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    SubjectRe: Why Semaphore Hardware-Dependent?
    Date
    Ralf Baechle <ralf@linux-mips.org> wrote:

    > > Which arches do not support cmpxchg?
    >
    > MIPS, Alpha - probably any pure RISC load/store architecture.

    Some of these have LL/SC or equivalent instead, but ARM5 and before, FRV, M68K
    before 68020 to name but a few.

    And anything that implements CMPXCHG with spinlocks is a really bad candidate
    for CMPXCHG-based rwsems.

    David
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