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| author | SeongJae Park <sj@kernel.org> | 2023-10-19 19:49:22 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-25 16:47:15 -0700 |
| commit | 3bafc47d3c4a2fc4d3b382aeb3c087f8fc84d9fd (patch) | |
| tree | ca24b9c75176b8588462d1ceb65dbb290d058e3a /mm/io-mapping.c | |
| parent | d35963bfb05877455228ecec6b194f624489f96a (diff) | |
| download | linux-3bafc47d3c4a2fc4d3b382aeb3c087f8fc84d9fd.tar.gz linux-3bafc47d3c4a2fc4d3b382aeb3c087f8fc84d9fd.tar.bz2 linux-3bafc47d3c4a2fc4d3b382aeb3c087f8fc84d9fd.zip | |
mm/damon/ops-common: avoid divide-by-zero during region hotness calculation
When calculating the hotness of each region for the under-quota regions
prioritization, DAMON 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/20231019194924.100347-4-sj@kernel.org
Fixes: 198f0f4c58b9 ("mm/damon/vaddr,paddr: support pageout prioritization")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Jakub Acs <acsjakub@amazon.de>
Cc: <stable@vger.kernel.org> [5.16+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/io-mapping.c')
0 files changed, 0 insertions, 0 deletions