linuxkpi: Add cmpxchg64() in <asm/atomic.h>
Differential Revision: https://reviews.freebsd.org/D36966
(cherry picked from commit e79a57d4ecb73b7e779260b80f7b747eb29ce4d2)
linuxkpi: Add `cmpxchg64()` in <asm/atomic.h> Tags None Referenced Files None Subscribers None
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