x86: change kernel_physical_mapping_init() __init to __meminit

kernel_physical_mapping_init() could be called in memory hotplug path.

[ Impact: fix potential crash with memory hotplug ]
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
LKML-Reference: <20090612045752.GA827@sli10-desk.sh.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/mm/init_64.c

@@ -527,7 +527,7 @@ phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
 	return phys_pud_init(pud, addr, end, page_size_mask);
 }
 
-unsigned long __init
+unsigned long __meminit
 kernel_physical_mapping_init(unsigned long start,
 			     unsigned long end,
 			     unsigned long page_size_mask)