linux-kernel - Re: [PATCH 01/12] PM / core: Add NEVER_SKIP and SMART

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Message-ID: <1545766.cfb3OTroPT@aspire.rjw.lan>
Date:   Tue, 17 Oct 2017 00:07:37 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux Documentation <linux-doc@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kevin Hilman <khilman@...nel.org>,
        Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 01/12] PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags

On Monday, October 16, 2017 8:31:22 AM CEST Greg Kroah-Hartman wrote:
> On Mon, Oct 16, 2017 at 03:29:02AM +0200, Rafael J. Wysocki wrote:
> > +static inline void dev_pm_set_driver_flags(struct device *dev, unsigned int flags)
> > +{
> > +	dev->power.driver_flags = flags;
> > +}
> 
> Should this function just set the specific bit?  Or is it going to be ok
> to set the whole value, meaning you aren't going to care about turning
> on and off specific flags over the lifetime of the driver/device, you
> are just going to set them once and then just test them as needed?

The idea is to set them once and they should not be touched again until
the driver (or device) goes away, so that would be the whole value at once
(and one of the i2c-designware-platdrv patches actually sets multiple flags
in one go).

Thanks,
Rafael