Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull stacktrace fix from Thomas Gleixner:
 "Fix yet another instance of kernel thread check which ignores that
  kernel threads can call use_mm()"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  stacktrace: Use PF_KTHREAD to check for kernel threads