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    Subject[PATCH v2] x86, kconfig: Pick up the .config arch version in 'make oldconfig'
    I wasted a bunch of time today because I'd taken a .config from my 
    test machine and tried to build it, and the existing setting of
    CONFIG_X86_32 got changed to the host system's bitness which was

    This patch fixes that. Last time I tried to fix this bug, I had
    introduced a regression that broke:

    make ARCH=x86_64 randconfig
    make ARCH=i386 randconfig

    type of filtered-randconfig behavior which restricted randconfigs to
    64-bit and 32-bit configs, respectively.

    This version fixes that so prior randconfig behavior is maintained,
    although if a "filtered randconfig" is desired it seems like it would be
    better to actually implement that properly, rather than relying on a
    hack which preserves the obsolete 'ARCH=i386' and 'ARCH=x86_64' legacy
    just to influence *one* of the many config options that might need to be
    hard-coded if you actually want a 'randconfig' that produces a useful

    Signed-off-by: David Woodhouse <>

    v2: Explicitly turn off CONFIG_64BIT in i386_defconfig. The default for
    CONFIG_64BIT has *changed* (from n to y) for ARCH=x86, so it needs to be
    explicitly turned off or 'make i386_defconfig' will give you 64-bit :)

    diff --git a/Makefile b/Makefile
    index 123d858..7b3b7c5 100644
    --- a/Makefile
    +++ b/Makefile
    @@ -165,7 +165,8 @@ export srctree objtree VPATH
    # then ARCH is assigned, getting whatever value it gets normally, and
    # SUBARCH is subsequently ignored.

    -SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
    +SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
    + -e s/sun4u/sparc64/ \
    -e s/arm.*/arm/ -e s/sa110/arm/ \
    -e s/s390x/s390/ -e s/parisc64/parisc/ \
    -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index cc6c53a..1f206b0 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -1,7 +1,7 @@
    # Select 32 or 64 bit
    config 64BIT
    bool "64-bit kernel" if ARCH = "x86"
    - default ARCH = "x86_64"
    + default ARCH != "i386"
    Say yes to build a 64-bit kernel - formerly known as x86_64
    Say no to build a 32-bit kernel - formerly known as i386
    diff --git a/arch/x86/Makefile b/arch/x86/Makefile
    index b02e509..94c2d8c 100644
    --- a/arch/x86/Makefile
    +++ b/arch/x86/Makefile
    @@ -2,7 +2,11 @@

    # select defconfig based on actual architecture
    ifeq ($(ARCH),x86)
    + ifeq ($(shell uname -m),x86_64)
    + KBUILD_DEFCONFIG := x86_64_defconfig
    + else
    KBUILD_DEFCONFIG := i386_defconfig
    + endif
    KBUILD_DEFCONFIG := $(ARCH)_defconfig
    diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
    index 6f98726..41cab70 100644
    --- a/arch/x86/configs/i386_defconfig
    +++ b/arch/x86/configs/i386_defconfig
    @@ -1,3 +1,4 @@
    +# CONFIG_64BIT is not set

     \ /
      Last update: 2011-05-30 12:11    [W:0.027 / U:17.304 seconds]
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