1 files changed, 15 insertions, 33 deletions

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index f8eba9651c0c..c0c97aea837f 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -288,20 +288,13 @@ static enum oom_constraint constrained_alloc(struct zonelist *zonelist,
 }
 #endif
 
-enum oom_scan_t {
-	OOM_SCAN_OK,		/* scan thread and find its badness */
-	OOM_SCAN_CONTINUE,	/* do not consider thread for oom kill */
-	OOM_SCAN_ABORT,		/* abort the iteration and return */
-	OOM_SCAN_SELECT,	/* always select this thread first */
-};
-
-static enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
-		struct mem_cgroup *memcg, unsigned long totalpages,
-		const nodemask_t *nodemask, bool force_kill)
+enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
+		unsigned long totalpages, const nodemask_t *nodemask,
+		bool force_kill)
 {
 	if (task->exit_state)
 		return OOM_SCAN_CONTINUE;
-	if (oom_unkillable_task(task, memcg, nodemask))
+	if (oom_unkillable_task(task, NULL, nodemask))
 		return OOM_SCAN_CONTINUE;
 
 	/*
@@ -348,8 +341,8 @@ static enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
  * (not docbooked, we don't want this one cluttering up the manual)
  */
 static struct task_struct *select_bad_process(unsigned int *ppoints,
-		unsigned long totalpages, struct mem_cgroup *memcg,
-		const nodemask_t *nodemask, bool force_kill)
+		unsigned long totalpages, const nodemask_t *nodemask,
+		bool force_kill)
 {
 	struct task_struct *g, *p;
 	struct task_struct *chosen = NULL;
@@ -358,7 +351,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 	do_each_thread(g, p) {
 		unsigned int points;
 
-		switch (oom_scan_process_thread(p, memcg, totalpages, nodemask,
+		switch (oom_scan_process_thread(p, totalpages, nodemask,
 						force_kill)) {
 		case OOM_SCAN_SELECT:
 			chosen = p;
@@ -371,7 +364,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 		case OOM_SCAN_OK:
 			break;
 		};
-		points = oom_badness(p, memcg, nodemask, totalpages);
+		points = oom_badness(p, NULL, nodemask, totalpages);
 		if (points > chosen_points) {
 			chosen = p;
 			chosen_points = points;
@@ -443,10 +436,10 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
 }
 
 #define K(x) ((x) << (PAGE_SHIFT-10))
-static void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
-			     unsigned int points, unsigned long totalpages,
-			     struct mem_cgroup *memcg, nodemask_t *nodemask,
-			     const char *message)
+void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
+		      unsigned int points, unsigned long totalpages,
+		      struct mem_cgroup *memcg, nodemask_t *nodemask,
+		      const char *message)
 {
 	struct task_struct *victim = p;
 	struct task_struct *child;
@@ -564,10 +557,6 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
 void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
 			      int order)
 {
-	unsigned long limit;
-	unsigned int points = 0;
-	struct task_struct *p;
-
 	/*
 	 * If current has a pending SIGKILL, then automatically select it.  The
 	 * goal is to allow it to allocate so that it may quickly exit and free
@@ -579,13 +568,7 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
 	}
 
 	check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
-	limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT ? : 1;
-	read_lock(&tasklist_lock);
-	p = select_bad_process(&points, limit, memcg, NULL, false);
-	if (p && PTR_ERR(p) != -1UL)
-		oom_kill_process(p, gfp_mask, order, points, limit, memcg, NULL,
-				 "Memory cgroup out of memory");
-	read_unlock(&tasklist_lock);
+	__mem_cgroup_out_of_memory(memcg, gfp_mask, order);
 }
 #endif
 
@@ -710,7 +693,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
 	struct task_struct *p;
 	unsigned long totalpages;
 	unsigned long freed = 0;
-	unsigned int points;
+	unsigned int uninitialized_var(points);
 	enum oom_constraint constraint = CONSTRAINT_NONE;
 	int killed = 0;
 
@@ -748,8 +731,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
 		goto out;
 	}
 
-	p = select_bad_process(&points, totalpages, NULL, mpol_mask,
-			       force_kill);
+	p = select_bad_process(&points, totalpages, mpol_mask, force_kill);
 	/* Found nothing?!?! Either we hang forever, or we panic. */
 	if (!p) {
 		dump_header(NULL, gfp_mask, order, NULL, mpol_mask);