linux-kernel - Re: [PATCH 1/4] driver core: Use subdir-ccflags-* to inherit debug flag

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Date:   Wed, 10 Feb 2021 11:42:03 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Yicong Yang <yangyicong@...ilicon.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, jdelvare@...e.com,
        linux@...ck-us.net, giometti@...eenne.com, abbotti@....co.uk,
        hsweeten@...ionengravers.com, kw@...ux.com, helgaas@...nel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-hwmon@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kbuild@...r.kernel.org, masahiroy@...nel.org,
        michal.lkml@...kovi.net, linuxarm@...neuler.org,
        prime.zeng@...wei.com
Subject: Re: [PATCH 1/4] driver core: Use subdir-ccflags-* to inherit debug
 flag

On Mon, Feb 08, 2021 at 09:09:20PM +0800, Yicong Yang wrote:
> On 2021/2/8 18:47, Greg KH wrote:
> > On Mon, Feb 08, 2021 at 06:44:52PM +0800, Yicong Yang wrote:
> >> On 2021/2/5 17:53, Greg KH wrote:
> >>> What does this offer in benefit of the existing way?  What is it fixing?
> >>> Why do this "churn"?
> >>
> >> currently we have added ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG in the Makefile
> >> of driver/base and driver/base/power, but not in the subdirectory
> >> driver/base/firmware_loader. we cannot turn the debug on for subdirectory
> >> firmware_loader if we config DEBUG_DRIVER and there is no kconfig option
> >> for the it.
> > 
> > Is that necessary?  Does that directory need it?
> 
> there are several debug prints in firmware_loader/main.c:
> 
> ./main.c:207:   pr_debug("%s: fw-%s fw_priv=%p\n", __func__, fw_name, fw_priv);
> ./main.c:245:                   pr_debug("batched request - sharing the same struct fw_priv and lookup for multiple requests\n");
> <snip>

Even if these are not in scope for CONFIG_DEBUG_DRVIER there is a
config option that would allow you to observe them without changing
any code (CONFIG_DYNAMIC_DEBUG).


Daniel.