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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6 
 kernel/scripts/Makefile.extrawarn
....@@ -1,78 +1,97 @@
11 # SPDX-License-Identifier: GPL-2.0
22 # ==========================================================================
3
-#
43 # make W=... settings
54 #
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-# W=1 - warnings that may be relevant and does not occur too often
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-# W=2 - warnings that occur quite often but may still be relevant
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-# W=3 - the more obscure warnings, can most likely be ignored
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-#
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-# $(call cc-option, -W...) handles gcc -W.. options which
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-# are not supported by all versions of the compiler
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+# There are three warning groups enabled by W=1, W=2, W=3.
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+# They are independent, and can be combined like W=12 or W=123.
127 # ==========================================================================
138 
149 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
1510 
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+# backward compatibility
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+KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
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+
1614 ifeq ("$(origin W)", "command line")
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-  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
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+  KBUILD_EXTRA_WARN := $(W)
1816 endif
1917 
20
-ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
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-warning-  := $(empty)
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+export KBUILD_EXTRA_WARN
2219 
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-warning-1 := -Wextra -Wunused -Wno-unused-parameter
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-warning-1 += -Wmissing-declarations
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-warning-1 += -Wmissing-format-attribute
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-warning-1 += $(call cc-option, -Wmissing-prototypes)
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-warning-1 += -Wold-style-definition
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-warning-1 += $(call cc-option, -Wmissing-include-dirs)
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-warning-1 += $(call cc-option, -Wunused-but-set-variable)
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-warning-1 += $(call cc-option, -Wunused-const-variable)
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-warning-1 += $(call cc-option, -Wpacked-not-aligned)
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-warning-1 += $(call cc-disable-warning, missing-field-initializers)
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-warning-1 += $(call cc-disable-warning, sign-compare)
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+#
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+# W=1 - warnings which may be relevant and do not occur too often
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+#
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+ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
3424 
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-warning-2 := -Waggregate-return
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-warning-2 += -Wcast-align
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-warning-2 += -Wdisabled-optimization
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-warning-2 += -Wnested-externs
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-warning-2 += -Wshadow
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-warning-2 += $(call cc-option, -Wlogical-op)
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-warning-2 += $(call cc-option, -Wmissing-field-initializers)
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-warning-2 += $(call cc-option, -Wsign-compare)
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-warning-2 += $(call cc-option, -Wmaybe-uninitialized)
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-warning-2 += $(call cc-option, -Wunused-macros)
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+KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter
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+KBUILD_CFLAGS += -Wmissing-declarations
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+KBUILD_CFLAGS += -Wmissing-format-attribute
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+KBUILD_CFLAGS += -Wmissing-prototypes
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+KBUILD_CFLAGS += -Wold-style-definition
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+KBUILD_CFLAGS += -Wmissing-include-dirs
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+KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)
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+KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
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+KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
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+KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
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+# The following turn off the warnings enabled by -Wextra
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+KBUILD_CFLAGS += -Wno-missing-field-initializers
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+KBUILD_CFLAGS += -Wno-sign-compare
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+KBUILD_CFLAGS += -Wno-type-limits
4539 
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-warning-3 := -Wbad-function-cast
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-warning-3 += -Wcast-qual
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-warning-3 += -Wconversion
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-warning-3 += -Wpacked
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-warning-3 += -Wpadded
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-warning-3 += -Wpointer-arith
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-warning-3 += -Wredundant-decls
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-warning-3 += -Wswitch-default
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-warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
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-warning-3 += $(call cc-option, -Wvla)
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+KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
5641 
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-warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
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-warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
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-warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
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-
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-ifeq ("$(strip $(warning))","")
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-        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
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-endif
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-
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-KBUILD_CFLAGS += $(warning)
6642 else
6743 
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-ifeq ($(cc-name),clang)
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-KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
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-KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
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-KBUILD_CFLAGS += $(call cc-disable-warning, format)
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-KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
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-KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
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-KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
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+# Some diagnostics enabled by default are noisy.
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+# Suppress them by using -Wno... except for W=1.
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+
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+ifdef CONFIG_CC_IS_CLANG
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+KBUILD_CFLAGS += -Wno-initializer-overrides
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+KBUILD_CFLAGS += -Wno-format
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+KBUILD_CFLAGS += -Wno-sign-compare
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+KBUILD_CFLAGS += -Wno-format-zero-length
7552 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
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+KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
7654 KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
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+KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict)
7756 endif
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+
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+endif
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+
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+#
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+# W=2 - warnings which occur quite often but may still be relevant
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+#
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+ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
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+
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+KBUILD_CFLAGS += -Wdisabled-optimization
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+KBUILD_CFLAGS += -Wnested-externs
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+KBUILD_CFLAGS += -Wshadow
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+KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
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+KBUILD_CFLAGS += -Wmissing-field-initializers
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+KBUILD_CFLAGS += -Wtype-limits
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+KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
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+KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
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+
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+KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
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+
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+endif
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+
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+#
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+# W=3 - more obscure warnings, can most likely be ignored
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+#
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+ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
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+
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+KBUILD_CFLAGS += -Wbad-function-cast
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+KBUILD_CFLAGS += -Wcast-align
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+KBUILD_CFLAGS += -Wcast-qual
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+KBUILD_CFLAGS += -Wconversion
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+KBUILD_CFLAGS += -Wpacked
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+KBUILD_CFLAGS += -Wpadded
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+KBUILD_CFLAGS += -Wpointer-arith
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+KBUILD_CFLAGS += -Wredundant-decls
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+KBUILD_CFLAGS += -Wsign-compare
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+KBUILD_CFLAGS += -Wswitch-default
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+KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat)
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+
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+KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
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+
7897 endif