* Waiman Long <waiman.l...@hp.com> wrote:
> On 04/18/2014 03:46 AM, Ingo Molnar wrote:
> >* Waiman Long<waiman.l...@hp.com> wrote:
> >
> >>On 04/17/2014 11:58 AM, Peter Zijlstra wrote:
> >>>On Thu, Apr 17, 2014 at 11:03:57AM -0400, Waiman Long wrote:
> >>>>+static __always_inline void
> >>>>+clear_pending_set_locked(struct qspinlock *lock, u32 val)
> >>>>+{
> >>>>+ struct __qspinlock *l = (void *)lock;
> >>>>+
> >>>>+ ACCESS_ONCE(l->locked_pending) = 1;
> >>>>+}
> >>>>@@ -157,8 +251,13 @@ static inline int trylock_pending(struct qspinlock
> >>>>*lock, u32 *pval)
> >>>> * we're pending, wait for the owner to go away.
> >>>> *
> >>>> * *,1,1 -> *,1,0
> >>>>+ *
> >>>>+ * this wait loop must be a load-acquire such that we match the
> >>>>+ * store-release that clears the locked bit and create lock
> >>>>+ * sequentiality; this because not all try_clear_pending_set_locked()
> >>>>+ * implementations imply full barriers.
> >>>You renamed the function referred in the above comment.
> >>>
> >>Sorry, will fix the comments.
> >I suggest not renaming the function instead.
> >try_clear_pending_set_locked() tells the intent in a clearer fashion.
> >
> >Thanks,
> >
> > Ingo
>
> I usually use the word "try" if there is a possibility of failure.
> However, the function will always succeed, albeit by waiting a bit
> in some cases. That is why I remove "try" from the name.
Fair enough!
Thanks,
Ingo
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