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Commit 2b38f0db authored by SeongJae Park's avatar SeongJae Park Committed by Greg Kroah-Hartman
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mm/damon/lru_sort: avoid divide-by-zero in hot threshold calculation

commit 44063f12 upstream.

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: 40e983cc ("mm/damon: introduce DAMON-based LRU-lists Sorting")
Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Reported-by: default avatarJakub Acs <acsjakub@amazon.de>
Cc: <stable@vger.kernel.org>	[6.0+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cf264109
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