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_PASS autolearn=ham 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 60B92C282C4 for ; Tue, 12 Feb 2019 18:07:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 23D49222C4 for ; Tue, 12 Feb 2019 18:07:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549994865; bh=YrKT1zNVzC8Qchj/pTrQ2mu2n8S+mGtIC7fpSQEAbNI=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=qs4tCoNYVD490I4eWIVHLFxkPNh4wocJqt/QgTr+YxhGZvMJ5ZsVbn4AJtbBgyKAA ivHtLA7KQEX+QWjo3sVSu0OwETYdnT13bjjD8QBE9nIOm33doTp1CXlkXcdL90E6ft jhVyiFpsq6t/H/e33AvMOhfqL2+Sgc7SedUkv4H4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731759AbfBLSHn (ORCPT ); Tue, 12 Feb 2019 13:07:43 -0500 Received: from mail-ot1-f68.google.com ([209.85.210.68]:43772 "EHLO mail-ot1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727843AbfBLSHn (ORCPT ); Tue, 12 Feb 2019 13:07:43 -0500 Received: by mail-ot1-f68.google.com with SMTP id n71so5972895ota.10; Tue, 12 Feb 2019 10:07:42 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YrKT1zNVzC8Qchj/pTrQ2mu2n8S+mGtIC7fpSQEAbNI=; b=cs/pRwhypoohaCtGEEPWQDjkJAejZbRDlUDV4gqRqXXAgvJX0Su65twRrHKfC7tMlg qRbDbeWo325cA1BmBDKSCTjJMvWPypTNdF/g24Wow78IwN4yP057e2NJPgflPgstzMJq /JkX4robFYlI5/lFtbxTHqHIBgiYU1tLTi7/EG+wNVNdESM2myrQxpxVD69gdpKOwDJQ 39MTHRVVBC6fGhgn/ZbbjjsRoU+K3CRM26SMmXeKFasWG1hkmS5RrhtQu4CNog0zNl+c T5DhtyjOCL2itu6pEKTqYyNMmXRIYlWrot6z5IjmKMTdm7yk/C77efgtjvKFMtyVWuat hByw== X-Gm-Message-State: AHQUAuavZTcvWNxhhNwQghZ9K2luSHoicvg5+mYIAX6CGngT5su2EQXy /fLPW2efwqIRKUoR2fnRpv9Da69Wz9q1b0gooGU= X-Google-Smtp-Source: AHgI3IaXGqONaDGh+m+HBINh6oMl+KCZK0QmWoHRHVXhQfNKvUN1dD3ygDH7wSqJ4SW7uokZFsC03ieufEW+Hzl3Dk0= X-Received: by 2002:a05:6830:2005:: with SMTP id e5mr5262974otp.258.1549994862128; Tue, 12 Feb 2019 10:07:42 -0800 (PST) MIME-Version: 1.0 References: <20190206150935.12140-1-sudeep.holla@arm.com> <20190207103600.GA14464@e107155-lin> <20190207150638.GB14464@e107155-lin> <20190207152908.GC14464@e107155-lin> <20190212174937.GA19095@e107155-lin> In-Reply-To: <20190212174937.GA19095@e107155-lin> From: "Rafael J. Wysocki" Date: Tue, 12 Feb 2019 19:07:31 +0100 Message-ID: Subject: Re: [PATCH] drivers: base: add support to skip power management in device/driver model To: Sudeep Holla Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Linux PM , Greg Kroah-Hartman , "Rafael J. Wysocki" , Jisheng Zhang , Ulf Hansson , Steve Longerbeam , Eugeniu Rosca , Joshua Frkuska , Eugeniu Rosca 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 On Tue, Feb 12, 2019 at 6:49 PM Sudeep Holla wrote: > > On Mon, Feb 11, 2019 at 05:20:20PM +0100, Ulf Hansson wrote: > > On Thu, 7 Feb 2019 at 16:29, Sudeep Holla wrote: > > > > > > On Thu, Feb 07, 2019 at 04:18:57PM +0100, Ulf Hansson wrote: > > > > On Thu, 7 Feb 2019 at 16:06, Sudeep Holla wrote: > > > > > > [...] > > > > > > > > Indeed, I was ignoring knowing that it's harmless. But more people > > > > > started to complain, and Rafael suggested this which I agree as we > > > > > have several pseudo devices created in the kernel that we can bypass > > > > > some of these pm handling knowing we won't need it. > > > > > > > > Okay, I see. > > > > > > > > Anyway, I will likely need to restore part of this change, via my > > > > cluster idling series then. As from that point, the cpu device that > > > > you call device_set_pm_not_required() for, starts to be used from both > > > > PM core and runtime PM point of view. But I guess that's okay then. > > > > > > > > > > Ah I see. I can drop for CPU devices then. Since I didn't see any use for > > > them, I set the flag, but I can drop it now or you can do that as part > > > of that series. > > > > Well, I prefer if you drop it for CPU devices, as least for now. > > > > > There are quite a few devices(especially the ones > > > registered under system subsys can set this but I would take it separate > > > once we settle on this). Also Rafael may have seen use for few more > > > devices when he suggested this. > > > > Yep, let's find another first user of this. > > > > Additionally, it seems like we should drop the print in device_pm_add(). > > > > Hi Rafael, > > Do you prefer to drop the error message or retain it as is ? Do you mean the one in device_pm_add()? > With this patch, we don't have to. I will repost v2 dropping this flags for cpus > and just retaining the cache nodes for now. OK