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    SubjectRe: [PATCH 0/5] introduce K64BIT=y and backward compatibility ARCH={i386,x86_64} for x86
    On Sun, Nov 11, 2007 at 06:09:45AM +0100, Adrian Bunk wrote:
    > On Sat, Nov 10, 2007 at 09:40:38PM +0100, Sam Ravnborg wrote:
    > > As discussed in another thread the right thing is to add a generic solution
    > > to select between 32 and 64 bit - useable for powerpc, s390, ppc et al.
    > >...
    > I seriously question this would be "the right thing".
    > 32/64bit isn't that special that this and only this option would require
    > special casing, and the KISS principle of having only one way to specify
    > something like this has it's advantages.

    "The right thing" in the correct context.
    It was discussed to keep ARCH={i386,x86_64} and the point I have
    is that if we are going to extend ARCH=... to be useable to
    specify kernel bit size then it should be done in a generic way
    and not like it was done before on x86.

    I do not consider the discussion about keeping/dropping
    ARCH={i386,x86_64} as concluded.

    And if we decide on keeping ARCH={i386,x86_64} then I have
    questioned the semantics. Clear opinions are missing..

    ARCH= semantic

    Impact before now
    32/64 bit yes yes
    bzImage location yes no
    different Kconfig files yes no
    decide defconfig yes yes
    asm symlink no no
    build option yes no [1]

    [did I miss anything? I think I did]

    [1] ARCH=... select 32/64-bit during configuration.
    There is no difference between ARCH={x86,i386,x86_64}
    when building the kernel because the 32/64 bit
    choice is done at configuration time.

    The table above reflect the [now] semantics with the
    patches that is present at lkml.

    And the patch needed to implment the above
    semantic (after the preparational stuff which
    is generic) are:

    $ git diff --stat HEAD~1..HEAD
    Makefile | 18 ++++++++++++++----
    arch/x86/Makefile | 8 ++++++--
    scripts/kconfig/Makefile | 2 +-
    3 files changed, 21 insertions(+), 7 deletions(-)

    The scripts/kconfig/Makefile change is a bugfix that maybe
    should be included in another patch. It is not x86 specific.

    So 19 additional lines and 5 deleted lines to introduce the
    ARCH= semantics above.


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