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| author | Peter Zijlstra | 2018-08-22 17:30:14 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2018-08-23 20:55:58 +0200 |
| commit | a6f572084fbee8b30f91465f4a085d7a90901c57 (patch) | |
| tree | edfe14d7b24d0c54599e90ee493542be8a0411e9 /arch/Kconfig | |
| parent | mm: move tlb_table_flush to tlb_flush_mmu_free (diff) | |
| download | kernel-qcow2-linux-a6f572084fbee8b30f91465f4a085d7a90901c57.tar.gz kernel-qcow2-linux-a6f572084fbee8b30f91465f4a085d7a90901c57.tar.xz kernel-qcow2-linux-a6f572084fbee8b30f91465f4a085d7a90901c57.zip | |
mm/tlb: Remove tlb_remove_table() non-concurrent condition
Will noted that only checking mm_users is incorrect; we should also
check mm_count in order to cover CPUs that have a lazy reference to
this mm (and could do speculative TLB operations).
If removing this turns out to be a performance issue, we can
re-instate a more complete check, but in tlb_table_flush() eliding the
call_rcu_sched().
Fixes: 267239116987 ("mm, powerpc: move the RCU page-table freeing into generic code")
Reported-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rik van Riel <riel@surriel.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/Kconfig')
0 files changed, 0 insertions, 0 deletions