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

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Date:   Sat, 31 Mar 2018 10:44:47 +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


* Ingo Molnar <mingo@...nel.org> wrote:

> 
> * 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.

Apologies, I messed up my testing: the patch is fine after all!

Thanks,

	Ingo