memcg: remove impossible conditional when committing

No callsite ever passes a NULL pointer for a struct mem_cgroup * to the committing function. There is no need to check for it.

---
 mm/memcontrol.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

index 031ff07..a145c9e 100644
@@ -2092,10 +2092,6 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
 {
 	int nr_pages = page_size >> PAGE_SHIFT;
 
-	/* try_charge() can return NULL to *memcg, taking care of it. */
-	if (!mem)
-		return;
-
 	lock_page_cgroup(pc);
 	if (unlikely(PageCgroupUsed(pc))) {
 		unlock_page_cgroup(pc);

1.7.4

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But, could you add VM_BUG_ON(!mem) here ?

Thanks,
-Kame

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