mm: shmem: change the return value of shmem_find_swap_entries()

The shmem_find_swap_entries() originally returned the index corresponding
to the swap entry, but no callers used this return value.  It should
return the number of entries that were found like other functions, which
can be used by the callers.

No functional changes.

Link: https://lkml.kernel.org/r/070489b5946b8379b2a2d25f78115cef167cd145.1738918357.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 51bdeea..f5a0815 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1379,9 +1379,9 @@ static void shmem_evict_inode(struct inode *inode)
 #endif
 }
 
-static int shmem_find_swap_entries(struct address_space *mapping,
-                                  pgoff_t start, struct folio_batch *fbatch,
-                                  pgoff_t *indices, unsigned int type)
+static unsigned int shmem_find_swap_entries(struct address_space *mapping,
+                               pgoff_t start, struct folio_batch *fbatch,
+                               pgoff_t *indices, unsigned int type)
 {
        XA_STATE(xas, &mapping->i_pages, start);
        struct folio *folio;
@@ -1414,7 +1414,7 @@ static int shmem_find_swap_entries(struct address_space *mapping,
        }
        rcu_read_unlock();
 
-       return xas.xa_index;
+       return folio_batch_count(fbatch);
 }
 
 /*
@@ -1461,8 +1461,8 @@ static int shmem_unuse_inode(struct inode *inode, unsigned int type)
 
        do {
                folio_batch_init(&fbatch);
-               shmem_find_swap_entries(mapping, start, &fbatch, indices, type);
-               if (folio_batch_count(&fbatch) == 0) {
+               if (!shmem_find_swap_entries(mapping, start, &fbatch,
+                                            indices, type)) {
                        ret = 0;
                        break;
                }