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    SubjectRe: [PATCH 2/5] bitops: compile time optimization for hweight_long(CONSTANT)
    On 17.2.2010 18:31, Michal Marek wrote:
    > On 17.2.2010 18:20, Borislav Petkov wrote:
    >> On Wed, Feb 17, 2010 at 02:57:42PM +0100, Michal Marek wrote:
    >>> On 12.2.2010 20:05, H. Peter Anvin wrote:
    >>>> On 02/12/2010 09:47 AM, Borislav Petkov wrote:
    >>>>> However, this is generic code and for the above to work we have to
    >>>>> enforce x86-specific CFLAGS for it. What is the preferred way to do
    >>>>> that?
    >>>> That's a question for Michal and the kbuild list. Michal?
    >>> (I was offline last week).
    >>> The _preferred_ way probably is not to do it :), but otherwise you can
    >>> set CFLAGS_hweight.o depending on CONFIG_X86(_32|_64), just like you do
    >>> in arch/x86/lib/Makefile already.
    >> Wouldn't it be better if we had something like ARCH_CFLAGS_hweight.o
    >> which gets set in the arch Makefile instead?
    > We could, but is it worth it if there is only one potential user so far?
    > IMO just put the condition to lib/Makefile now and if there turn out to
    > be more cases like this, we can add support for ARCH_CFLAGS_foo.o then.

    It wouldn't work actually, because such variable would then apply to all
    hweight.o targets in the tree. But another way would be:

    default "..." if X86_32
    default "..." if X86_64



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