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    SubjectRe: [PATCH 2/4] generic-smp: remove kmalloc usage

    * Rusty Russell <> wrote:

    > On Tuesday 17 February 2009 20:13:59 Ingo Molnar wrote:
    > > We should not bend backwards trying to preserve that kmalloc()
    > > [and prove that it's safe and race-free] - i.e. the burden of
    > > proof is on the person insisting that it's needed, not on the
    > > person wanting to remove it.
    > Respectfully disagree. The kmalloc has been there for a very long time,
    > and doing fine AFAICT.

    The kmalloc(GFP_ATOMIC) has been in kernel/smp.c for about half
    a year, since:

    | commit 3d4422332711ef48ef0f132f1fcbfcbd56c7f3d1
    | Author: Jens Axboe <>
    | Date: Thu Jun 26 11:21:34 2008 +0200
    | Subject: [PATCH] Add generic helpers for arch IPI function calls

    Which introduced kernel/smp.c to begin with. It got merged on
    July 15.

    The precedecessor mechanism, smp_call_function*() on x86, used
    an on-kernel-stack buffer (and a half-wait mechanism), even in
    the async case, not a kmalloc().

    I'm not sure where the "kmalloc has been there for a very long
    time" statement comes from. Are we talking about the same thing?


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