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-rw-r--r--mm/vmscan.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2880396f7953..e097c1026b58 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3499,6 +3499,7 @@ int page_evictable(struct page *page, struct vm_area_struct *vma)
return 1;
}
+#ifdef CONFIG_SHMEM
/**
* check_move_unevictable_page - check page for evictability and move to appropriate zone lru list
* @page: page to check evictability and move to appropriate lru list
@@ -3509,6 +3510,8 @@ int page_evictable(struct page *page, struct vm_area_struct *vma)
*
* Restrictions: zone->lru_lock must be held, page must be on LRU and must
* have PageUnevictable set.
+ *
+ * This function is only used for SysV IPC SHM_UNLOCK.
*/
static void check_move_unevictable_page(struct page *page, struct zone *zone)
{
@@ -3545,6 +3548,8 @@ retry:
*
* Scan all pages in mapping. Check unevictable pages for
* evictability and move them to the appropriate zone lru list.
+ *
+ * This function is only used for SysV IPC SHM_UNLOCK.
*/
void scan_mapping_unevictable_pages(struct address_space *mapping)
{
@@ -3590,9 +3595,14 @@ void scan_mapping_unevictable_pages(struct address_space *mapping)
pagevec_release(&pvec);
count_vm_events(UNEVICTABLE_PGSCANNED, pg_scanned);
+ cond_resched();
}
-
}
+#else
+void scan_mapping_unevictable_pages(struct address_space *mapping)
+{
+}
+#endif /* CONFIG_SHMEM */
static void warn_scan_unevictable_pages(void)
{