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authorMatthias Kaehlcke <mka@chromium.org>2017-07-25 14:50:53 -0700
committerIngo Molnar <mingo@kernel.org>2017-07-28 08:39:08 +0200
commit20c6c189045539d29f4854d92b7ea9c329e1edfc (patch)
treed18ca4fe4d06006495b047f1d763bc4fe943bdf0
parent4ecf7191fdcc5686c1eb2b06d7f93ce29d636cf0 (diff)
x86/boot: Disable the address-of-packed-member compiler warning
The clang warning 'address-of-packed-member' is disabled for the general kernel code, also disable it for the x86 boot code. This suppresses a bunch of warnings like this when building with clang: ./arch/x86/include/asm/processor.h:535:30: warning: taking address of packed member 'sp0' of class or structure 'x86_hw_tss' may result in an unaligned pointer value [-Waddress-of-packed-member] return this_cpu_read_stable(cpu_tss.x86_tss.sp0); ^~~~~~~~~~~~~~~~~~~ ./arch/x86/include/asm/percpu.h:391:59: note: expanded from macro 'this_cpu_read_stable' #define this_cpu_read_stable(var) percpu_stable_op("mov", var) ^~~ ./arch/x86/include/asm/percpu.h:228:16: note: expanded from macro 'percpu_stable_op' : "p" (&(var))); ^~~ Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Cc: Doug Anderson <dianders@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170725215053.135586-1-mka@chromium.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/boot/compressed/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 2c860ad4fe06..8a958274b54c 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -34,6 +34,7 @@ KBUILD_CFLAGS += $(cflags-y)
KBUILD_CFLAGS += -mno-mmx -mno-sse
KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
+KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
GCOV_PROFILE := n