[DRAFT v3.4] - audit cmdline updates

[William Roberts]

Changes since last publish:
* Ran all patches through checkpatch, some elluded me.
* Changed cmdline copy/length API to reduce task_mm_get() mmput() calls

Still need to know:
* Any major objecttions to this still?
* My public API changes are in proc, is this the best spot for those?

As always, thanks.

[PATCH 1/4] audit: Allow auditing of proc/self/cmdline value
[PATCH 2/4] audit: Enable cacheing of cmdline in audit_context
[PATCH 3/4] audit: dont allocate whole pages
[PATCH 4/4] SQUASH audit: Change cmdline get API to reduce locking