From nobody Sun Feb 8 06:56:23 2026 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 105C11EFFBD for ; Tue, 25 Mar 2025 19:49:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.180 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742932171; cv=none; b=DCsVwaVXxZ2/i45wpAt/kQ6MScvTg6vP1ODK1kePG9ub3nofl6OQbwLBO9102mdr9b1tokrdXaZJjHwogWNveEKcZEYwpFcLooghk65KaFg/P1yr7gVtsfcipqR4DuBZUqBYkIoNqhWXNAv8HLSjHp8UIEFozrRrUB8P/CxR1iQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742932171; c=relaxed/simple; bh=n9X/LHaKjTAlTu3Dq9YOdSywp/+I73X0hcr7Z9IQjI0=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=eJANUlOtL1wnZM4JU6iB/qL3nlQuJgNBOUBite5Q9XK3IHM4WJPAzS2gYkGEOUT88sy2/MQqUn109aEfY8X/HIozV5U5BXiVp6IcGKuzLoPT2HjWl/mft8hbj5LTmo7OUldQjTgO+cZCWLAi+u+2BZYgBQSl4pgS68iZMv4F0BE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Aa6yIzBq; arc=none smtp.client-ip=209.85.214.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Aa6yIzBq" Received: by mail-pl1-f180.google.com with SMTP id d9443c01a7336-22401f4d35aso127549175ad.2 for ; Tue, 25 Mar 2025 12:49:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1742932169; x=1743536969; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=34tbpW8BH2aqAy4+jZFikzk4k9oyhAq1g+2Ui0jyM1w=; b=Aa6yIzBqz9wf9HVoAl5/ToRcH7Q+6Rumlj/uRsOHlDH4M7wz1EGeQtq7DOrXnrUcDs NChgnMfFQGeqjNyXoXYwnj2QbV53aJRjpRp3sM0wDAiMTPV8W3smR4nWMy+B8YmdyMzo Kyu3lx10Pn3vk09CVmahH4QHb5Lai5whKWUI41568cAP34jlcZAUw51JWggftTtEB2+H J6HwHpCQkdyFrjcFNaAsfh70wFnZVmkL82MgbBr7Xc0QwPafNRU5YWquoSoZqzZOy+7q jsUTwei8+0XJzGKLSSwS6ppJ7ULWWHbXqUW89b3AoZhT9GC09wJBHqWHjO6RIKScpVGz SsuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742932169; x=1743536969; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=34tbpW8BH2aqAy4+jZFikzk4k9oyhAq1g+2Ui0jyM1w=; b=NF1B0cBQ3C+OpaJsuag4aYgGeQ1XzW1kaBxSbgjIApt49hKDwInMelJi9uk1L7BBUB qw3N8xPVTZg9jmG0KD9+XH1AEyaC7eX3VDTuRv0DS8OpvuyBwipINxAfjYHzo67Qnr+0 vQCoX4cz4SsrY0bVI/U0QeqddVcsK3Z7Q0sI632LzN0SuW4U7nxeLjuKFCOLCby9R+9r 2+2o5QSqT4dbg4gAnUBsbnEWPkjA9Boyx/Ki+iw91Co3F8II7XRcSOBJOtqwkOa5H+vR /rYQm1cjkWWBgW44CIHhkK60YFw1A8WB0NfMCIo6TtqusfaAQsYhX7UciXi0OdhULjOR lIsA== X-Forwarded-Encrypted: i=1; AJvYcCW8Z9jXWAAfAJ2zfqYYtHRdLmwwqOq9fo+liYx0SwLCwpX+L+3IJ5JZcZlEWjFqA2r1dDGzeOhzUfPVRGU=@vger.kernel.org X-Gm-Message-State: AOJu0Yzlwh5dyVeNa9dtnCZeojs752gk0a/vrtnRyobU7k7iCV3NxDH4 mjfqQ2Ty6OZ8JDLZhtWt5xdMfL26/SNF4XEk6nXqVjmaOqSQj70y X-Gm-Gg: ASbGnctVQ0mm8SixT5+/xSbcStxaqunkl+my4oMjyCpY+jVycq2NSgKopoVz30+3tEo fALnYH3st9Rv9Uc7hKqABUIvyRYh8e1i5faiRYrhvfM7loHg4QmtVGB02AsXMZ6/gFaKZZi1vC8 5BEkbXHhpUBP/+qCLe0wzwXkSJ7Lt2C2fSZQQecG4LR5z6qJK9Ctrfn+TqvRr8r3NnelpYf44e3 6DXLNB2qB9WeXsqD8fN9qyU+iNwWHmbi3LMCuZnZ20Re0RdBRVMb2HysJM4uRKNvY8DwIDedqmm V2n1CpWJ8yIbDtg5dJxE86GaXxciq8HBvNMIRmA1EWhiQwZPgTsp/60EH6QutaHbJdoxIy6z9yv S32U= X-Google-Smtp-Source: AGHT+IHuD4gU2NB/Cm9OJi4UNA2DHkgt3xOtYAV0HSQIHALTmHNx1aZFVH90L3KBo1cExPRliedHOQ== X-Received: by 2002:a05:6a00:234c:b0:736:4e67:d631 with SMTP id d2e1a72fcca58-73905a50170mr24970197b3a.23.1742932169094; Tue, 25 Mar 2025 12:49:29 -0700 (PDT) Received: from purva-IdeaPad-Gaming-3-15IHU6.. ([2409:4080:119f:3ad6:66e:eb88:9ca5:b5e6]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73905fab592sm10992435b3a.19.2025.03.25.12.49.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Mar 2025 12:49:28 -0700 (PDT) From: Purva Yeshi To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Purva Yeshi Subject: [PATCH] mm/vmscan: Initialize dirty to prevent uninitialized use Date: Wed, 26 Mar 2025 01:19:20 +0530 Message-Id: <20250325194920.53307-1-purvayeshi550@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Fix Smatch-detected error: mm/vmscan.c:3509 walk_pte_range() error: uninitialized symbol 'dirty'. mm/vmscan.c:3522 walk_pte_range() error: uninitialized symbol 'dirty'. mm/vmscan.c:3600 walk_pmd_range_locked() error: uninitialized symbol 'dirty= '. mm/vmscan.c:3614 walk_pmd_range_locked() error: uninitialized symbol 'dirty= '. mm/vmscan.c:4220 lru_gen_look_around() error: uninitialized symbol 'dirty'. mm/vmscan.c:4232 lru_gen_look_around() error: uninitialized symbol 'dirty'. Smatch reports 'dirty' as uninitialized, leading to potential undefined behavior. Explicitly initialize dirty to 0 in walk_pte_range(), walk_pmd_range_locked(), and lru_gen_look_around() in mm/vmscan.c to fix Smatch error. Signed-off-by: Purva Yeshi --- mm/vmscan.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index c767d71c43d7..39c49fcd960c 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3456,7 +3456,7 @@ static bool walk_pte_range(pmd_t *pmd, unsigned long = start, unsigned long end, struct mm_walk *args) { int i; - bool dirty; + bool dirty =3D 0; pte_t *pte; spinlock_t *ptl; unsigned long addr; @@ -3535,7 +3535,7 @@ static void walk_pmd_range_locked(pud_t *pud, unsigne= d long addr, struct vm_area struct mm_walk *args, unsigned long *bitmap, unsigned long *first) { int i; - bool dirty; + bool dirty =3D 0; pmd_t *pmd; spinlock_t *ptl; struct folio *last =3D NULL; @@ -4147,7 +4147,7 @@ static void lru_gen_age_node(struct pglist_data *pgda= t, struct scan_control *sc) bool lru_gen_look_around(struct page_vma_mapped_walk *pvmw) { int i; - bool dirty; + bool dirty =3D 0; unsigned long start; unsigned long end; struct lru_gen_mm_walk *walk; --=20 2.34.1