linux-kernel - [PATCH 1/38] arch/alpha: Use time_before, time_before

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Message-ID: <Pine.LNX.4.64.0712241516010.23999@ask.diku.dk>
Date:	Mon, 24 Dec 2007 15:16:46 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	rth@...ddle.net, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 1/38] arch/alpha: Use time_before, time_before_eq, etc.

From: Julia Lawall <julia@...u.dk>

The functions time_before, time_before_eq, time_after, and time_after_eq
are more robust for comparing jiffies against other values.

A simplified version of the semantic patch making this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@ change_compare_np @
expression E;
@@

(
- jiffies <= E
+ time_before_eq(jiffies,E)
|
- jiffies >= E
+ time_after_eq(jiffies,E)
|
- jiffies < E
+ time_before(jiffies,E)
|
- jiffies > E
+ time_after(jiffies,E)
)

@ include depends on change_compare_np @
@@

#include <linux/jiffies.h>

@ no_include depends on !include && change_compare_np @
@@

  #include <linux/...>
+ #include <linux/jiffies.h>
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>
---

diff -r -u -p a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
--- a/arch/alpha/kernel/traps.c	2007-10-22 11:24:57.000000000 +0200
+++ b/arch/alpha/kernel/traps.c	2007-12-23 20:30:39.000000000 +0100
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kallsyms.h>
+#include <linux/jiffies.h>
 
 #include <asm/gentrap.h>
 #include <asm/uaccess.h>
@@ -781,7 +782,7 @@ do_entUnaUser(void __user * va, unsigned
 	   with the unaliged access.  */
 
 	if (!test_thread_flag (TIF_UAC_NOPRINT)) {
-		if (cnt >= 5 && jiffies - last_time > 5*HZ) {
+		if (cnt >= 5 && time_after(jiffies, last_time + 5*HZ)) {
 			cnt = 0;
 		}
 		if (++cnt < 5) {
--
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