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where does vmlist be initiated?

hi,
  i found this structure is defined in mm/vmalloc.c :
  "static struct vm_struct * vmlist = NULL;"

  it appears that vmlist be initiated as null. but in function
get_vm_area(), which is called by kmalloc(), it doesn't work if vmlist is
null. so i think vmlist must be initiated somewhere else. but where? thx

regards,
Wang

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