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Bluetooth: optimize barrier usage for Rmw atomics
Davidlohr Bueso authored 
Use smp_mb__before_atomic() instead of smp_mb() and avoid the
unnecessary barrier for non LL/SC architectures, such as x86.

Signed-off-by: default avatarDavidlohr Bueso <dbueso@suse.de>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
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