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authorMatthew Wilcox (Oracle) <willy@infradead.org>2022-09-02 20:46:05 +0100
committerAndrew Morton <akpm@linux-foundation.org>2022-10-03 14:02:46 -0700
commit14d01ee9fcb901c9e020f2dcd71c500f10c3bd03 (patch)
treeea3be38d215f5f82f06d11a1fba8c25d2d0ef8bd /mm/swapfile.c
parent907ea17eb2b436f07332c935476d77893abae735 (diff)
mm/swapfile: remove page_swapcount()
By restructuring folio_swapped(), it can use swap_swapcount() instead of page_swapcount(). It's even a little more efficient. Link: https://lkml.kernel.org/r/20220902194653.1739778-10-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c46
1 files changed, 13 insertions, 33 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 469d9af86be2..e0aaeac5c829 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1431,30 +1431,6 @@ void swapcache_free_entries(swp_entry_t *entries, int n)
spin_unlock(&p->lock);
}
-/*
- * How many references to page are currently swapped out?
- * This does not give an exact answer when swap count is continued,
- * but does include the high COUNT_CONTINUED flag to allow for that.
- */
-static int page_swapcount(struct page *page)
-{
- int count = 0;
- struct swap_info_struct *p;
- struct swap_cluster_info *ci;
- swp_entry_t entry;
- unsigned long offset;
-
- entry.val = page_private(page);
- p = _swap_info_get(entry);
- if (p) {
- offset = swp_offset(entry);
- ci = lock_cluster_or_swap_info(p, offset);
- count = swap_count(p->swap_map[offset]);
- unlock_cluster_or_swap_info(p, ci);
- }
- return count;
-}
-
int __swap_count(swp_entry_t entry)
{
struct swap_info_struct *si;
@@ -1469,11 +1445,16 @@ int __swap_count(swp_entry_t entry)
return count;
}
+/*
+ * How many references to @entry are currently swapped out?
+ * This does not give an exact answer when swap count is continued,
+ * but does include the high COUNT_CONTINUED flag to allow for that.
+ */
static int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry)
{
- int count = 0;
pgoff_t offset = swp_offset(entry);
struct swap_cluster_info *ci;
+ int count;
ci = lock_cluster_or_swap_info(si, offset);
count = swap_count(si->swap_map[offset]);
@@ -1574,17 +1555,16 @@ unlock_out:
static bool folio_swapped(struct folio *folio)
{
- swp_entry_t entry;
- struct swap_info_struct *si;
+ swp_entry_t entry = folio_swap_entry(folio);
+ struct swap_info_struct *si = _swap_info_get(entry);
+
+ if (!si)
+ return false;
if (!IS_ENABLED(CONFIG_THP_SWAP) || likely(!folio_test_large(folio)))
- return page_swapcount(&folio->page) != 0;
+ return swap_swapcount(si, entry) != 0;
- entry = folio_swap_entry(folio);
- si = _swap_info_get(entry);
- if (si)
- return swap_page_trans_huge_swapped(si, entry);
- return false;
+ return swap_page_trans_huge_swapped(si, entry);
}
/*