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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379b49fecsm7650432b3a.15.2026.01.30.01.37.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jan 2026 01:37:34 -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 1/2] mm/kmemleak: Remove unreachable return statement in scan_should_stop() Date: Fri, 30 Jan 2026 17:37:28 +0800 Message-ID: <20260130093729.2045858-2-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-ORIG-GUID: CvmDFar67wrddDOjjpggLpvrTb87Vz-4 X-Authority-Analysis: v=2.4 cv=EvjfbCcA c=1 sm=1 tr=0 ts=697c7be0 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=M4yuILNbWragLVBGtl0A:9 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-GUID: CvmDFar67wrddDOjjpggLpvrTb87Vz-4 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTMwMDA3NSBTYWx0ZWRfX8dvJIYPxtwCw 3O9+31P8xGPaGW3ep6VksU8jLCVWuaskeat3ob7llWhk1JmJDlxuU6Zk8b6oFVXW+tWUHFC5ngF P23WcKxJqLWaObIgGcUi/5O9nuWKwnuFTyKQKAf8JpQsU7t6sEHx5Ia6KZ5p4q0j/1EQQje6c2d 1tu+Woat6LlW6hONwLa+Re/ElXdmD/orh3Kp2QMl20W9ugPExXXPR8m9TU93t3wkqtL8mFkyOuz gdB/c8pdrKnLbvx4N3RiJraLFYR+W5O+jl6FqXS9UGyae01QGPdOLaq21VH4L4xoGMtM5YkidmH 0b1Fa67Sk8Oihfl6OTqE3K/XkGXwgGFBCuSu+FVtNe1u1wPfzRL/gOOKbjLNJjWQQ3D0jWqTYWs qlCFPSgwurG8e+5OpGDeK9xv/lc88HQ5nYOqiIh/HvSX7hmkkcwawPMUi1DdbfXkUKlIBXvTTov QtZmdQya6K/12LBcuXw== 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 clxscore=1015 spamscore=0 priorityscore=1501 bulkscore=0 suspectscore=0 adultscore=0 malwarescore=0 impostorscore=0 lowpriorityscore=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" Remove unreachable "return 0;" statement as all execution paths return before reaching it. No functional change. Signed-off-by: Zhongqiu Han Acked-by: Catalin Marinas --- mm/kmemleak.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index fe33f2edfe07..fb0022f34393 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1509,10 +1509,8 @@ static int scan_should_stop(void) */ if (current->mm) return signal_pending(current); - else - return kthread_should_stop(); =20 - return 0; + return kthread_should_stop(); } =20 /* --=20 2.43.0 From nobody Sun Feb 8 19:35:43 2026 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5A2EC3542FE for ; Fri, 30 Jan 2026 09:37:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769765864; cv=none; b=U9xa2HUuheiRMsHK6Oe7eCssbg4lJnx53JmCjiqBQUkbCkpDJH2O4TCuZig1yeC1q0XJ28UMXy5CrjUNf+V4WVyKEyCFECLcMf6+CF0IFV75Q3bFE+koZbXG8tj+97rQnGStshDVM5W6IScDjXMNtgw4w0KtfSIqnKKT4Q4lxuA= ARC-Message-Signature: i=1; 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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