[PATCH v2 4/4] x86/boot/compressed: Enable -Wunused

[Thorsten Blum]

arch/x86/boot/compressed/Makefile resets the CFLAGS for this directory,
but does not re-enable -Wunused. Therefore, unused variables and static
functions in arch/x86/boot/compressed/ currently do not emit warnings.

Add -Wunused to warn about these, and -Wno-unused-but-set-variable as
well as -Wno-unused-const-variable to match the W=0 kernel defaults.

Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxx>
---
 arch/x86/boot/compressed/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 07e0e64b9a98..c1315a7b712c 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -28,6 +28,9 @@ KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
 KBUILD_CFLAGS += $(CC_FLAGS_DIALECT)
 KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
 KBUILD_CFLAGS += -Wundef
+KBUILD_CFLAGS += -Wunused
+KBUILD_CFLAGS += -Wno-unused-but-set-variable
+KBUILD_CFLAGS += -Wno-unused-const-variable
 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 cflags-$(CONFIG_X86_32) := -march=i386
 cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone