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authorMatthew Wilcox <willy@infradead.org>2017-12-04 10:16:10 -0500
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:46:38 -0400
commitaa5dc07f70c50a3c56bf3fa07bde0b22a95aa381 (patch)
tree68af27b08106f5652afd22129b57804dd94c411e /mm/huge_memory.c
parent89eb946a7432be639b452fac295c0c2e5186c4a4 (diff)
downloadlinux-aa5dc07f70c50a3c56bf3fa07bde0b22a95aa381.tar.bz2
mm: Convert huge_memory to XArray
Quite a straightforward conversion. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 533f9b00147d..9eb79c384616 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2443,13 +2443,13 @@ static void __split_huge_page(struct page *page, struct list_head *list,
ClearPageCompound(head);
/* See comment in __split_huge_page_tail() */
if (PageAnon(head)) {
- /* Additional pin to radix tree of swap cache */
+ /* Additional pin to swap cache */
if (PageSwapCache(head))
page_ref_add(head, 2);
else
page_ref_inc(head);
} else {
- /* Additional pin to radix tree */
+ /* Additional pin to page cache */
page_ref_add(head, 2);
xa_unlock(&head->mapping->i_pages);
}
@@ -2561,7 +2561,7 @@ bool can_split_huge_page(struct page *page, int *pextra_pins)
{
int extra_pins;
- /* Additional pins from radix tree */
+ /* Additional pins from page cache */
if (PageAnon(page))
extra_pins = PageSwapCache(page) ? HPAGE_PMD_NR : 0;
else
@@ -2657,17 +2657,14 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
spin_lock_irqsave(zone_lru_lock(page_zone(head)), flags);
if (mapping) {
- void **pslot;
+ XA_STATE(xas, &mapping->i_pages, page_index(head));
- xa_lock(&mapping->i_pages);
- pslot = radix_tree_lookup_slot(&mapping->i_pages,
- page_index(head));
/*
- * Check if the head page is present in radix tree.
+ * Check if the head page is present in page cache.
* We assume all tail are present too, if head is there.
*/
- if (radix_tree_deref_slot_protected(pslot,
- &mapping->i_pages.xa_lock) != head)
+ xa_lock(&mapping->i_pages);
+ if (xas_load(&xas) != head)
goto fail;
}