Re: [PATCH v7 4/7] sched/core: Prevent race condition between cpuset and __sched_setscheduler()

[Peter Zijlstra]

On Wed, Apr 03, 2019 at 10:46:47AM +0200, Juri Lelli wrote:
> +static inline void cpuset_read_only_lock(unsigned long *flags)
> +{
> +	local_irq_save(*flags);
> +	preempt_disable();
> +}
> +
> +static inline void cpuset_read_only_unlock(unsigned long *flags)
> +{
> +	local_irq_restore(*flags);
> +	preempt_enable();
> +}

You can ditch the preempt stuff. IRQs disabled already very much implies
!preemptible.