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authorSeongJae Park <sj@kernel.org>2023-10-19 19:49:23 +0000
committerAndrew Morton <akpm@linux-foundation.org>2023-10-25 16:47:15 -0700
commit44063f125af4bb4efd1d500d8091fa33a98af325 (patch)
tree20c83e3ff9e7e696515145b58ac425be20c46958 /mm/damon/lru_sort.c
parent3bafc47d3c4a2fc4d3b382aeb3c087f8fc84d9fd (diff)
mm/damon/lru_sort: avoid divide-by-zero in hot threshold calculation
When calculating the hotness threshold for lru_prio scheme of DAMON_LRU_SORT, the module divides some values by the maximum nr_accesses. However, due to the type of the related variables, simple division-based calculation of the divisor can return zero. As a result, divide-by-zero is possible. Fix it by using damon_max_nr_accesses(), which handles the case. Link: https://lkml.kernel.org/r/20231019194924.100347-5-sj@kernel.org Fixes: 40e983cca927 ("mm/damon: introduce DAMON-based LRU-lists Sorting") Signed-off-by: SeongJae Park <sj@kernel.org> Reported-by: Jakub Acs <acsjakub@amazon.de> Cc: <stable@vger.kernel.org> [6.0+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/damon/lru_sort.c')
-rw-r--r--mm/damon/lru_sort.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index 3ecdcc029443..f2e5f9431892 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -195,9 +195,7 @@ static int damon_lru_sort_apply_parameters(void)
if (err)
return err;
- /* aggr_interval / sample_interval is the maximum nr_accesses */
- hot_thres = damon_lru_sort_mon_attrs.aggr_interval /
- damon_lru_sort_mon_attrs.sample_interval *
+ hot_thres = damon_max_nr_accesses(&damon_lru_sort_mon_attrs) *
hot_thres_access_freq / 1000;
scheme = damon_lru_sort_new_hot_scheme(hot_thres);
if (!scheme)