Commit 1344794a authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Masahiro Yamada
Browse files

Kbuild: add -Wno-shift-negative-value where -Wextra is used 



As a preparation for moving to -std=gnu11, turn off the
-Wshift-negative-value option. This warning is enabled by gcc when
building with -Wextra for c99 or higher, but not for c89. Since
the kernel already relies on well-defined overflow behavior,
the warning is not helpful and can simply be disabled in
all locations that use -Wextra.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM/Clang v13.0.0 (x86-64)
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent 754e0b0e

drivers/gpu/drm/i915/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ subdir-ccflags-y += -Wno-unused-parameter 
subdir-ccflags-y += -Wno-type-limits

subdir-ccflags-y += -Wno-missing-field-initializers

subdir-ccflags-y += -Wno-sign-compare

subdir-ccflags-y += -Wno-shift-negative-value

subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable)

subdir-ccflags-y += $(call cc-disable-warning, frame-address)

subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror

drivers/staging/greybus/tools/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -12,7 +12,8 @@ CFLAGS += -std=gnu99 -Wall -Wextra -g \ 
	    -Wredundant-decls \

	    -Wcast-align \

	    -Wsign-compare \

	    -Wno-missing-field-initializers

	    -Wno-missing-field-initializers \

	    -Wno-shift-negative-value



CC	:= $(CROSS_COMPILE)gcc

fs/btrfs/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ subdir-ccflags-y += $(condflags) 
subdir-ccflags-y += -Wno-missing-field-initializers

subdir-ccflags-y += -Wno-sign-compare

subdir-ccflags-y += -Wno-type-limits

subdir-ccflags-y += -Wno-shift-negative-value



obj-$(CONFIG_BTRFS_FS) := btrfs.o

scripts/Makefile.extrawarn

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation) 
KBUILD_CFLAGS += -Wno-missing-field-initializers

KBUILD_CFLAGS += -Wno-sign-compare

KBUILD_CFLAGS += -Wno-type-limits

KBUILD_CFLAGS += -Wno-shift-negative-value



KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1