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

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Date:   Wed, 24 Feb 2021 17:56:20 +0800
From:   Yicong Yang <yangyicong@...ilicon.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
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 2021/2/10 19:42, Daniel Thompson wrote:
> 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).
> 

yes. they're two mechanisms of debug. i think it's the right thing to make
both work properly.

> 
> Daniel.
> 
> .
>