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([2a01:e34:ed2f:f020:5ebd:8bd9:d549:4211]) by smtp.googlemail.com with ESMTPSA id l12sm17306282wro.32.2021.06.21.03.18.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Jun 2021 03:18:39 -0700 (PDT) Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64 To: Will Deacon Cc: Chanwoo Choi , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marek Szyprowski , Krzysztof Kozlowski , Krzysztof Kozlowski , Thomas Gleixner References: <20210608154341.10794-1-will@kernel.org> <20210608154341.10794-2-will@kernel.org> <466bfc19-2260-87c6-c458-b43cf23617e3@samsung.com> <2a0181ea-a26e-65e9-16f6-cc233b6b296f@linaro.org> <20210617214748.GC25403@willie-the-truck> <20210621101058.GB28788@willie-the-truck> From: Daniel Lezcano Message-ID: <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> Date: Mon, 21 Jun 2021 12:18:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210621101058.GB28788@willie-the-truck> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/06/2021 12:10, Will Deacon wrote: [ ... ] >>> exynos4_mct_frc_start() is called unconditionally from probe via >>> exynos4_clocksource_init() so as long as the mct probes first, then the >>> arch timer should work, no? The rating shouldn't affect that. >> >> How do you ensure the exynos mct is probed before the arch timer ? >> >> The Makefile provides the right order, but the dependency is implicit. > > Currently, I think it's done by the order of the CPU hotplug notifiers ( > see the hunk of 6282edb72bed which touches cpuhotplug.h). Ah, right. Indeed whatever the DT order, the cpuhotplug order solves the dependency. Chanwoo, are fine with this change ? -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog 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=-5.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 B41CAC48BE5 for ; Mon, 21 Jun 2021 10:20:28 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7817F61003 for ; Mon, 21 Jun 2021 10:20:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7817F61003 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=XzxmqJhCgo2LOs+h1CYNNBVTnSRoOb1qiUKQS7hJF/Y=; b=hsF5UyutOAGLiEQJ4+wDQdaRau K+s3JQ0lPUR2Bvdn4/mVf+JGqSE4yi0jEh5aIEdkHS+Rh0JInGyzbdtfpX6ItPnXnbaItdMslRCc8 Ewv1i4wsQIGhS0Wdtb9kQA/E4VrwvSBvXidZRYCVjJjiqAYj1f61Qoihr0z/QVq7t9ByuYxGQzUSZ YBB6ELCjoSNDI2gy1EDd2Y5iBSwuhZQ1rfPVJZkRhbjSRKh4yZ4FsJAAbkL15zF4tY/yivA38elgJ 16hICj2Huxm6XUwrdDif/Lt3BrxFsgjTo81xGRIZrybyQWpfUOfOtSn94BCOfkRFeBA6zNGX1HLnl DmCoKN0w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lvH13-0034RA-0W; Mon, 21 Jun 2021 10:18:53 +0000 Received: from mail-wm1-x334.google.com ([2a00:1450:4864:20::334]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lvH0t-0034O2-Ih for linux-arm-kernel@lists.infradead.org; Mon, 21 Jun 2021 10:18:45 +0000 Received: by mail-wm1-x334.google.com with SMTP id j21-20020a05600c1c15b02901dde2accccbso2312453wms.4 for ; Mon, 21 Jun 2021 03:18:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=ya2YRW/nzED56MCRGi5j1lR+lJWddJvApZ/VO+dqQDA=; b=E61Mdusml5vmCTP2n/NtNR4w6PRNEe0rEsdApHOUWO0Z1sogDFC4OtfDOKXscttLeq 2afPRcUIxbZGodQhzaNNT7EZCMfRE6i1q7KrbXVYH/9ls6Gls5v2b54NUmOCzd00i08f j5hQGc9S4YQKMRDHGBShBsvjWYmsD5gSNs04FmoRTzcutalYsXckcqdCH5mbXxR+ff+h gd/rL1OAYiiFDMf0qdPXHZPS2NxJdP6j6xDWT1efBSyCaabLzPDLUEs2U/ETNRF+jVpO 8Ftwd/ZMUhjA0DrDdUv4bXin/Z6+e9b5U+Yz3ddbYsm2NfOoa4ou/56jP4Iw39hxDddF OhEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=ya2YRW/nzED56MCRGi5j1lR+lJWddJvApZ/VO+dqQDA=; b=uMVMWgJQaf05X+aLMnrCEqRG8CGNYYgr8xnuF1DsKKHZFojqCeI8NvIY0YssxlA9Ge 6x2vlvm7k99QMpk8DqoQEypyHgAYl9dgXpFMqRIOHDrJoYVvV9gFya76EhnID5bzHyA+ cyR17KYCsBotJKuTswwPJeOcGD4twL8Cp2KiwwfYuOOPvqieyh9gNbQo5y3LjrpIyQKe OBXPzgR7Kzzr0Ne6zxRFm/hlhUgdFlX9CMiDX3seFFRPOQQFCSOi1DiifYQzVfcdvOYO k+gYAG7q59QzmF6HjRowWH75PuXJ/eJWkxxDl8cJ7/X7MSHJgIcEG2q+IUQ1LdLjMVgc BXZg== X-Gm-Message-State: AOAM533VzNQ89d8m9F8NXEnY3rats+8FtIid1sdtpnHXXRhMjRNPBa2Q D6MSTQ7dh/CrdWQilwtfTP/Dpw== X-Google-Smtp-Source: ABdhPJz5ZSW9GtnJopMpgRsUnAq/O51IS5MFfDEonOmcmUx68Ae8ZRmOS2m0xluboNswJK+T+eXXZw== X-Received: by 2002:a7b:c44d:: with SMTP id l13mr7973182wmi.69.1624270720037; Mon, 21 Jun 2021 03:18:40 -0700 (PDT) Received: from ?IPv6:2a01:e34:ed2f:f020:5ebd:8bd9:d549:4211? ([2a01:e34:ed2f:f020:5ebd:8bd9:d549:4211]) by smtp.googlemail.com with ESMTPSA id l12sm17306282wro.32.2021.06.21.03.18.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Jun 2021 03:18:39 -0700 (PDT) Subject: Re: [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64 To: Will Deacon Cc: Chanwoo Choi , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marek Szyprowski , Krzysztof Kozlowski , Krzysztof Kozlowski , Thomas Gleixner References: <20210608154341.10794-1-will@kernel.org> <20210608154341.10794-2-will@kernel.org> <466bfc19-2260-87c6-c458-b43cf23617e3@samsung.com> <2a0181ea-a26e-65e9-16f6-cc233b6b296f@linaro.org> <20210617214748.GC25403@willie-the-truck> <20210621101058.GB28788@willie-the-truck> From: Daniel Lezcano Message-ID: <3ba202d9-a679-834a-685f-12c6f9eb9c38@linaro.org> Date: Mon, 21 Jun 2021 12:18:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210621101058.GB28788@willie-the-truck> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210621_031843_729844_2E812D8B X-CRM114-Status: GOOD ( 13.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjEvMDYvMjAyMSAxMjoxMCwgV2lsbCBEZWFjb24gd3JvdGU6CgpbIC4uLiBdCgo+Pj4gZXh5 bm9zNF9tY3RfZnJjX3N0YXJ0KCkgaXMgY2FsbGVkIHVuY29uZGl0aW9uYWxseSBmcm9tIHByb2Jl IHZpYQo+Pj4gZXh5bm9zNF9jbG9ja3NvdXJjZV9pbml0KCkgc28gYXMgbG9uZyBhcyB0aGUgbWN0 IHByb2JlcyBmaXJzdCwgdGhlbiB0aGUKPj4+IGFyY2ggdGltZXIgc2hvdWxkIHdvcmssIG5vPyBU aGUgcmF0aW5nIHNob3VsZG4ndCBhZmZlY3QgdGhhdC4KPj4KPj4gSG93IGRvIHlvdSBlbnN1cmUg dGhlIGV4eW5vcyBtY3QgaXMgcHJvYmVkIGJlZm9yZSB0aGUgYXJjaCB0aW1lciA/Cj4+Cj4+IFRo ZSBNYWtlZmlsZSBwcm92aWRlcyB0aGUgcmlnaHQgb3JkZXIsIGJ1dCB0aGUgZGVwZW5kZW5jeSBp cyBpbXBsaWNpdC4KPiAKPiBDdXJyZW50bHksIEkgdGhpbmsgaXQncyBkb25lIGJ5IHRoZSBvcmRl ciBvZiB0aGUgQ1BVIGhvdHBsdWcgbm90aWZpZXJzICgKPiBzZWUgdGhlIGh1bmsgb2YgNjI4MmVk YjcyYmVkIHdoaWNoIHRvdWNoZXMgY3B1aG90cGx1Zy5oKS4KCkFoLCByaWdodC4gSW5kZWVkIHdo YXRldmVyIHRoZSBEVCBvcmRlciwgdGhlIGNwdWhvdHBsdWcgb3JkZXIgc29sdmVzIHRoZQpkZXBl bmRlbmN5LgoKQ2hhbndvbywgYXJlIGZpbmUgd2l0aCB0aGlzIGNoYW5nZSA/CgoKLS0gCjxodHRw Oi8vd3d3LmxpbmFyby5vcmcvPiBMaW5hcm8ub3JnIOKUgiBPcGVuIHNvdXJjZSBzb2Z0d2FyZSBm b3IgQVJNIFNvQ3MKCkZvbGxvdyBMaW5hcm86ICA8aHR0cDovL3d3dy5mYWNlYm9vay5jb20vcGFn ZXMvTGluYXJvPiBGYWNlYm9vayB8CjxodHRwOi8vdHdpdHRlci5jb20vIyEvbGluYXJvb3JnPiBU d2l0dGVyIHwKPGh0dHA6Ly93d3cubGluYXJvLm9yZy9saW5hcm8tYmxvZy8+IEJsb2cKCl9fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJu ZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRw Oi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK