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

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Date:   Mon, 8 Feb 2021 11:47:19 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yicong Yang <yangyicong@...ilicon.com>
Cc:     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 06:44:52PM +0800, Yicong Yang wrote:
> Hi Greg,
> 
> On 2021/2/5 17:53, Greg KH wrote:
> > On Fri, Feb 05, 2021 at 05:44:12PM +0800, Yicong Yang wrote:
> >> From: Junhao He <hejunhao2@...ilicon.com>
> >>
> >> Use subdir-ccflags-* instead of ccflags-* to inherit the debug
> >> settings from Kconfig when traversing subdirectories.
> > 
> > That says what you do, but not _why_ you are doing it.
> 
> i'll illustrate the reason and reword the commit.
> 
> > 
> > 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?

thanks,

greg k-h