[RFC PATCH 0/6] Implement MMU_LAZY_TLB_SHOOTDOWN for alpha

[Nicholas Piggin <npiggin@gmail.com>]

Hi,

I started looking at alpha TLB flushing a while back with the aim of
converting another architecture to this option. powerpc has fairly
complicated MMU and TLB code so I thought it would be good to have a
simpler reference architecture.

alpha had SMP QEMU support, TLB flushing that's fairly simple, and it
doesn't use mm_cpumask in a complicated way, so it fits.

These patches work for me, but only tested on QEMU so that's not saying
too much when it comes to race conditions, so some healthy skepticism
is recommended.

Any thoughts about the series would be interesting to hear.

Thanks,
Nick

Nicholas Piggin (6):
  alpha: remove extern inline from mmu_context
  alpha: implement simple mm_cpumask TLB flush filter
  alpha: remove TLB flushing mm_users special case
  alpha: clean mm_cpumask when flushing TLBs
  alpha: enable MMU_LAZY_TLB_SHOOTDOWN
  alpha: shoot the lazy tlb mm when flushing TLBs

 arch/alpha/Kconfig                   |   1 +
 arch/alpha/include/asm/mmu_context.h |  43 +++++-----
 arch/alpha/include/asm/tlbflush.h    |   3 +
 arch/alpha/kernel/smp.c              | 120 ++++++++++++++-------------
 arch/alpha/mm/init.c                 |   2 +
 5 files changed, 94 insertions(+), 75 deletions(-)

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2.40.1