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Date: Mon, 25 Feb 2019 22:11:46 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>, Doug Anderson <dianders@...omium.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Nathan Chancellor <natechancellor@...il.com> Subject: [PATCH 4.9 46/63] x86/boot: Disable the address-of-packed-member compiler warning 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Matthias Kaehlcke <mka@...omium.org> commit 20c6c189045539d29f4854d92b7ea9c329e1edfc upstream. 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@...omium.org> Cc: Doug Anderson <dianders@...omium.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Link: http://lkml.kernel.org/r/20170725215053.135586-1-mka@chromium.org Signed-off-by: Ingo Molnar <mingo@...nel.org> Signed-off-by: Nathan Chancellor <natechancellor@...il.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/x86/boot/compressed/Makefile | 1 + 1 file changed, 1 insertion(+) --- 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
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