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SubjectRe: [PATCH v9 1/2] arch/*: Add CONFIG_ARCH_HAVE_CMPXCHG64
> + bool

64-bit architectures must support this as long is 64-bits wide.

So this should have a

default y if 64BIT

which also means you only need to explicitly select in on 32-bit
architectures that support 64-bit cmpxchg.

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