linux-kernel - Re: [tip:x86/build] x86/build: Don't pass in -D__KERNEL_

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Date:   Sat, 31 Mar 2018 10:38:16 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     yamada.masahiro@...ionext.com, tglx@...utronix.de,
        michal.lkml@...kovi.net, linux-kernel@...r.kernel.org,
        hpa@...or.com, torvalds@...ux-foundation.org, peterz@...radead.org,
        caoj.fnst@...fujitsu.com
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/build] x86/build: Don't pass in -D__KERNEL__ multiple
 times


* tip-bot for Cao jin <tipbot@...or.com> wrote:

> Commit-ID:  d6289f36aa7d5893d091a7a0c67eee7798719f03
> Gitweb:     https://git.kernel.org/tip/d6289f36aa7d5893d091a7a0c67eee7798719f03
> Author:     Cao jin <caoj.fnst@...fujitsu.com>
> AuthorDate: Fri, 16 Mar 2018 16:49:44 +0800
> Committer:  Ingo Molnar <mingo@...nel.org>
> CommitDate: Sat, 31 Mar 2018 08:02:07 +0200
> 
> x86/build: Don't pass in -D__KERNEL__ multiple times
> 
> Some .<target>.cmd files under arch/x86 are showing two instances of
> -D__KERNEL__, like arch/x86/boot/ and arch/x86/realmode/rm/.
> 
> __KERNEL__ is already defined in KBUILD_CPPFLAGS in the top Makefile,
> so it can be dropped safely.
> 
> Signed-off-by: Cao jin <caoj.fnst@...fujitsu.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Cc: Michal Marek <michal.lkml@...kovi.net>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: linux-kbuild@...r.kernel.org
> Link: http://lkml.kernel.org/r/20180316084944.3997-1-caoj.fnst@cn.fujitsu.com
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> ---
>  arch/x86/Makefile                 | 3 +--
>  arch/x86/boot/compressed/Makefile | 2 +-
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index d798e36d103c..a517852dad55 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -31,8 +31,7 @@ endif
>  CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
>  M16_CFLAGS	 := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
>  
> -REALMODE_CFLAGS	:= $(M16_CFLAGS) -g -Os -D__KERNEL__ \
> -		   -DDISABLE_BRANCH_PROFILING \
> +REALMODE_CFLAGS	:= $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \
>  		   -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
>  		   -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
>  		   -mno-mmx -mno-sse
> diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
> index f25e1530e064..f484ae0ece93 100644
> --- a/arch/x86/boot/compressed/Makefile
> +++ b/arch/x86/boot/compressed/Makefile
> @@ -26,7 +26,7 @@ KCOV_INSTRUMENT		:= n
>  targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
>  	vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4
>  
> -KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ -O2
> +KBUILD_CFLAGS := -m$(BITS) -O2
>  KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC)
>  KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
>  cflags-$(CONFIG_X86_32) := -march=i386

Dropped this patch, it's totally untested, the build fails on x86-64 defconfig 
already.

Thanks,

	Ingo