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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 BC593ECE599 for ; Wed, 16 Oct 2019 23:31:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 830EC21848 for ; Wed, 16 Oct 2019 23:31:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571268698; bh=A/VXXDacx1kqou9nKcw4GFqVfJ7tLFJBU2hTwpNlA5I=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=AXR12M2qm6pCW/8D4bTSo6a2nh2N3KN/IBiJUyDcjR7QBNb9LaLiq0XBaIg86MD0o n7B0CawvZHh2CLbCaE15hs0Mv09ovQaR3fpEs/MwZ5Q/UFZiAQLHLvHASQGJATc8DP RzFb+DNSU1ht+YmkgigqOrqkSGrYJw6q324psVG8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395469AbfJPXbh (ORCPT ); Wed, 16 Oct 2019 19:31:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:54762 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391320AbfJPXbh (ORCPT ); Wed, 16 Oct 2019 19:31:37 -0400 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DDAED21848 for ; Wed, 16 Oct 2019 23:31:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571268696; bh=A/VXXDacx1kqou9nKcw4GFqVfJ7tLFJBU2hTwpNlA5I=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=dlspdCHU4LVIcAl2JPk400LYQA5S+LGk7Svch78fix1ZXCXq0LV1GnbJVhx/1maLg euO+Fup7/lpvRgZE+lDJG1MaE1ru4gSfEOt1c19gNxyScHuL4kT1Hea1lzrpbuKo3q PEdmC20NvGxNP5Msq2ziP+8CHpGBYlIFirTalLTg= Received: by mail-wm1-f49.google.com with SMTP id 7so547968wme.1 for ; Wed, 16 Oct 2019 16:31:35 -0700 (PDT) X-Gm-Message-State: APjAAAUirlTzv7ItfzJ824F44fR1bg05ZTun8Vl1DBzd+NOEzQFRAOWJ unj/lxahDlwGsuxvtmba5JYTx0dKd18h+EChrqE= X-Google-Smtp-Source: APXvYqzSBdJDlHGHj8485OYT1LMO8jDZplpDh6E5wbK61+sx45sTIorAXDjQ6YVUdCRXR4Mjeg4Q27c2e7ZW7GipVew= X-Received: by 2002:a05:600c:2387:: with SMTP id m7mr141611wma.137.1571268694414; Wed, 16 Oct 2019 16:31:34 -0700 (PDT) MIME-Version: 1.0 References: <20191015191821.11479-1-bigeasy@linutronix.de> <20191015191821.11479-7-bigeasy@linutronix.de> <20191016073905.yv4xqoovrdrnrbp7@linutronix.de> In-Reply-To: <20191016073905.yv4xqoovrdrnrbp7@linutronix.de> From: Guo Ren Date: Thu, 17 Oct 2019 07:31:23 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 06/34] csky: Use CONFIG_PREEMPTION To: Sebastian Andrzej Siewior Cc: Linux Kernel Mailing List , tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Thx for explanation. Acked-by: Guo Ren On Wed, Oct 16, 2019 at 3:39 PM Sebastian Andrzej Siewior wrote: > > On 2019-10-16 07:29:34 [+0800], Guo Ren wrote: > > Could CONFIG_PREEMPT_RT be supported in csky ? Any arch backend porting ? > > It could. HIGH_RES_TIMERS is useful and IRQ_FORCED_THREADING is > required. You already have PREEMPT(ION) which is good. Then you would > have to try and my guess would be that some of spinlock_t vs > raw_spinlock_t could require changes but we should have lockdep support > for that which would make things easier. > > Sebastian -- Best Regards Guo Ren ML: https://lore.kernel.org/linux-csky/