percpu-rwsem: introduce percpu_down_read_trylock()
Add percpu_down_read_trylock(), it will have the user soon.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
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Add percpu_down_read_trylock(), it will have the user soon.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>