Probably because you don't use Group Scheduling:
--
#ifdef CONFIG_RT_GROUP_SCHED
init_task_group.rt_runtime = global_rt_runtime();
INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
init_tg_rt_entry(rq, &init_task_group,
&per_cpu(init_rt_rq, i),
&per_cpu(init_sched_rt_entity, i), i, 1);
#endif
--
If you enable it, it tries to initialize the init_task_group.rt_runtime,
but the global_rt_runtime() function has been lost somewhere between -rt3
and -rt4. I sent the patch again, i hope is gonna be in the next -rt
release.
Cheers
Giovanni "ciaby" Civardi
On Mon, 9 Jun 2008 11:55:49 +0200, "Javier Sanz" <jsanza@xxxxxxxxx> wrote:
> Umm,
>
> I think that -rt6 compile ok without you patch, for me, at least ...
>
> Regards
>
> J
>
>
> 2008/6/9 ciaby <ciaby@xxxxxxxxxxxxx>:
>
>>
>> I already sent this patch, but seems that nobody cared... the last 2
>>
>> revisions of the -rt kernel don't compile properly.
>>
>> Second patch to fix this.
>>
>> Regards
>>
>>
>>
>> Giovanni "ciaby" Civardi
>>
>>
>>
>> diff -uNr linux-2.6.25.4-rt6.orig/kernel/sched.c
>>
>> linux-2.6.25.4-rt6/kernel/sched.c
>>
>> --- linux-2.6.25.4-rt6.orig/kernel/sched.c 2008-06-09
>>
>> 11:35:57.000000000 +0200
>>
>> +++ linux-2.6.25.4-rt6/kernel/sched.c 2008-06-09 11:40:45.000000000
> +0200
>>
>> @@ -672,6 +672,13 @@
>>
>> */
>>
>> #define RUNTIME_INF ((u64)~0ULL)
>>
>>
>>
>> +static u64 global_rt_runtime(void)
>>
>> +{
>>
>> + if (sysctl_sched_rt_period < 0)
>>
>> + return RUNTIME_INF;
>>
>> + return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
>>
>> +}
>>
>> +
>>
>> /*
>>
>> * We really dont want to do anything complex within switch_to()
>>
>> * on PREEMPT_RT - this check enforces this.
>>
>>
>>
>> --
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