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diff --git a/init/main.c b/init/main.c
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index 7449819..98cfaae 100644
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--- a/init/main.c
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+++ b/init/main.c
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@@ -369,6 +369,10 @@ static void __init setup_nr_cpu_ids(void)
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 	nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
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 }
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+#include <linux/ext3_fs_i.h>
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+#include <linux/skbuff.h>
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+#include <linux/sched.h>
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+
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 /* Called by boot processor to activate the rest. */
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 static void __init smp_init(void)
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 {
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@@ -391,6 +395,15 @@ static void __init smp_init(void)
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 	/* Any cleanup work */
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 	printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
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 	smp_cpus_done(setup_max_cpus);
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+
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+	printk(KERN_DEBUG "sizeof(vma)=%u bytes\n", (unsigned int) sizeof(struct vm_area_struct));
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+	printk(KERN_DEBUG "sizeof(page)=%u bytes\n", (unsigned int) sizeof(struct page));
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+	printk(KERN_DEBUG "sizeof(inode)=%u bytes\n", (unsigned int) sizeof(struct inode));
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+	printk(KERN_DEBUG "sizeof(dentry)=%u bytes\n", (unsigned int) sizeof(struct dentry));
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+	printk(KERN_DEBUG "sizeof(ext3inode)=%u bytes\n", (unsigned int) sizeof(struct ext3_inode_info));
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+	printk(KERN_DEBUG "sizeof(buffer_head)=%u bytes\n", (unsigned int) sizeof(struct buffer_head));
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+	printk(KERN_DEBUG "sizeof(skbuff)=%u bytes\n", (unsigned int) sizeof(struct sk_buff));
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+	printk(KERN_DEBUG "sizeof(task_struct)=%u bytes\n", (unsigned int) sizeof(struct task_struct));
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 }
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 #endif