linux-kernel - Re: [PATCH 3/4] PM / devfreq: Add devfreq_governor

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Message-ID: <20190214183009.GA117604@google.com>
Date:   Thu, 14 Feb 2019 10:30:09 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Chanwoo Choi <cwchoi00@...il.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Lukasz Luba <l.luba@...tner.samsung.com>
Subject: Re: [PATCH 3/4] PM / devfreq: Add devfreq_governor_start/stop()

On Thu, Feb 14, 2019 at 11:12:55PM +0900, Chanwoo Choi wrote:
> Hi Matthias,
> 
> Looks good to me for making the function to remove the duplicate code.
> But,  When I just tested the kernel build, following warnings occur
> about devfreq_governor_stop().
> 
> In file included from ./include/linux/devfreq.h:16:0,
>                  from drivers/devfreq/devfreq.c:23:
> drivers/devfreq/devfreq.c: In function ‘devfreq_governor_stop’:
> drivers/devfreq/devfreq.c:619:17: warning: format ‘%s’ expects
> argument of type ‘char *’, but argument 4 has type ‘int’ [-Wformat=]
>    dev_warn(dev, "%s: Governor %s not stopped: %d\n",
>                  ^
> ./include/linux/device.h:1380:22: note: in definition of macro ‘dev_fmt’
>  #define dev_fmt(fmt) fmt
>                       ^
> drivers/devfreq/devfreq.c:619:3: note: in expansion of macro ‘dev_warn’
>    dev_warn(dev, "%s: Governor %s not stopped: %d\n",
>    ^
> drivers/devfreq/devfreq.c:619:17: warning: format ‘%d’ expects a
> matching ‘int’ argument [-Wformat=]
>    dev_warn(dev, "%s: Governor %s not stopped: %d\n",
>                  ^
> ./include/linux/device.h:1380:22: note: in definition of macro ‘dev_fmt’
>  #define dev_fmt(fmt) fmt
>                       ^
> drivers/devfreq/devfreq.c:619:3: note: in expansion of macro ‘dev_warn’
>    dev_warn(dev, "%s: Governor %s not stopped: %d\n",

For some reason the warnings don't pop up in my 4.19 build and I
missed them when compile testing upstream :(

I'll fix the format string in the next version.

Thanks for the review and build test!

Matthias