Re: [PATCH v8 7/8] sched/core: Prevent race condition between cpuset and __sched_setscheduler()

[Peter Zijlstra]

On Fri, Jun 28, 2019 at 10:06:17AM +0200, Juri Lelli wrote:
> No synchronisation mechanism exists between the cpuset subsystem and
> calls to function __sched_setscheduler(). As such, it is possible that
> new root domains are created on the cpuset side while a deadline
> acceptance test is carried out in __sched_setscheduler(), leading to a
> potential oversell of CPU bandwidth.
> 
> Grab cpuset_rwsem read lock from core scheduler, so to prevent
> situations such as the one described above from happening.
> 

ISTR there being a funny vs normalize_rt_tasks(); maybe mention that?