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

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Date:   Tue, 9 Feb 2021 19:08:16 +0800
From:   Yicong Yang <yangyicong@...ilicon.com>
To:     <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>
CC:     <prime.zeng@...wei.com>, <yangyicong@...ilicon.com>,
        <linuxarm@...neuler.org>
Subject: [PATCH v2 1/4] driver core: Use subdir-ccflags-* to inherit debug flag

From: Junhao He <hejunhao2@...ilicon.com>

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@...gle.com>
Signed-off-by: Junhao He <hejunhao2@...ilicon.com>
Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
---
 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