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    SubjectRe: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible

    * Andi Kleen <andi@firstfloor.org> wrote:

    > > Could you please try the patch below?
    >
    > This is very likely not a good idea. I heard some systems can hang
    > if you overwrite their PMUs this way and you're unlucky enough :-(

    Wrong - in that case all kernels from 2.6.32 to 2.6.38 would already be locking
    up. This patch simply restores behavior to essentially what it was before
    v2.6.38 - but also adds the warning.

    Thanks,

    Ingo


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