powerpc/64s/radix: serialize_against_pte_lookup IPIs trim mm_cpumask

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serialize_against_pte_lookup() performs IPIs to all CPUs in mm_cpumask.
Take this opportunity to try trim the CPU out of mm_cpumask. This can
reduce the cost of future serialize_against_pte_lookup() and/or the
cost of future TLB flushes.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201217134731.488135-7-npiggin@gmail.com

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Nicholas Piggin 2020-12-17 23:47:30 +10:00 • committed by Michael Ellerman

parent 9393544842

commit 032b7f0893

2 changed files with 23 additions and 10 deletions

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13

arch/powerpc/mm/book3s64/pgtable.c

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20

arch/powerpc/mm/book3s64/radix_tlb.c

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