Messages in this thread Patch in this message | | | Date | Wed, 1 Aug 2018 09:19:42 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH RT] sched: drop is_special_task_state() check from __set_current_state_no_track() |
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On Wed, 1 Aug 2018 11:05:25 +0200 Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> The is_special_task_state() check in __set_current_state_no_track() > has been wrongly placed. __set_current_state_no_track() is used in RT > while a sleeping lock is acquired. It is used at the begin of the wait > loop with TASK_UNINTERRUPTIBLE and while leaving it and restoring the > original state. The latter part triggers the warning. > > Drop the special state check. This is only used within the sleeping lock > implementation and the assignment happens while the PI lock is held. > While at it, drop set_current_state_no_track() because it has no users. > > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > --- > include/linux/sched.h | 8 -------- > 1 file changed, 8 deletions(-) > > diff --git a/include/linux/sched.h b/include/linux/sched.h > index a0c1c0cae992..b20264e17b02 100644 > --- a/include/linux/sched.h > +++ b/include/linux/sched.h > @@ -132,16 +132,9 @@ struct task_group; > > #define __set_current_state_no_track(state_value) \ > do { \ > - WARN_ON_ONCE(is_special_task_state(state_value));\ > current->state = (state_value); \ > } while (0)
I don't think we need to keep the do { } while with a single line. It is now equivalent to the non-debug version of __set_current_state() which is defined as:
#define __set_current_state(state_value) \ current->state = (state_value)
-- Steve
> > -#define set_current_state_no_track(state_value) \ > - do { \ > - WARN_ON_ONCE(is_special_task_state(state_value));\ > - smp_store_mb(current->state, (state_value)); \ > - } while (0) > - > #define set_special_state(state_value) \ > do { \ > unsigned long flags; /* may shadow */ \ > @@ -196,7 +189,6 @@ struct task_group; > smp_store_mb(current->state, (state_value)) > > #define __set_current_state_no_track(state_value) __set_current_state(state_value) > -#define set_current_state_no_track(state_value) set_current_state(state_value) > > /* > * set_special_state() should be used for those states when the blocking task
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