zlc_setup(): handle jiffies wraparound

[linux-2.6-omap-h63xx.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8896e874a67dae2c558034dbbf27491b231c2b2a..e76cf94725c9dcb9851d091434fac30888265c53 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -19,6 +19,7 @@
 #include <linux/swap.h>
 #include <linux/interrupt.h>
 #include <linux/pagemap.h>
+#include <linux/jiffies.h>
 #include <linux/bootmem.h>
 #include <linux/compiler.h>
 #include <linux/kernel.h>
@@ -1276,7 +1277,7 @@ static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags)
        if (!zlc)
                return NULL;
 
-       if (jiffies - zlc->last_full_zap > 1 * HZ) {
+       if (time_after(jiffies, zlc->last_full_zap + HZ)) {
                bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
                zlc->last_full_zap = jiffies;
        }