[PATCH v2 1/4] driver core: Use subdir-ccflags-* to inherit debug flag

[Yicong Yang]

From: Junhao He <hejunhao2@xxxxxxxxxxxxx>

Currently we can turn on the debug message in the top directory
driver/base and subdirectory driver/base/power with kconfig
option CONFIG_DEBUG_DRIVER. But the DEBUG flags will not
pass to subdirectory drvier/base/firmware_loader which
the ccflags-$(CONFIG_DEBUG_DRIVER) is missing and there is
no kconfig option to turn on the debug message for it.

Use subdir-ccflags-* for the DEBUG flag in the top directory
will fix this. Considering CONFIG_DEBUG_DRIVER intends
to turn on the debug recursively, use subdir-cclags-* will
be clearer and avoid omittance of DEBUG define
in the subdirectory.

Suggested-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Junhao He <hejunhao2@xxxxxxxxxxxxx>
Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
---
 drivers/base/Makefile       | 2 +-
 drivers/base/power/Makefile | 2 --
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 5e7bf96..c6bdf19 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -27,5 +27,5 @@ obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += arch_topology.o
 
 obj-y			+= test/
 
-ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
+subdir-ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
 
diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile
index 8fdd007..2990167 100644
--- a/drivers/base/power/Makefile
+++ b/drivers/base/power/Makefile
@@ -5,5 +5,3 @@ obj-$(CONFIG_PM_TRACE_RTC)	+= trace.o
 obj-$(CONFIG_PM_GENERIC_DOMAINS)	+=  domain.o domain_governor.o
 obj-$(CONFIG_HAVE_CLK)	+= clock_ops.o
 obj-$(CONFIG_PM_QOS_KUNIT_TEST) += qos-test.o
-
-ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
-- 
2.8.1