------- Comment #4 from pinskia at gcc dot gnu dot org 2006-11-12 08:35 -------
The only thing left from __task_rq_lock is a label.
If we look at that inlined function, we see:
static inline __attribute__((always_inline)) struct rq *__task_rq_lock(struct
task_struct *p)
{
struct rq *rq;
repeat_lock_task:
rq = (&(*((void)((task_cpu(p))), &per_cpu__runqueues)));
do { do { } while (0); (void)0; (void)(&rq->lock); } while (0);
if (__builtin_expect(!!(rq != (&(*((void)((task_cpu(p))),
&per_cpu__runqueues)))), 0)) {
do { do { } while (0); (void)0; (void)(&rq->lock); } while (0);
goto repeat_lock_task;
}
return rq;
}
the if is never true as rq is always equal to &per_cpu__runqueues. The calls to
task_cpu were inlined and we constant proped the value of rq the first of the
way through the function which we inlined this to.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29792
