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SubjectRe: [PATCH 1/4] driver core: Use subdir-ccflags-* to inherit debug flag
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 <>
>> 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.

as there is no other debug config in the subdirectory of driver/base,
CONFIG_DEBUG_DRIVER may also mean turn on the debug in the subdirectories, so use
subdir-ccflags-* instead for the -DDEBUG will allow us to enable debug for all
the subdirectories.


> thanks,
> greg k-h
> .

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