Nicholas Piggin 2f6560e652 powerpc/qspinlock: Optimised atomic_try_cmpxchg_lock() that adds the lock hint ...

This brings the behaviour of the uncontended fast path back to roughly
equivalent to simple spinlocks -- a single atomic op with lock hint.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724131423.1362108-6-npiggin@gmail.com

2020-07-27 00:01:29 +10:00

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