Re: [PATCH v2 07/13] rwsem: use cmpxchg for trying to steal write lock

2013-03-28 Thread Rik van Riel
On 03/15/2013 06:54 AM, Michel Lespinasse wrote: Using rwsem_atomic_update to try stealing the write lock forced us to undo the adjustment in the failure path. We can have simpler and faster code by using cmpxchg instead. Signed-off-by: Michel Lespinasse Acked-by: Rik van Riel -- To unsubsc

Re: [PATCH v2 07/13] rwsem: use cmpxchg for trying to steal write lock

2013-03-28 Thread Peter Hurley
On Fri, 2013-03-15 at 03:54 -0700, Michel Lespinasse wrote: > Using rwsem_atomic_update to try stealing the write lock forced us to > undo the adjustment in the failure path. We can have simpler and faster > code by using cmpxchg instead. > > Signed-off-by: Michel Lespinasse > > --- > lib/rwsem

[PATCH v2 07/13] rwsem: use cmpxchg for trying to steal write lock

2013-03-15 Thread Michel Lespinasse
Using rwsem_atomic_update to try stealing the write lock forced us to undo the adjustment in the failure path. We can have simpler and faster code by using cmpxchg instead. Signed-off-by: Michel Lespinasse --- lib/rwsem.c | 26 ++ 1 file changed, 6 insertions(+), 20 dele