| Date | Wed, 16 Jun 2021 14:08:31 -0400 (EDT) | From | Mathieu Desnoyers <> | Subject | Re: [PATCH 5/8] membarrier, kthread: Use _ONCE accessors for task->mm |
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----- On Jun 15, 2021, at 11:21 PM, Andy Lutomirski luto@kernel.org wrote:
> membarrier reads cpu_rq(remote cpu)->curr->mm without locking. Use > READ_ONCE() and WRITE_ONCE() to remove the data races.
I notice that kernel/exit.c:exit_mm() also has:
current->mm = NULL;
I suspect you may want to add a WRITE_ONCE() there as well ?
Thanks,
Mathieu
-- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
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