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Date:   Thu,  1 Oct 2020 03:12:31 +0200
From:   Andrew Lunn <>
To:     netdev <>
Cc:     David Miller <>,
        Jakub Kicinski <>,
        Masahiro Yamada <>,
        Michal Marek <>,
        Rohit Maheshwari <>,,,
        Andrew Lunn <>
Subject: [PATCH net-next v2 1/2] Makefile.extrawarn: Add symbol for W=1 warnings for today

There is a movement to try to make more and more of /drivers W=1
clean. But it will only stay clean if new warnings are quickly
detected and fixed, ideally by the developer adding the new code.

To allow subdirectories to sign up to being W=1 clean for a given
definition of W=1, export the current set of additional compile flags
using the symbol KBUILD_CFLAGS_W1_20200930. Subdirectory Makefiles can
then use:

subdir-ccflags-y := $(KBUILD_CFLAGS_W1_20200930)

To indicate they want to W=1 warnings as defined on 20200930.

Additional warnings can be added to the W=1 definition. This will not
affect KBUILD_CFLAGS_W1_20200930 and hence no additional warnings will
start appearing unless W=1 is actually added to the command
line. Developers can then take their time to fix any new W=1 warnings,
and then update to the latest KBUILD_CFLAGS_W1_<DATESTAMP> symbol.

Signed-off-by: Andrew Lunn <>
 scripts/Makefile.extrawarn | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 95e4cdb94fe9..957dca35ae3e 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -20,24 +20,26 @@ export KBUILD_EXTRA_WARN
 # W=1 - warnings which may be relevant and do not occur too often
-ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
-KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter
-KBUILD_CFLAGS += -Wmissing-declarations
-KBUILD_CFLAGS += -Wmissing-format-attribute
-KBUILD_CFLAGS += -Wmissing-prototypes
-KBUILD_CFLAGS += -Wold-style-definition
-KBUILD_CFLAGS += -Wmissing-include-dirs
-KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)
-KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
-KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
-KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
+KBUILD_CFLAGS_W1_20200930 += -Wextra -Wunused -Wno-unused-parameter
+KBUILD_CFLAGS_W1_20200930 += -Wmissing-declarations
+KBUILD_CFLAGS_W1_20200930 += -Wmissing-format-attribute
+KBUILD_CFLAGS_W1_20200930 += -Wmissing-prototypes
+KBUILD_CFLAGS_W1_20200930 += -Wold-style-definition
+KBUILD_CFLAGS_W1_20200930 += -Wmissing-include-dirs
+KBUILD_CFLAGS_W1_20200930 += $(call cc-option, -Wunused-but-set-variable)
+KBUILD_CFLAGS_W1_20200930 += $(call cc-option, -Wunused-const-variable)
+KBUILD_CFLAGS_W1_20200930 += $(call cc-option, -Wpacked-not-aligned)
+KBUILD_CFLAGS_W1_20200930 += $(call cc-option, -Wstringop-truncation)
 # The following turn off the warnings enabled by -Wextra
-KBUILD_CFLAGS += -Wno-missing-field-initializers
-KBUILD_CFLAGS += -Wno-sign-compare
-KBUILD_CFLAGS += -Wno-type-limits
+KBUILD_CFLAGS_W1_20200930 += -Wno-missing-field-initializers
+KBUILD_CFLAGS_W1_20200930 += -Wno-sign-compare
+KBUILD_CFLAGS_W1_20200930 += -Wno-type-limits
+export KBUILD_CFLAGS_W1_20200930
+ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)

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