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| author | Michel Lespinasse <walken@google.com> | 2013-05-07 06:45:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-07 07:20:16 -0700 |
| commit | 9b0fc9c09f1b262b7fe697eba6b05095d78850e5 (patch) | |
| tree | 5fb25ae32c9aed77f604858a77a27cd4b37bbfc6 /lib/rwsem-spinlock.c | |
| parent | a7d2c573ae7fad1b2c877d1a1342fa5bb0d6478c (diff) | |
| download | op-kernel-dev-9b0fc9c09f1b262b7fe697eba6b05095d78850e5.zip op-kernel-dev-9b0fc9c09f1b262b7fe697eba6b05095d78850e5.tar.gz | |
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>
Diffstat (limited to 'lib/rwsem-spinlock.c')
0 files changed, 0 insertions, 0 deletions
