Messages in this thread | | | Date | Thu, 18 Jun 2015 13:00:14 -0700 | From | Dave Hansen <> | Subject | Re: [PATCH v1 2/2] x86, perf,cqm: handle CPU hotplug |
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On 06/18/2015 12:47 PM, Thomas Gleixner wrote: >> > @@ -1239,12 +1239,15 @@ static inline void cqm_pick_event_reader(int cpu) >> > int phys_id = topology_physical_package_id(cpu); >> > int i; >> > >> > + mutex_lock(&cache_mutex); > I already explained it to Vikas. You CANNOT take a mutex in that code > path as it runs with interrupts disabled on a CPU which cannot > schedule.
How did lockdep not blow up and scream about this?
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