The functions time_before, time_before_eq, time_after, and time_after_eq are
more robust for comparing jiffies against other values.
So following patch implements usage of the time_after() macro, defined at
linux/jiffies.h, which deals with wrapping correctly
Cc: [EMAIL PROTECTED]
Signed-off-by: S.Çağlar Onur <[EMAIL PROTECTED]>
---
mm/page_alloc.c | 3 ++-
mm/pdflush.c | 5 +++--
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 75b9793..1a0c9cc 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -14,6 +14,7 @@
* (lots of bits borrowed from Ingo Molnar & Andrew Morton)
*/
+#include <linux/jiffies.h>
#include <linux/stddef.h>
#include <linux/mm.h>
#include <linux/swap.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;
}
diff --git a/mm/pdflush.c b/mm/pdflush.c
index 8f6ee07..5d736d5 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -10,6 +10,7 @@
* up stack space with nested calls to kernel_thread.
*/
+#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/signal.h>
@@ -130,7 +131,7 @@ static int __pdflush(struct pdflush_work *my_work)
* Thread creation: For how long have there been zero
* available threads?
*/
- if (jiffies - last_empty_jifs > 1 * HZ) {
+ if (time_after(jiffies, last_empty_jifs + HZ)) {
/* unlocked list_empty() test is OK here */
if (list_empty(&pdflush_list)) {
/* unlocked test is OK here */
@@ -151,7 +152,7 @@ static int __pdflush(struct pdflush_work *my_work)
if (nr_pdflush_threads <= MIN_PDFLUSH_THREADS)
continue;
pdf = list_entry(pdflush_list.prev, struct pdflush_work, list);
- if (jiffies - pdf->when_i_went_to_sleep > 1 * HZ) {
+ if (time_after(jiffies, pdf->when_i_went_to_sleep + HZ)) {
/* Limit exit rate */
pdf->when_i_went_to_sleep = jiffies;
break; /* exeunt */
--
1.5.3.7
--
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