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    SubjectRe: [S+Q2 07/19] slub: Allow removal of slab caches during boot
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    On Wed, 2010-07-14 at 16:48 -0700, David Rientjes wrote:
    > On Fri, 9 Jul 2010, Christoph Lameter wrote:
    >
    > > If a slab cache is removed before we have setup sysfs then simply skip over
    > > the sysfs handling.
    > >
    > > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    > > Cc: Roland Dreier <rdreier@cisco.com>
    > > Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
    >
    > Acked-by: David Rientjes <rientjes@google.com>
    >
    > I missed this case earlier because I didn't consider slab caches being
    > created and destroyed prior to slab_state == SYSFS, sorry!

    Ok so I may be a bit sleepy or something but I still fail to see how
    this whole thing isn't totally racy...

    AFAIK. By the time we switch the slab state, we -do- have all CPUs up
    and can race happily between creating slab caches and creating the sysfs
    files...

    Ben.




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