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Thu, 16 Apr 2026 03:39:45 +0000 (GMT) Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.7/8.18.1.7) with ESMTP id 63G3dXDm022548; Thu, 16 Apr 2026 03:39:44 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 4dh7npq7mb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Apr 2026 03:39:44 +0000 (GMT) Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.1.12) with ESMTP id 63G3dgit023193; Thu, 16 Apr 2026 03:39:43 GMT Received: from localhost.localdomain (ca-dev60.us.oracle.com [10.129.136.27]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 4dh7npq7k1-2; Thu, 16 Apr 2026 03:39:43 +0000 (GMT) From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com, shuah@kernel.org Subject: [PATCH v4 1/3] mm: fix mmap errno value when MAP_DROPPABLE is not supported Date: Wed, 15 Apr 2026 20:39:37 -0700 Message-ID: <20260416033939.49981-2-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260416033939.49981-1-anthony.yznaga@oracle.com> References: <20260416033939.49981-1-anthony.yznaga@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-16_01,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=991 bulkscore=0 mlxscore=0 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2604070000 definitions=main-2604160031 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE2MDAzMSBTYWx0ZWRfXweU741C/7Ah1 DOj0Fk5yXEwNdLh7itYMd2mOGH8YuqklOnzqdmtYx4bTXjZzsmc+QeLBOVHfUdGpEbXuyXd5D0e HmoLx8qZmI8b+FOVTP2fyV1CzYJhzr7bqEsqfcecf9tfOvwv4UsGChhKgVKy6dEE4648NK9Jg2f 8WPRZpQuM51Gz9OefmRiF2Z2o0MK9QtxBbtzBP8IcWfha8WnjoBPCpaPtiNCZIfdDrFNxKBmIEW Y/q5MHwVq/ZSFr8fWBA3lm/HqUcwC8cMGyY1YU2IcVsPbhc2JNNFV/eYYeYFtWDTZkf5wueLdla 04ZE7A4DAHpNl289b25rWzyGHfKt90OoMVmq1cKCcKesWPTXR7hWmxkdf1Vup0NogGF08OCNkzH ZUsYl+ySjy/zodfwh+6at6+XAEySdrvceThnSVoElPrmho4xbtZCzVSoEZG1WWdhn28FLtLD7BB GvXLx0XCJ8ymUYadzDeAF1s/P5qBYUBjRfXKaKUQ= X-Authority-Analysis: v=2.4 cv=cbjiaHDM c=1 sm=1 tr=0 ts=69e05a01 b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=BqU2WV_vvsyTyxaotp0D:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=Dv_WXUeMNy8hEQbTb70A:9 cc=ntf awl=host:12291 X-Proofpoint-GUID: CsDO3YR0k8f9eD17oFOBMn50UdVXwONW X-Proofpoint-ORIG-GUID: CsDO3YR0k8f9eD17oFOBMn50UdVXwONW On configs where MAP_DROPPABLE is not supported (currently any 32-bit config except for PPC32), mmap fails with errno set to ENOTSUPP. However, ENOTSUPP is not a standard error value that userspace knows about. The acceptable userspace-visible errno to use is EOPNOTSUPP. checkpatch.pl has a warning to this effect. Fixes: 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily freeable mappings") Cc: Signed-off-by: Anthony Yznaga Acked-by: David Hildenbrand (Arm) Acked-by: Vlastimil Babka (SUSE) Reported-by: Mark Brown Reviewed-by: Pedro Falcato Reviewed-by: Lorenzo Stoakes (Oracle) --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index 5754d1c36462..2311ae7c2ff4 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -504,7 +504,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, break; case MAP_DROPPABLE: if (VM_DROPPABLE == VM_NONE) - return -ENOTSUPP; + return -EOPNOTSUPP; /* * A locked or stack area makes no sense to be droppable. * -- 2.47.3