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Subject[PATCH 31/38] net/decnet: Use time_before, time_before_eq, etc.
From: Julia Lawall <julia@diku.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@diku.dk>
---
diff -r -u -p a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
--- a/net/decnet/af_decnet.c 2007-11-08 08:00:53.000000000 +0100
+++ b/net/decnet/af_decnet.c 2007-12-23 20:30:40.000000000 +0100
@@ -128,6 +128,7 @@ Version 0.0.6 2.1.110 07-aug-98 E
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/poll.h>
+#include <linux/jiffies.h>
#include <net/net_namespace.h>
#include <net/neighbour.h>
#include <net/dst.h>
@@ -601,7 +602,7 @@ int dn_destroy_timer(struct sock *sk)
if (sk->sk_socket)
return 0;

- if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
+ if (time_before_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
dn_unhash_sock(sk);
sock_put(sk);
return 1;
diff -r -u -p a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
--- a/net/decnet/dn_dev.c 2007-12-04 13:19:55.000000000 +0100
+++ b/net/decnet/dn_dev.c 2007-12-23 20:30:40.000000000 +0100
@@ -40,6 +40,7 @@
#include <linux/skbuff.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
+#include <linux/jiffies.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <net/net_namespace.h>
@@ -926,7 +927,7 @@ static void dn_send_endnode_hello(struct
static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
/* First check time since device went up */
- if ((jiffies - dn_db->uptime) < DRDELAY)
+ if (time_before(jiffies, dn_db->uptime + DRDELAY))
return 0;

/* If there is no router, then yes... */
diff -r -u -p a/net/decnet/dn_nsp_out.c b/net/decnet/dn_nsp_out.c
--- a/net/decnet/dn_nsp_out.c 2007-06-02 22:32:45.000000000 +0200
+++ b/net/decnet/dn_nsp_out.c 2007-12-23 20:30:40.000000000 +0100
@@ -61,6 +61,7 @@
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/if_packet.h>
+#include <linux/jiffies.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
@@ -364,7 +365,7 @@ void dn_nsp_queue_xmit(struct sock *sk,
* Slow start: If we have been idle for more than
* one RTT, then reset window to min size.
*/
- if ((jiffies - scp->stamp) > t)
+ if (time_after(jiffies, scp->stamp + t))
scp->snd_window = NSP_MIN_WINDOW;

if (oth)
diff -r -u -p a/net/decnet/dn_route.c b/net/decnet/dn_route.c
--- a/net/decnet/dn_route.c 2007-11-13 16:01:33.000000000 +0100
+++ b/net/decnet/dn_route.c 2007-12-23 20:30:40.000000000 +0100
@@ -76,6 +76,7 @@
#include <linux/netfilter_decnet.h>
#include <linux/rcupdate.h>
#include <linux/times.h>
+#include <linux/jiffies.h>
#include <asm/errno.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
@@ -178,7 +179,7 @@ static void dn_dst_check_expire(unsigned
}
spin_unlock(&dn_rt_hash_table[i].lock);

- if ((jiffies - now) > 0)
+ if (time_after(jiffies, now))
break;
}

diff -r -u -p a/net/decnet/dn_timer.c b/net/decnet/dn_timer.c
--- a/net/decnet/dn_timer.c 2006-11-30 19:05:46.000000000 +0100
+++ b/net/decnet/dn_timer.c 2007-12-23 20:30:40.000000000 +0100
@@ -21,6 +21,7 @@
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
+#include <linux/jiffies.h>
#include <net/sock.h>
#include <asm/atomic.h>
#include <net/flow.h>
@@ -96,7 +97,7 @@ static void dn_slow_timer(unsigned long
* since the last successful transmission.
*/
if (scp->keepalive && scp->keepalive_fxn && (scp->state == DN_RUN)) {
- if ((jiffies - scp->stamp) >= scp->keepalive)
+ if (time_before_eq(jiffies, scp->stamp + scp->keepalive))
scp->keepalive_fxn(sk);
}


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