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authorPeter Zijlstra <peterz@infradead.org>2018-08-22 17:30:14 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-09 20:01:23 +0200
commit04d1d58c274996163c7c7d659336cedbade30761 (patch)
tree5f2b06e72e613764034c7e538f469c83e1807036 /lib/iomap_copy.c
parent7c439bc2220d624fc7edba4c9bdc1d65b4f47f26 (diff)
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mm/tlb: Remove tlb_remove_table() non-concurrent condition
commit a6f572084fbee8b30f91465f4a085d7a90901c57 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/iomap_copy.c')
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