Re: [RFC PATCH for 5.4 0/7] Membarrier fixes and cleanups

[Mathieu Desnoyers]

----- On Sep 25, 2019, at 4:07 AM, Peter Zijlstra peterz@xxxxxxxxxxxxx wrote:

> On Mon, Sep 23, 2019 at 10:55:32AM -0400, Mathieu Desnoyers wrote:
>> ----- On Sep 23, 2019, at 5:06 AM, Peter Zijlstra peterz@xxxxxxxxxxxxx wrote:
>> 
>> > On Thu, Sep 19, 2019 at 01:36:58PM -0400, Mathieu Desnoyers wrote:
>> >> Hi,
>> >> 
>> >> Those series of fixes and cleanups are initially motivated by the report
>> >> of race in membarrier, which can load p->mm->membarrier_state after mm
>> >> has been freed (use-after-free).
>> >> 
>> > 
>> > The lot looks good to me; what do you want done with them (them being
>> > RFC and all) ?
>> 
>> I can either re-send them without the RFC tag, or you can pick them directly
>> through the scheduler tree.
> 
> I've picked them up (and fixed them up, they didn't apply to tip) and
> merge them with Eric's task_rcu_dereference() patches.
> 
> I'll push it out in a bit.

Thanks Peter!

Mathieu


-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com