linux-kernel - Re: [PATCH v2 2/4] hwmon: Use subdir-ccflags-* to inherit debug flag

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Date:   Tue, 9 Feb 2021 07:06:58 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Yicong Yang <yangyicong@...ilicon.com>
Cc:     gregkh@...uxfoundation.org, jdelvare@...e.com,
        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, prime.zeng@...wei.com,
        linuxarm@...neuler.org
Subject: Re: [PATCH v2 2/4] hwmon: Use subdir-ccflags-* to inherit debug flag

On Tue, Feb 09, 2021 at 07:08:17PM +0800, Yicong Yang wrote:
> From: Junhao He <hejunhao2@...ilicon.com>
> 
> We use ccflags-$(CONFIG_HWMON_DEBUG_CHIP) for the debug
> message in drivers/hwmon, but the DEBUG flag will not pass to
> the subdirectory.
> 
> Considering CONFIG_HWMON_DEBUG_CHIP intends to have DEBUG
> recursively in driver/hwmon. It will be clearer
> to use subdir-ccflags-* instead of ccflags-* to inherit
> the debug settings from Kconfig when traversing subdirectories,
> and it will avoid omittance of DEBUG define when debug messages
> added in the subdirectories.
> 

The above paragraph doesn't add clarity and may as well be dropped.
On the other side, the commit message still doesn't mention that
pr_debug depends on DEBUG, which I am sure many people don't know
or remember. This is the prime reason why this patch is acceptable,
so it most definitely needs to be mentioned here.

Guenter

> Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Signed-off-by: Junhao He <hejunhao2@...ilicon.com>
> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
> ---
>  drivers/hwmon/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 09a86c5..1c0c089 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -201,5 +201,5 @@ obj-$(CONFIG_SENSORS_XGENE)	+= xgene-hwmon.o
>  obj-$(CONFIG_SENSORS_OCC)	+= occ/
>  obj-$(CONFIG_PMBUS)		+= pmbus/
>  
> -ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
> +subdir-ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
>  
> -- 
> 2.8.1
>