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SubjectRe: [PATCH 1/19] MUTEX: Introduce simple mutex implementation
Nick Piggin <> wrote:

> atomic_cmpxchg should be available on all platforms.

Two points:

(1) If it's using spinlocks, then it's pointless to use atomic_cmpxchg.

(2) atomic_t is a 32-bit type, and on a 64-bit platform I will want a 64-bit
type so that I can stick the owner address in there (I've got a second
variant not yet released).

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