diff -urN linux-2.5.12-percpu/net/socket.c linux/net/socket.c
--- linux-2.5.12-percpu/net/socket.c	Wed Apr 10 19:59:40 2002
+++ linux/net/socket.c	Wed May  1 11:59:25 2002
@@ -74,6 +74,7 @@
 #include <linux/cache.h>
 #include <linux/module.h>
 #include <linux/highmem.h>
+#include <linux/percpu.h>
 
 #if defined(CONFIG_KMOD) && defined(CONFIG_NET)
 #include <linux/kmod.h>
@@ -181,10 +182,7 @@
  *	Statistics counters of the socket lists
  */
 
-static union {
-	int	counter;
-	char	__pad[SMP_CACHE_BYTES];
-} sockets_in_use[NR_CPUS] __cacheline_aligned = {{0}};
+static int __per_cpu_data sockets_in_use;
 
 /*
  *	Support routines. Move socket addresses back and forth across the kernel/user
@@ -498,7 +496,7 @@
 	inode->i_uid = current->fsuid;
 	inode->i_gid = current->fsgid;
 
-	sockets_in_use[smp_processor_id()].counter++;
+	this_cpu(sockets_in_use)++;
 	return sock;
 }
 
@@ -530,7 +528,7 @@
 	if (sock->fasync_list)
 		printk(KERN_ERR "sock_release: fasync list not empty!\n");
 
-	sockets_in_use[smp_processor_id()].counter--;
+	this_cpu(sockets_in_use)--;
 	if (!sock->file) {
 		iput(SOCK_INODE(sock));
 		return;
@@ -1774,7 +1772,7 @@
 	int counter = 0;
 
 	for (cpu=0; cpu<smp_num_cpus; cpu++)
-		counter += sockets_in_use[cpu_logical_map(cpu)].counter;
+		counter += per_cpu(sockets_in_use,cpu_logical_map(cpu));
 
 	/* It can be negative, by the way. 8) */
 	if (counter < 0)