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    SubjectRe: [GIT PULL] SLAB changes for v2.6.39-rc1

    * Pekka Enberg <penberg@kernel.org> wrote:

    > On Thu, Mar 24, 2011 at 4:41 PM, Christoph Lameter <cl@linux.com> wrote:
    > > On Thu, 24 Mar 2011, Ingo Molnar wrote:
    > >
    > >> FYI, some sort of boot crash has snuck upstream in the last 24 hours:
    > >>
    > >>  BUG: unable to handle kernel paging request at ffff87ffc147e020
    > >>  IP: [<ffffffff811aa762>] this_cpu_cmpxchg16b_emu+0x2/0x1c
    > >
    > > Hmmm.. This is the fallback code for the case that the processor does not
    > > support cmpxchg16b.
    >
    > How does alternative_io() work? Does it require
    > alternative_instructions() to be executed. If so, the fallback code
    > won't be active when we enter kmem_cache_init(). Is there any reason
    > check_bugs() is called so late during boot? Can we do something like
    > the totally untested attached patch?

    Does the config i sent you boot on your box? I think the bug is pretty generic
    and should trigger on any box.

    Thanks,

    Ingo
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