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    SubjectRe: [PATCH 1/2 v2] x86: add max_addr boot option
    On 06/12/2012 07:21 PM, Kamezawa Hiroyuki wrote:
    > But now, we know mem= boot option is acts as max_addr=
    > option, we have concerns that 'someone may fix mem= option as sane as ia64. because
    > it's buggy".
    > We'd like to fix mem= boot option by ourselves and preserve old behavior
    > with max_addr= boot option, which ia64 has.

    Now I'm *really* confused.

    Realistically, there is no point in the old mem= behavior of assuming a
    contiguous chunk of memory up to that point; it simply doesn't match how
    modern hardware is constructed. Your notion that ia64 is "sane" is
    probably more of "outdated" in my opinion.

    As such, the current behavior for mem= seems like the right thing and
    the change was intentional (not to mention has been in place since
    kernel 2.5.65, back in 2003); it also solves your requirements. If you
    are concerned about it, it would make more sense to make sure it is
    documented as intentional.

    In fact, it looks like IA64 introduced a divergence when the max_addr=
    patch was introduced in 2004. You're basically proposing the same
    divergence for x86 now; talk about having the tail wag the dog.

    Sorry. NAK.


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