There is a minor problem in function start_kernel.  start_kernel will
enable interrupt after calling profile_init.  However, before that,
function time_init on IA64 platform could enable interrupt.  See this call
sequence:

  start_kernel
  ->time_init
    ->ia64_init_itm
      ->register_time_interpolator
        ->write_seqlock_irq.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Yao Jun <junx.yao@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>