Tested with linux-2.6.16-gentoo-r13, linux-2.6.25-gentoo-r9, linux-2.6.26-gentoo-r4, linux-2.6.27-gentoo-r10, 
linux-2.6.28-gentoo-r6, linux-2.6.29-gentoo-r6, linux-2.6.30-gentoo-r9, linux-2.6.32-gentoo-r4, linux-2.6.32-gentoo-r5

diff -ru exmap-0.10.orig/work/exmap-0.10/kernel/exmap.c exmap-0.10/work/exmap-0.10/kernel/exmap.c
--- kernel/exmap.c	2006-09-28 18:52:25.000000000 +0200
+++ kernel/exmap.c	2010-02-17 16:15:04.000000000 +0100
@@ -392,7 +392,11 @@
 	struct task_struct *tsk;
 	int errcode = -EINVAL;
 
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
+	tsk = pid_task(find_pid_ns(pid, &init_pid_ns), PIDTYPE_PID);
+	#else
 	tsk = find_task_by_pid(pid);
+	#endif
 	if (tsk == NULL) {
 		printk (KERN_ALERT
 			"/proc/%s: can't find task for pid %d\n",
@@ -507,7 +511,11 @@
 							NULL);
 
 	if (exmap_proc_file == NULL) {
+		#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+		remove_proc_entry (PROCFS_NAME, NULL);
+		#else
 		remove_proc_entry (PROCFS_NAME, &proc_root);
+		#endif
 		printk (KERN_ALERT "/proc/%s: could not initialize\n",
 			PROCFS_NAME);
 		return -ENOMEM;
@@ -523,7 +523,9 @@
 	
 	exmap_proc_file->read_proc = procfile_read;
 	exmap_proc_file->write_proc = procfile_write;
+	#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,29)
 	exmap_proc_file->owner = THIS_MODULE;
+	#endif
 	
 	/*     exmap_proc_file->mode         = S_IFREG | S_IRUGO; */
 	/* TODO - this is quite probably a security problem */
@@ -532,5 +540,9 @@
 void cleanup_module ()
 {
 	printk (KERN_INFO "/proc/%s: remove\n", PROCFS_NAME);
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+	remove_proc_entry (PROCFS_NAME, NULL);
+	#else
 	remove_proc_entry (PROCFS_NAME, &proc_root);
+	#endif
 }