Hi all
I saw a stack trace while booting the 2.6.17-rc6-mm2 kernel. Which looks 
  like this

BUG: using smp_processor_id() in preemptible [00000001] code: init/1
caller is __handle_mm_fault+0x22/0x248
  [<c010334c>] show_trace+0x27/0x29
  [<c0103486>] dump_stack+0x26/0x28
  [<c02e4d6f>] debug_smp_processor_id+0x9f/0xb0
  [<c0157a98>] __handle_mm_fault+0x22/0x248
  [<c01140b2>] do_page_fault+0x17e/0x605
  [<c01030b9>] error_code+0x39/0x40
  [<c0198eef>] padzero+0x2c/0x37
  [<c0199ff5>] load_elf_binary+0x6e2/0xcfc
  [<c0174e14>] search_binary_handler+0x96/0x201
  [<c017510e>] do_execve+0x18f/0x243
  [<c010152b>] sys_execve+0x3c/0x81
  [<c04a9c93>] syscall_call+0x7/0xb

    Cause for the bug is a set of functions count_vm_event(),
     count_vm_events() and get_cpu_vm_events() calling smp_processor_id()
     in preemptible context without disabling irq's

So I developed patch for this problem,attaching the patch here