diff --git a/init/main.c b/init/main.c

index 7449819..98cfaae 100644

--- a/init/main.c

+++ b/init/main.c

@@ -369,6 +369,10 @@ static void __init setup_nr_cpu_ids(void)

 	nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;

 }

+#include <linux/ext3_fs_i.h>

+#include <linux/skbuff.h>

+#include <linux/sched.h>

+

 /* Called by boot processor to activate the rest. */

 static void __init smp_init(void)

 {

@@ -391,6 +395,15 @@ static void __init smp_init(void)

 	/* Any cleanup work */

 	printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());

 	smp_cpus_done(setup_max_cpus);

+

+	printk(KERN_DEBUG "sizeof(vma)=%u bytes\n", (unsigned int) sizeof(struct vm_area_struct));

+	printk(KERN_DEBUG "sizeof(page)=%u bytes\n", (unsigned int) sizeof(struct page));

+	printk(KERN_DEBUG "sizeof(inode)=%u bytes\n", (unsigned int) sizeof(struct inode));

+	printk(KERN_DEBUG "sizeof(dentry)=%u bytes\n", (unsigned int) sizeof(struct dentry));

+	printk(KERN_DEBUG "sizeof(ext3inode)=%u bytes\n", (unsigned int) sizeof(struct ext3_inode_info));

+	printk(KERN_DEBUG "sizeof(buffer_head)=%u bytes\n", (unsigned int) sizeof(struct buffer_head));

+	printk(KERN_DEBUG "sizeof(skbuff)=%u bytes\n", (unsigned int) sizeof(struct sk_buff));

+	printk(KERN_DEBUG "sizeof(task_struct)=%u bytes\n", (unsigned int) sizeof(struct task_struct));

 }

 #endif