locking/percpu-rwsem: Extract __percpu_down_read_trylock()

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In preparation for removing the embedded rwsem and building a custom
lock, extract the read-trylock primitive.

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/20200131151540.098485539@infradead.org

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Peter Zijlstra 2019-10-31 12:34:23 +01:00 • committed by Ingo Molnar

parent 71365d4023

commit 75ff64572e

1 changed files with 13 additions and 6 deletions

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kernel/locking/percpu-rwsem.c

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