diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-02-28 05:29:16 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-02-28 05:29:16 -0300 |
commit | 844e3cded9c8665e95b1e43b707a6c3adcbc901f (patch) | |
tree | dd9cccb325c949319a9de3e0cabad91d6261fa75 /include/linux/radix-tree.h | |
parent | 6d461a4fe7896faa1aec5a5417888cf179e46b9f (diff) |
Linux-libre 4.4.3-gnu
Diffstat (limited to 'include/linux/radix-tree.h')
-rw-r--r-- | include/linux/radix-tree.h | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h index 33170dbd9..5d5174b59 100644 --- a/include/linux/radix-tree.h +++ b/include/linux/radix-tree.h @@ -370,12 +370,28 @@ void **radix_tree_next_chunk(struct radix_tree_root *root, struct radix_tree_iter *iter, unsigned flags); /** + * radix_tree_iter_retry - retry this chunk of the iteration + * @iter: iterator state + * + * If we iterate over a tree protected only by the RCU lock, a race + * against deletion or creation may result in seeing a slot for which + * radix_tree_deref_retry() returns true. If so, call this function + * and continue the iteration. + */ +static inline __must_check +void **radix_tree_iter_retry(struct radix_tree_iter *iter) +{ + iter->next_index = iter->index; + return NULL; +} + +/** * radix_tree_chunk_size - get current chunk size * * @iter: pointer to radix tree iterator * Returns: current chunk size */ -static __always_inline unsigned +static __always_inline long radix_tree_chunk_size(struct radix_tree_iter *iter) { return iter->next_index - iter->index; @@ -409,9 +425,9 @@ radix_tree_next_slot(void **slot, struct radix_tree_iter *iter, unsigned flags) return slot + offset + 1; } } else { - unsigned size = radix_tree_chunk_size(iter) - 1; + long size = radix_tree_chunk_size(iter); - while (size--) { + while (--size > 0) { slot++; iter->index++; if (likely(*slot)) |