linux-kernel - Re: Re: [PATCH v2 3/3] driver core: Replace open-coded list_last

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Message-ID: <20200330104340.GO1922688@smile.fi.intel.com>
Date:   Mon, 30 Mar 2020 13:43:40 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Basil Eljuse <Basil.Eljuse@....com>,
        lkft-triage@...ts.linaro.org,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        fntoth@...il.com, Arnd Bergmann <arnd@...db.de>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: Re: [PATCH v2 3/3] driver core: Replace open-coded
 list_last_entry()

On Mon, Mar 30, 2020 at 11:13:21AM +0100, Sudeep Holla wrote:
> On Fri, Mar 27, 2020 at 07:40:25PM +0000, Robin Murphy wrote:
> > On 2020-03-27 5:56 pm, Naresh Kamboju wrote:
> > > The kernel warning noticed on arm64 juno-r2 device running linux
> > > next-20200326 and next-20200327
> >
> > I suspect this is the correct expected behaviour manifesting. If you're
> > using the upstream juno-r2.dts, the power domain being waited for here is
> > provided by SCPI, however unless you're using an SCP firmware from at least
> > 3 years ago you won't actually have SCPI since they switched it to the newer
> > SCMI protocol, which is not yet supported upstream for Juno. See what
> > happened earlier in the log:
> >
> > [    2.741206] scpi_protocol scpi: incorrect or no SCP firmware found
> > [    2.747586] scpi_protocol: probe of scpi failed with error -110
> >
> > Thus this is the "waiting for a dependency which will never appear" case,
> > for which I assume the warning is intentional,
> 
> Is that the case ?
> 
> Previously we used to get the warning:
> "amba xx: ignoring dependency for device, assuming no driver"
> 
> Now we have the kernel warning in addition to the above.
> 
> > since the system is essentially broken (i.e. the hardware/firmware doesn't
> > actually match what the DT describes).
> >
> 
> Not sure if we can term it as "essentially broken". Definitely not 100%
> functional but not broken if the situation like on Juno where SCP firmware
> is fundamental for all OSPM but not essential for boot and other minimum
> set of functionality.
> 
> Either way I am not against the warning, just wanted to get certain things
> clarified myself.

How this warning related to the patch in the subject? Does revert of the patch
gives you no warning? (I will be very surprised).

-- 
With Best Regards,
Andy Shevchenko