| commit | 9b0fc9c09f1b262b7fe697eba6b05095d78850e5 | [log] [tgz] |
|---|---|---|
| author | Michel Lespinasse <walken@google.com> | Tue May 07 06:45:57 2013 -0700 |
| committer | Linus Torvalds <torvalds@linux-foundation.org> | Tue May 07 07:20:16 2013 -0700 |
| tree | 5fb25ae32c9aed77f604858a77a27cd4b37bbfc6 | |
| parent | a7d2c573ae7fad1b2c877d1a1342fa5bb0d6478c [diff] |
rwsem: skip initial trylock in rwsem_down_write_failed We can skip the initial trylock in rwsem_down_write_failed() if there are known active lockers already, thus saving one likely-to-fail cmpxchg. Signed-off-by: Michel Lespinasse <walken@google.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>