On Tue, Jun 11, 2019 at 03:11:31PM +0200, Peter Zijlstra wrote:
> On Mon, May 20, 2019 at 04:59:15PM -0400, Waiman Long wrote:
>
> > +static inline long rwsem_read_trylock(struct rw_semaphore *sem, long *cnt)
> > +{
> > + long adjustment = -RWSEM_READER_BIAS;
> > +
> > + *cnt = atomic_long_fet
On Mon, May 20, 2019 at 04:59:15PM -0400, Waiman Long wrote:
> static struct rw_semaphore __sched *
> +rwsem_down_read_slowpath(struct rw_semaphore *sem, int state, long
> adjustment)
> {
> + long count;
> bool wake = false;
> struct rwsem_waiter waiter;
> DEFINE_WAKE_Q(wak
On Mon, May 20, 2019 at 04:59:15PM -0400, Waiman Long wrote:
> +static inline long rwsem_read_trylock(struct rw_semaphore *sem, long *cnt)
> +{
> + long adjustment = -RWSEM_READER_BIAS;
> +
> + *cnt = atomic_long_fetch_add_acquire(RWSEM_READER_BIAS, &sem->count);
I'm thinking we'd actuall
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