freezer: rename thaw_process() to __thaw_task() and simplify the implementation

thaw_process() now has only internal users - system and cgroup
freezers.  Remove the unnecessary return value, rename, unexport and
collapse __thaw_process() into it.  This will help further updates to
the freezer code.

-v3: oom_kill grew a use of thaw_process() while this patch was
     pending.  Convert it to use __thaw_task() for now.  In the longer
     term, this should be handled by allowing tasks to die if killed
     even if it's frozen.

-v2: minor style update as suggested by Matt.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul Menage <menage@google.com>
Cc: Matt Helsley <matthltc@us.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 76f2c5ae908..3134ee2fb2e 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -328,7 +328,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
                  */
                 if (test_tsk_thread_flag(p, TIF_MEMDIE)) {
                         if (unlikely(frozen(p)))
-                                thaw_process(p);
+                                __thaw_task(p);
                         return ERR_PTR(-1UL);
                 }
                 if (!p->mm)