[PATCH 0/7] Intro: convert lockd to kthread and fix use-after-free (try #3)

This is the third patchset to fix the use-after-free problem in lockd,
and to convert lockd to use the kthread API instead of kernel_thread.
The main change from the last patchset is the elimination of the
svc_create_kthread helper function, and having lockd_up call kthread_run
directly. I've also made some changes to the function prototype for
the lockd function to eliminate the need for casting the function
pointer.

Tested against the reproducer I have for the main issue (detailed in
patch #7). As always, comments and suggestions are appreciated.

Signed-off-by: Jeff Layton <[email protected]>

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