On Mon, Jul 24, 2017 at 09:41:39PM -0700, Andy Lutomirski wrote: > + /* > + * Resume remote flushes and then read tlb_gen. The > + * implied barrier in atomic64_read() synchronizes
There is no barrier in atomic64_read(). > + * with inc_mm_tlb_gen() like this: > + * > + * switch_mm_irqs_off(): flush request: > + * cpumask_set_cpu(...); inc_mm_tlb_gen(); > + * MB MB > + * atomic64_read(.tlb_gen); flush_tlb_others(mm_cpumask()); > + */ > cpumask_set_cpu(cpu, mm_cpumask(next)); > next_tlb_gen = atomic64_read(&next->context.tlb_gen); >
