Page cache radix tree slots are usually stabilized by the page lock,
but shmem's swap cookies have no such thing. Because the overall
truncation loop is lockless, the swap entry is currently confirmed by
a tree lookup and then deleted by another tree lookup under the same
tree lock region.
Use
Page cache radix tree slots are usually stabilized by the page lock,
but shmem's swap cookies have no such thing. Because the overall
truncation loop is lockless, the swap entry is currently confirmed by
a tree lookup and then deleted by another tree lookup under the same
tree lock region.
Use
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