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authorMatthew Wilcox <willy@infradead.org>2017-12-04 03:28:00 -0500
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:46:40 -0400
commit7ae3424fb4b5587d9b2db12a4b1040c52073dd5c (patch)
tree0b827f9645b9aa2b1cd40dd3df28256038f3f8a4 /mm/shmem.c
parentc121d3bb717ee932caf031c6a7923547f7f83163 (diff)
shmem: Convert shmem_partial_swap_usage to XArray
Simpler code because the xarray takes care of things like the limit and dereferencing the slot. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c18
1 files changed, 4 insertions, 14 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 8e9bbfb7ed15..5588205f4259 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -676,29 +676,19 @@ static int shmem_free_swap(struct address_space *mapping,
unsigned long shmem_partial_swap_usage(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
- struct radix_tree_iter iter;
- void __rcu **slot;
+ XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
unsigned long swapped = 0;
rcu_read_lock();
-
- radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start) {
- if (iter.index >= end)
- break;
-
- page = radix_tree_deref_slot(slot);
-
- if (radix_tree_deref_retry(page)) {
- slot = radix_tree_iter_retry(&iter);
+ xas_for_each(&xas, page, end - 1) {
+ if (xas_retry(&xas, page))
continue;
- }
-
if (xa_is_value(page))
swapped++;
if (need_resched()) {
- slot = radix_tree_iter_resume(slot, &iter);
+ xas_pause(&xas);
cond_resched_rcu();
}
}