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b=DSA7olTXiK45kxIsJ2zUsJjlHNjfe2YGVGHkKrxOn+m2Kvh7MW1DpHKwaoHSDtrZx UYfI3QmQJroc/k3L6Qz1cnKLIbCYUBtrycelGNDd4aG8liuLE4VHj3oW4/KJOarXD2 ao2+jfYyKunNNtzGA85zeoLYGPZ2TxHsnUPNoS9dCEEwn7nqnLilHyzPQwomoUjGE2 EyFbHGRbw8NrUnBIWwB286euTRDLUdSG0vYBsWTruaFyVM6/i/1MkNYt/n2NsVIQwt N/1KVzLtVQIv7i/ZqAyCxaKNxKzrj6RR7dRsAq/EcdHil4PGX1zu2tdA9X0AkX1gb7 GqhYboUbPoS3w== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.1 8/8] mm/damon/sysfs: remove region size validation Date: Thu, 2 Jul 2026 14:05:50 -0700 Message-ID: <20260702210551.95167-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260702210551.95167-1-sj@kernel.org> References: <20260702210551.95167-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 1EBE818000F X-Stat-Signature: fgmj8q7aboc11unwxtjgbkecwp7npk9w X-HE-Tag: 1783026376-496958 X-HE-Meta: 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 hX5fyhRd j6htk+g7tdNR+uZ1zfu2q9jsBt8bpiXsLE0szdRcJVs7aVs+G7zusjshcTJYbeSCGj1XApx/gdx5Q4o5tAX/l/XlNyX0U+FMk/F1ZmeqgrwokS1VAC+FpzfHnbtTOxtfhOtr1BWVbKWcFgRSNfB3bggLPeZegVzrwmCjwHoX6Gda7uJTwYtepevQbVNTNmSOCr97Uf+LT2g+5DKXEiZicadNEaTSv+4F30NKC5fAH18Pq98o= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: DAMON_SYSFS validates user inputs for monitoring target regions to disallow negative size regions. DAMON core assumes only positive size regions, though. The validation is incomplete. Fortunately damon_set_regions(), which is eventually used by DAMON_SYSFS, does the complete validation. Remove the incomplete and unnecessary validation. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index e666dddf1feba..b65651498e0d1 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1987,9 +1987,6 @@ static int damon_sysfs_set_regions(struct damon_target *t, struct damon_sysfs_region *sys_region = sysfs_regions->regions_arr[i]; - if (sys_region->ar.start > sys_region->ar.end) - goto out; - ranges[i].start = sys_region->ar.start; ranges[i].end = sys_region->ar.end; if (i == 0) -- 2.47.3