cmpxchg is not available to generic code

arm:

drivers/char/drm/drm_lock.c: In function `drm_lock_take':
drivers/char/drm/drm_lock.c:221: error: implicit declaration of function `cmpxchg'

You might be able to use atomic_cmpxchg, which _is_ present
on all architectures.  Or use a spinlock.

What's that code doing anyway?  driver-private locking primitives?
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