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mm: multi-gen LRU: remove NULL checks on NODE_DATA() 

NODE_DATA() is preallocated for all possible nodes after commit
09f49dca57 ("mm: handle uninitialized numa nodes gracefully").  Checking
its return value against NULL is now unnecessary.

Link: https://lkml.kernel.org/r/20221116013808.3995280-2-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yu Zhao 2022-11-15 18:38:08 -07:00 committed by Andrew Morton
parent f347454d03
commit 931b6a8b36
1 changed files with 2 additions and 11 deletions
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13
mm/vmscan.c
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@ -3166,7 +3166,7 @@ static struct lruvec *get_lruvec(struct mem_cgroup *memcg, int nid)
if (memcg) {
struct lruvec *lruvec = &memcg->nodeinfo[nid]->lruvec;
/* for hotadd_new_pgdat() */
/* see the comment in mem_cgroup_lruvec() */
if (!lruvec->pgdat)
lruvec->pgdat = pgdat;
@ -3175,7 +3175,7 @@ static struct lruvec *get_lruvec(struct mem_cgroup *memcg, int nid)
#endif
VM_WARN_ON_ONCE(!mem_cgroup_disabled());
return pgdat ? &pgdat->__lruvec : NULL;
return &pgdat->__lruvec;
}
static int get_swappiness(struct lruvec *lruvec, struct scan_control *sc)
@ -3239,9 +3239,6 @@ void lru_gen_add_mm(struct mm_struct *mm)
for_each_node_state(nid, N_MEMORY) {
struct lruvec *lruvec = get_lruvec(memcg, nid);
if (!lruvec)
continue;
/* the first addition since the last iteration */
if (lruvec->mm_state.tail == &mm_list->fifo)
lruvec->mm_state.tail = &mm->lru_gen.list;
@ -3271,9 +3268,6 @@ void lru_gen_del_mm(struct mm_struct *mm)
for_each_node(nid) {
struct lruvec *lruvec = get_lruvec(memcg, nid);
if (!lruvec)
continue;
/* where the last iteration ended (exclusive) */
if (lruvec->mm_state.tail == &mm->lru_gen.list)
lruvec->mm_state.tail = lruvec->mm_state.tail->next;
@ -5348,9 +5342,6 @@ static void lru_gen_change_state(bool enabled)
for_each_node(nid) {
struct lruvec *lruvec = get_lruvec(memcg, nid);
if (!lruvec)
continue;
spin_lock_irq(&lruvec->lru_lock);
VM_WARN_ON_ONCE(!seq_is_valid(lruvec));