On Fri, 22 Nov 2013, Sebastian Andrzej Siewior wrote:
> * Nicholas Mc Guire | 2013-11-20 11:21:07 [+0100]:
>
> >diff --git a/include/linux/rwlock_rt.h b/include/linux/rwlock_rt.h
> >index 853ee36..87f5a1d 100644
> >--- a/include/linux/rwlock_rt.h
> >+++ b/include/linux/rwlock_rt.h
> >@@ -53,7 +53,6 @@ extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key
> > #define read_lock_bh(lock) \
> > do { \
> > local_bh_disable(); \
> >- migrate_disable(); \
> > rt_read_lock(lock); \
> > } while (0)
> >
>
> local_bh_disable() does only.
> | add_preempt_count()
>
> Where is that second migrate_disable() comming from?
>
hmmm. am I looking at the wrong code path ?
kernel/softirq.c
void local_bh_disable(void)
{
migrate_disable();
current->softirq_nestcnt++;
}
confused... will check again.
hofrat
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