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    SubjectRe: [PATCH] Fix dirty page accounting in redirty_page_for_writepage()

    On Thu, 30 Apr 2009, Ingo Molnar wrote:
    > c0436275: 64 83 05 20 5f 6a c0 addl $0x1,%fs:0xc06a5f20
    > There's no atomic instructions at all - the counters here are only
    > accessed locally. They are local-irq-atomic, but not
    > cacheline-atomic.

    On other architectures, you need the whole "disable preemption,
    load-locked, store-conditional, test-and-loop, enable preemption" thing.

    Or "disable interrupts, load, store, restore interrupts".

    There really aren't very many architectures that can do almost
    unrestricted ALU ops in a single instruction (and thus automatically safe
    from preemption and interrupts).


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