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    SubjectRe: Why Semaphore Hardware-Dependent?
    Christoph Lameter <> wrote:

    > > Some of these have LL/SC or equivalent instead, but ARM5 and before, FRV,
    > > M68K before 68020 to name but a few.
    > This is all pretty ancient hardware, right? And they are mostly single
    > processor so no need to worry about concurrency. Just disable interrupts.

    No, they're not all ancient h/w, and "just disabling interrupts" can be really

    > > And anything that implements CMPXCHG with spinlocks is a really bad
    > > candidate for CMPXCHG-based rwsems.
    > Those will optimize out if it is a single processor configuration.

    Not necessarily. Consider preemption.

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