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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379b49fecsm7650432b3a.15.2026.01.30.01.37.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jan 2026 01:37:36 -0800 (PST) From: Zhongqiu Han To: catalin.marinas@arm.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zhongqiu.han@oss.qualcomm.com Subject: [PATCH 2/2] mm/kmemleak: Use PF_KTHREAD flag to detect kernel threads Date: Fri, 30 Jan 2026 17:37:29 +0800 Message-ID: <20260130093729.2045858-3-zhongqiu.han@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260130093729.2045858-1-zhongqiu.han@oss.qualcomm.com> References: <20260130093729.2045858-1-zhongqiu.han@oss.qualcomm.com> 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 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTMwMDA3NSBTYWx0ZWRfXw571Zjas7+80 4pMk+jQn4dIaz1pf17X01nTe6svCPL4Itp1wB1Vyx+aGEi+2pac8wZQ5wNgEaHZeqAUnpsTItMK iyOIA/iWyrsF3PDKEhvZJ7BaQsB8LGpTBgQydNxve9hZI8lKqR9zt/flAyo/OisyoYXnhtFTu30 KYnUu/bVwoDjtmHV5yHR4EwQMQRH+hQ1PNMFrWkEXuqw3L6Bjt3SbibUVGb9kqEFIgbds9Wjjr6 1qOI6TmG2zH2R6DZwBMdNld9euUJVkK1LrAgs6K/6pRYx6yIQKuw2hwURwb3Y18CfU3qnSJGAnu 1sCFdXDsi8wxm4cu87Vkzm+OLusn7CJM+N0IRiQpAoqmbD16yRbfzyP4Fsa7OLdv0qGOJyUGl2w /pW2eUbcNm6SvJTtxQWJZe1HIdZb5gfntrcm5y73wbql8M4uL9Ycfvcp652UPVSMlRLUSxiPUn8 Zc7Gt0Ne2nKbT1oO5cw== X-Proofpoint-ORIG-GUID: _gdpIyfbFM1ad3oxBLaazErQxDRRltjz X-Proofpoint-GUID: _gdpIyfbFM1ad3oxBLaazErQxDRRltjz X-Authority-Analysis: v=2.4 cv=UPLQ3Sfy c=1 sm=1 tr=0 ts=697c7be2 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=xdClYPew7k9-90-fC00A:9 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-29_03,2026-01-29_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 adultscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 spamscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601300075 Content-Type: text/plain; charset="utf-8" Replace the current->mm check with PF_KTHREAD flag for more reliable kernel thread detection in scan_should_stop(). The PF_KTHREAD flag is the standard way to identify kernel threads and is not affected by temporary mm borrowing via use_mm() (although kmemleak does not currently encounter such cases, this makes the code more robust). No functional change. Signed-off-by: Zhongqiu Han Acked-by: Catalin Marinas --- mm/kmemleak.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index fb0022f34393..eb2ffbaf2f7e 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1507,10 +1507,10 @@ static int scan_should_stop(void) * This function may be called from either process or kthread context, * hence the need to check for both stop conditions. */ - if (current->mm) - return signal_pending(current); + if (current->flags & PF_KTHREAD) + return kthread_should_stop(); =20 - return kthread_should_stop(); + return signal_pending(current); } =20 /* --=20 2.43.0