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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Sat, 2 Jun 2018 16:53:48 +0900
Message-ID: <CAK7LNASGYhAGbHbVzb+bbnpOsh2Vvt-C0cYpzu55b0PS-Oqc4Q@mail.gmail.com>
Subject: Re: [PATCH] kbuild: add machine size to CHEKCFLAGS
To:     Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Cc:     Michal Marek <michal.lkml@markovi.net>,
        Richard Henderson <rth@twiddle.net>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Matt Turner <mattst88@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Tony Luck <tony.luck@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>,
        Ralf Baechle <ralf@linux-mips.org>,
        James Hogan <jhogan@kernel.org>,
        "James E . J . Bottomley" <jejb@parisc-linux.org>,
        Helge Deller <deller@gmx.de>,
        "David S . Miller" <davem@davemloft.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H . Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
        Brendan Higgins <brendanhiggins@google.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Cao jin <caoj.fnst@cn.fujitsu.com>,
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2018-05-31 5:48 GMT+09:00 Luc Van Oostenryck <luc.vanoostenryck@gmail.com>:
> By default, sparse assumes a 64bit machine when compiled on x86-64
> and 32bit when compiled on anything else.
>
> This can of course create all sort of problems for the other archs, like
> issuing false warnings ('shift too big (32) for type unsigned long'), or
> worse, failing to emit legitimate warnings.
>
> Fix this by adding the -m32/-m64 flag, depending on CONFIG_64BIT,
> to CHECKFLAGS in the main Makefile (and so for all archs).
> Also, remove the now unneeded -m32/-m64 in arch specific Makefiles.
>
> Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
> ---

Fixed CHEKCFLAGS -> CHECKFLAGS
and applied to linux-kbuild.  Thanks!


>  Makefile             | 3 +++
>  arch/alpha/Makefile  | 2 +-
>  arch/arm/Makefile    | 2 +-
>  arch/arm64/Makefile  | 2 +-
>  arch/ia64/Makefile   | 2 +-
>  arch/mips/Makefile   | 3 ---
>  arch/parisc/Makefile | 2 +-
>  arch/sparc/Makefile  | 2 +-
>  arch/x86/Makefile    | 2 +-
>  9 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 6c6610913..18379987c 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -881,6 +881,9 @@ endif
>  # insure the checker run with the right endianness
>  CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
>
> +# the checker needs the correct machine size
> +CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
> +
>  # Default kernel image to build when no specific target is given.
>  # KBUILD_IMAGE may be overruled on the command line or
>  # set in the environment
> diff --git a/arch/alpha/Makefile b/arch/alpha/Makefile
> index 2cc3cc519..c5ec8c09c 100644
> --- a/arch/alpha/Makefile
> +++ b/arch/alpha/Makefile
> @@ -11,7 +11,7 @@
>  NM := $(NM) -B
>
>  LDFLAGS_vmlinux        := -static -N #-relax
> -CHECKFLAGS     += -D__alpha__ -m64
> +CHECKFLAGS     += -D__alpha__
>  cflags-y       := -pipe -mno-fp-regs -ffixed-8
>  cflags-y       += $(call cc-option, -fno-jump-tables)
>
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index e4e537f27..f32a5468d 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -135,7 +135,7 @@ endif
>  KBUILD_CFLAGS  +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
>  KBUILD_AFLAGS  +=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float
>
> -CHECKFLAGS     += -D__arm__ -m32
> +CHECKFLAGS     += -D__arm__
>
>  #Default value
>  head-y         := arch/arm/kernel/head$(MMUEXT).o
> diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
> index 87f7d2f9f..3c353b471 100644
> --- a/arch/arm64/Makefile
> +++ b/arch/arm64/Makefile
> @@ -78,7 +78,7 @@ LDFLAGS               += -maarch64linux
>  UTS_MACHINE    := aarch64
>  endif
>
> -CHECKFLAGS     += -D__aarch64__ -m64
> +CHECKFLAGS     += -D__aarch64__
>
>  ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
>  KBUILD_LDFLAGS_MODULE  += -T $(srctree)/arch/arm64/kernel/module.lds
> diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
> index 2dd7f519a..45f59808b 100644
> --- a/arch/ia64/Makefile
> +++ b/arch/ia64/Makefile
> @@ -18,7 +18,7 @@ READELF := $(CROSS_COMPILE)readelf
>
>  export AWK
>
> -CHECKFLAGS     += -m64 -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__
> +CHECKFLAGS     += -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__
>
>  OBJCOPYFLAGS   := --strip-all
>  LDFLAGS_vmlinux        := -static
> diff --git a/arch/mips/Makefile b/arch/mips/Makefile
> index 5e9fce076..e2122cca4 100644
> --- a/arch/mips/Makefile
> +++ b/arch/mips/Makefile
> @@ -309,9 +309,6 @@ ifdef CONFIG_MIPS
>  CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
>         egrep -vw '__GNUC_(|MINOR_|PATCHLEVEL_)_' | \
>         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
> -ifdef CONFIG_64BIT
> -CHECKFLAGS             += -m64
> -endif
>  endif
>
>  OBJCOPYFLAGS           += --remove-section=.reginfo
> diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
> index 348ae4779..714284ea6 100644
> --- a/arch/parisc/Makefile
> +++ b/arch/parisc/Makefile
> @@ -28,7 +28,7 @@ export LIBGCC
>
>  ifdef CONFIG_64BIT
>  UTS_MACHINE    := parisc64
> -CHECKFLAGS     += -D__LP64__=1 -m64
> +CHECKFLAGS     += -D__LP64__=1
>  CC_ARCHES      = hppa64
>  LD_BFD         := elf64-hppa-linux
>  else # 32-bit
> diff --git a/arch/sparc/Makefile b/arch/sparc/Makefile
> index edac927e4..966a13d2b 100644
> --- a/arch/sparc/Makefile
> +++ b/arch/sparc/Makefile
> @@ -39,7 +39,7 @@ else
>  # sparc64
>  #
>
> -CHECKFLAGS    += -D__sparc__ -D__sparc_v9__ -D__arch64__ -m64
> +CHECKFLAGS    += -D__sparc__ -D__sparc_v9__ -D__arch64__
>  LDFLAGS       := -m elf64_sparc
>  export BITS   := 64
>  UTS_MACHINE   := sparc64
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index 60135cbd9..f0a6ea224 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -94,7 +94,7 @@ ifeq ($(CONFIG_X86_32),y)
>  else
>          BITS := 64
>          UTS_MACHINE := x86_64
> -        CHECKFLAGS += -D__x86_64__ -m64
> +        CHECKFLAGS += -D__x86_64__
>
>          biarch := -m64
>          KBUILD_AFLAGS += -m64
> --
> 2.17.0
>


-- 
Best Regards
Masahiro Yamada