1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 43b70d5f8201..98a44376e4f3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1731,8 +1731,12 @@ int in_gate_area_no_mm(unsigned long addr);
 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
 #endif  /* __HAVE_ARCH_GATE_AREA */
 
+#ifdef CONFIG_SYSCTL
+extern int sysctl_drop_caches;
 int drop_caches_sysctl_handler(struct ctl_table *, int,
                                         void __user *, size_t *, loff_t *);
+#endif
+
 unsigned long shrink_slab(struct shrink_control *shrink,
                           unsigned long nr_pages_scanned,
                           unsigned long lru_pages);