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mm/vmscan: sc->reclaim_idx must be a valid zone index

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lruvec_lru_size() is only used in get_scan_count(), so the only possible
zone_idx is sc->reclaim_idx.  Since sc->reclaim_idx is ensured to be a
valid zone idex, we can remove the extra check for zone iteration.

Link: https://lkml.kernel.org/r/20220317234624.23358-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2022-04-28 23:16:04 -07:00 committed by akpm
parent bc53008eea
commit 8b3a899abe
1 changed files with 2 additions and 2 deletions
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4
mm/vmscan.c
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@ -587,7 +587,7 @@ unsigned long zone_reclaimable_pages(struct zone *zone)
* lruvec_lru_size - Returns the number of pages on the given LRU list.
* @lruvec: lru vector
* @lru: lru to use
* @zone_idx: zones to consider (use MAX_NR_ZONES for the whole LRU list)
* @zone_idx: zones to consider (use MAX_NR_ZONES - 1 for the whole LRU list)
*/
static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
int zone_idx)
@ -595,7 +595,7 @@ static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
unsigned long size = 0;
int zid;
for (zid = 0; zid <= zone_idx && zid < MAX_NR_ZONES; zid++) {
for (zid = 0; zid <= zone_idx; zid++) {
struct zone *zone = &lruvec_pgdat(lruvec)->node_zones[zid];
if (!managed_zone(zone))