Re: [PATCH 1/2] events/core: introduce perf_pmu_disable_all() to turn off all PMU

[Peter Zijlstra]

On Mon, Nov 23, 2020 at 01:37:25PM +0800, Pingfan Liu wrote:

> +/* When crashed, other cpus hang in idle loop, so here do an emergency job 
> under no lock */

-ENOPARSE, -ETOOLONG

> +void perf_pmu_disable_all(void)
> +{
> +     struct pmu *pmu;
> +
> +     list_for_each_entry(pmu, &pmus, entry)
> +             if (pmu->pmu_disable)
> +                     pmu->pmu_disable(pmu);
> +}

This violates both locking rules and coding style.