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    SubjectRe: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs
    On Wed, 4 May 2011, Ingo Molnar wrote:

    >
    > * Linus Torvalds <torvalds@linux-foundation.org> wrote:
    >
    > > My gut reaction would be: let's do the minimal patch that just fixes things
    > > to do irqsafe_cpu_cmpxchg_double() for 2.6.39, and then let's remove the
    > > #ifdef'fery in -rc1. [...]
    >
    > Looks like the sanest option IMHO, -rc7 is pretty late for anything than a
    > few-liner patch.

    Agreed.

    > > [...] Or make _really_ sure that things are ok for platforms that never even
    > > triggered the CMPXCHG_LOCAL case before.
    >
    > Considering that the status quo was !CMPXCHG_LOCAL in v2.6.38 and that lockless
    > SLUB is an x86-only affair right now:
    >
    > $ git grep CMPXCHG_LOCAL arch/
    > arch/um/Kconfig.x86:config CMPXCHG_LOCAL
    > arch/x86/Kconfig.cpu:config CMPXCHG_LOCAL
    >
    > There should be no problem with other architectures, right?

    No, they use the local_irq disabled path which is pretty much the same
    as in 38.

    Thanks,

    tglx


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