locking/percpu-rwsem: Move __this_cpu_inc() into the slowpath
As preparation to rework __percpu_down_read() move the __this_cpu_inc() into it. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Davidlohr Bueso <dbueso@suse.de> Acked-by: Will Deacon <will@kernel.org> Acked-by: Waiman Long <longman@redhat.com> Tested-by: Juri Lelli <juri.lelli@redhat.com> Link: https://lkml.kernel.org/r/20200131151540.041600199@infradead.org
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Ingo Molnar

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@@ -47,6 +47,8 @@ EXPORT_SYMBOL_GPL(percpu_free_rwsem);
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bool __percpu_down_read(struct percpu_rw_semaphore *sem, bool try)
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{
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__this_cpu_inc(*sem->read_count);
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/*
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* Due to having preemption disabled the decrement happens on
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* the same CPU as the increment, avoiding the
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