[PATCH v2] add time_now_after and other macros which compare with jiffies

[Dave Young <hidave.darkstar@gmail.com>]

Changes from previous version:
1. Add comments
2. Change names easy to understand. For example, now time_now_after(a) means time now after a will return true.

---
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>

---
include/linux/jiffies.h |   16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff -upr linux/include/linux/jiffies.h linux.new/include/linux/jiffies.h
--- linux/include/linux/jiffies.h	2008-03-07 19:56:02.000000000 +0800
+++ linux.new/include/linux/jiffies.h	2008-03-07 20:10:25.000000000 +0800
@@ -135,6 +135,22 @@ static inline u64 get_jiffies_64(void)
 #define time_before_eq64(a,b)	time_after_eq64(b,a)
 
 /*
+ * These four macros compare jiffies and 'a' for convenience.
+ */
+
+/* time_now_after(a) return true if now (jiffies) is after a */
+#define time_now_after(a) time_after(jiffies, a)
+
+/* time_now_before(a) return true if now (jiffies) is before a */
+#define time_now_before(a) time_before(jiffies, a)
+
+/* time_now_after_eq(a) return true if now (jiffies) is after or equal to a */
+#define time_now_after_eq(a) time_after_eq(jiffies, a)
+
+/* time_now_before_eq(a) return true if now (jiffies) is before or equal to a */
+#define time_now_before_eq(a) time_before_eq(jiffies, a)
+
+/*
  * Have the 32 bit jiffies value wrap 5 minutes after boot
  * so jiffies wrap bugs show up earlier.
  */