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

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Date:   Wed, 10 Feb 2021 17:42:01 +0800
From:   Yicong Yang <yangyicong@...ilicon.com>
To:     Guenter Roeck <linux@...ck-us.net>
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 2021/2/9 23:06, Guenter Roeck wrote:
> 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.

sorry, i didn't realize that you mean this. will impove this in the next
version after the lunar new year holiday over.

Thanks,
Yicong

> 
> 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
>>
> 
> .
>