[RFC PATCH 3/5] asm-generic/bitops/atomic.h: Rewrite using atomic_fetch_*

[Peter Zijlstra]

On Mon, Feb 19, 2018 at 02:01:51PM +0000, Will Deacon wrote:
> If it's defined, then we could consider using cmpxchg64 to build atomic64
> instead of the locks. But even then, I'm not sure we're really helping
> anybody out in practice.

yeah, most 64bit archs have more atomics or ll/sc and would not use it
anyway I suppose.