Sep 2021 09:10:10 +0200 (CEST) Date: Tue, 21 Sep 2021 09:10:10 +0200 From: Peter Zijlstra To: Frederic Weisbecker Cc: Catalin Marinas , Will Deacon , LKML , Ard Biesheuvel , James Morse , Quentin Perret , Mark Rutland Subject: Re: [PATCH 1/4] sched/preempt: Prepare for supporting !CONFIG_GENERIC_ENTRY dynamic preemption Message-ID: References: <20210920233237.90463-1-frederic@kernel.org> <20210920233237.90463-2-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210920233237.90463-2-frederic@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 21, 2021 at 01:32:34AM +0200, Frederic Weisbecker wrote: > There is no need to force dynamic preemption to depend on the generic > entry code. The latter is convenient but not mandatory. An architecture > that doesn't support it just need to provide a static call on its > kernel IRQ exit preemption path. True; but at the same time ARM64 is also moving to generic entry. Mark?