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    SubjectRe: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

    * 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.

    > [...] 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?

    Thanks,

    Ingo


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