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    SubjectRe: Page fault scalability patch V18: Drop first acquisition of ptl

    > However, if this pte_cmpxchg() thing is used for removing access, then
    > sparc64 can't use it. In such a case a race in the TLB handler would
    > result in using an invalid PTE. I could "spin" on some lock bit, but
    > there is no way I'm adding instructions to the carefully constructed
    > TLB miss handler assembler on sparc64 just for that :-)

    Can't you add a lock bit in the PTE itself like we do on ppc64 hash
    refill ?

    Ok, ok, you don't want to add instructions, fair enough :) On ppc64, I
    had to do that to close some nasty race we had in the hash refill, but
    it came almost for free as we already had an atomic loop in there.


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