Currently the tlb_remove_table_smp_sync IPI is sent to all CPUs
indiscriminately, this causes unnecessary work and delays notable in
real-time use-cases and isolated cpus.
By limiting the IPI to only be sent to cpus referencing the effected
mm and in kernel mode latency is improved.
a config to differentiate architectures that support mm_cpumask from
those that don't will allow safe usage of this feature.

Yair Podemsky (3):
  arch: Introduce ARCH_HAS_CPUMASK_BITS
  mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to MM CPUs
  mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to CPUs in
    kernel mode

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2.31.1