From: Nathan Chancellor natechancellor@gmail.com
[ Upstream commit 3db5e0ba8b8f4aee631d7ee04b7a11c56cfdc213 ]
When building the kernel with Clang, some disabled warnings appear because this Makefile overrides KBUILD_CFLAGS for x86{,_64}. Add them to this list so that the build is clean again.
-Wpointer-sign was disabled for the whole kernel before the beginning of Git history.
-Waddress-of-packed-member was disabled for the whole kernel and for the early boot code in these commits:
bfb38988c51e ("kbuild: clang: Disable 'address-of-packed-member' warning") 20c6c1890455 ("x86/boot: Disable the address-of-packed-member compiler warning").
-Wgnu was disabled for the whole kernel and for the early boot code in these commits:
61163efae020 ("kbuild: LLVMLinux: Add Kbuild support for building kernel with Clang") 6c3b56b19730 ("x86/boot: Disable Clang warnings about GNU extensions").
[ mingo: Made the changelog more readable. ]
Tested-by: Sedat Dilek sedat.dilek@gmail.com Signed-off-by: Nathan Chancellor natechancellor@gmail.com Signed-off-by: Ard Biesheuvel ard.biesheuvel@linaro.org Reviewed-by: Sedat Dilek sedat.dilek@gmail.com Cc: Andy Lutomirski luto@kernel.org Cc: Arend van Spriel arend.vanspriel@broadcom.com Cc: Bhupesh Sharma bhsharma@redhat.com Cc: Borislav Petkov bp@alien8.de Cc: Dave Hansen dave.hansen@intel.com Cc: Eric Snowberg eric.snowberg@oracle.com Cc: Hans de Goede hdegoede@redhat.com Cc: Joe Perches joe@perches.com Cc: Jon Hunter jonathanh@nvidia.com Cc: Julien Thierry julien.thierry@arm.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Marc Zyngier marc.zyngier@arm.com Cc: Matt Fleming matt@codeblueprint.co.uk Cc: Peter Zijlstra peterz@infradead.org Cc: Sai Praneeth Prakhya sai.praneeth.prakhya@intel.com Cc: Thomas Gleixner tglx@linutronix.de Cc: YiFei Zhu zhuyifei1999@gmail.com Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20181129171230.18699-8-ard.biesheuvel@linaro.org Link: https://github.com/ClangBuiltLinux/linux/issues/112 Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/efi/libstub/Makefile | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index c51627660dbb..d9845099635e 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -9,7 +9,10 @@ cflags-$(CONFIG_X86_32) := -march=i386 cflags-$(CONFIG_X86_64) := -mcmodel=small cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \ -fPIC -fno-strict-aliasing -mno-red-zone \ - -mno-mmx -mno-sse -fshort-wchar + -mno-mmx -mno-sse -fshort-wchar \ + -Wno-pointer-sign \ + $(call cc-disable-warning, address-of-packed-member) \ + $(call cc-disable-warning, gnu)
# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly # disable the stackleak plugin