SRU Justification

Impact: yama_ptracer_del can be called in softirq context causing
lockdep warnings

Patch Description: Use spin_lock_bh/spin_unlock_bh to protect list
manipulation against soft IRQ contexts.


** Patch added: "UBUNTU: SAUCE: fix yama_ptracer_del lockdep warning"
   
https://bugs.launchpad.net/ubuntu/+source/linux-ti-omap4/+bug/791019/+attachment/2219596/+files/0001-UBUNTU-SAUCE-fix-yama_ptracer_del-lockdep-warning.patch

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https://bugs.launchpad.net/bugs/791019

Title:
  yama_ptracer_del lockdep warning

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