From: SJ Park <sj@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: SJ Park <sj@kernel.org>,
damon@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCH 04/12] mm/damon/core: validate number of probes in valid_probe_params()
Date: Tue, 1 Sep 2026 22:47:37 -0700 [thread overview]
Message-ID: <20260902054747.99370-5-sj@kernel.org> (raw)
In-Reply-To: <20260902054747.99370-1-sj@kernel.org>
Each DAMON context is allowed to have only up to DAMON_MAX_PROBES
probes. The central place for validating DAMON probe parameters,
damon_valid_probe_params(), is not validating the upper limit, though.
Do the validation.
Signed-off-by: SJ Park <sj@kernel.org>
---
mm/damon/core.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 4d28eb033fc4a..c010f686d033e 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1420,6 +1420,13 @@ static bool damon_valid_probe_params(struct damon_ctx *ctx)
unsigned char max_probe_hits;
struct damon_probe *probe;
unsigned int wsum, wsum_to_add;
+ int nr_probes;
+
+ nr_probes = 0;
+ damon_for_each_probe(probe, ctx)
+ nr_probes++;
+ if (nr_probes > DAMON_MAX_PROBES)
+ return false;
if (!damon_has_probe_weights(ctx))
return true;
--
2.47.3
next prev parent reply other threads:[~2026-09-02 5:47 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 5:47 [PATCH 00/12] mm/damon: cleanup code, add test cases, and update guidances in docs SJ Park
2026-09-02 5:47 ` [PATCH 01/12] mm/damon/core: use damon_nr_samples_per_aggr() for max merge threshold SJ Park
2026-09-03 2:00 ` Kunwu Chan
2026-09-02 5:47 ` [PATCH 02/12] mm/damon/core: remove debug messages SJ Park
2026-09-02 6:14 ` SJ Park
2026-09-02 5:47 ` [PATCH 03/12] mm/damon/vaddr: remove a debug message SJ Park
2026-09-03 2:24 ` Kunwu Chan
2026-09-02 5:47 ` SJ Park [this message]
2026-09-02 15:32 ` [PATCH 04/12] mm/damon/core: validate number of probes in valid_probe_params() Kunwu Chan
2026-09-02 5:47 ` [PATCH 05/12] mm/damon/sysfs: remove probes number validation SJ Park
2026-09-02 14:07 ` Kunwu Chan
2026-09-02 14:37 ` SJ Park
2026-09-02 15:33 ` Kunwu Chan
2026-09-02 5:47 ` [PATCH 06/12] mm/damon/tests/core-kunit: extend set_regions() test for error case SJ Park
2026-09-02 5:47 ` [PATCH 07/12] mm/damon/tests/core-kunit: test <=0 size damon_set_regions() inputs SJ Park
2026-09-02 5:47 ` [PATCH 08/12] mm/damon/tests/core-kunit: test overlapping ranges for set_regions() SJ Park
2026-09-03 3:04 ` Kunwu Chan
2026-09-02 5:47 ` [PATCH 09/12] mm/damon/tests/core-kunit: test damon_nr_samples_per_aggr() SJ Park
2026-09-02 15:08 ` Kunwu Chan
2026-09-02 15:19 ` SJ Park
2026-09-02 15:49 ` Kunwu Chan
2026-09-03 0:22 ` SJ Park
2026-09-02 5:47 ` [PATCH 10/12] selftests/damon/sysfs.sh: test hugepage_mem_bp quota goal SJ Park
2026-09-03 3:06 ` Kunwu Chan
2026-09-02 5:47 ` [PATCH 11/12] Docs/mm/damon/maintainer-profile: update AI review for Sashiko replies SJ Park
2026-09-02 5:47 ` [PATCH 12/12] Docs/ABI/damon: recommend subsystem doc instead of admin-guide SJ Park
2026-09-03 3:09 ` Kunwu Chan
2026-09-02 6:16 ` [PATCH 00/12] mm/damon: cleanup code, add test cases, and update guidances in docs SJ Park
2026-09-02 22:42 ` Andrew Morton
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