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Thu, 02 Apr 2026 23:59:40 +0000 (GMT) Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 632KoxLP008476; Thu, 2 Apr 2026 23:59:39 GMT Received: from pps.reinject (localhost [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 4d65ekna81-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2026 23:59:39 +0000 Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 632Nxb6P011992; Thu, 2 Apr 2026 23:59:39 GMT Received: from localhost.localdomain (ca-dev60.us.oracle.com [10.129.136.27]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 4d65ekna7a-2; Thu, 02 Apr 2026 23:59:39 +0000 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 v2 1/2] mm: fix mmap errno value when MAP_DROPPABLE is not supported Date: Thu, 2 Apr 2026 16:59:32 -0700 Message-ID: <20260402235933.10588-2-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260402235933.10588-1-anthony.yznaga@oracle.com> References: <20260402235933.10588-1-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=2026-04-02_04,2026-04-02_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 mlxscore=0 phishscore=0 adultscore=0 malwarescore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2603050001 definitions=main-2604020214 X-Authority-Analysis: v=2.4 cv=PqaergM3 c=1 sm=1 tr=0 ts=69cf02ec b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=3I1J8UUJPc9JN9BFgKH3:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=8mUEbX9rbSpP1ZQJX6cA:9 a=ZXulRonScM0A:10 cc=ntf awl=host:12291 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDIxNCBTYWx0ZWRfX1kv9f3Z8G2om XCRJV0DHZNDXtZnG6Jr5JZNsATUwgraezaCLHdeZEZ6VH4SnY6iKtKGpMr8wDuk2fCWS25MikwV lkkEDmLqvtrpM7RzVXctZZav5MsPkuT9jr0f9H+JkxKsQlJRVoRVg8ZUDyhHQIuXw0Iw6RnxbFR BzVj0IYhwSkDTnMvDdCHzHX990m/bvgrB1avC4R5gBqfsOwuQce/ROe0i/r6KarWIuG1vkrOv4E M/UTcNbKe4ZxcwPy1Ry6fm4vwT1rs9hq/x2k3g6EddJBLV2OqXGP5eVEM1ASdpJLqlCkPOmkE3E IGrcqkLTUDTJjmLF7epk/tI7kfmH4xVWlSgpV6TbzNLTcFNJcRtHLWbw9kPyFmK5XBoJ9ogw/HE fjXhSgksnVoS/ZYPsGuzaaCQtGA/D6mInPF5QLjYVH7nGOuR3wtqafWQwnJZFW6XuFnZsNPLPjJ 1WW9ucwyFZxhY4GxholNjm4ds1mbgbp8o0j1nGIM= X-Proofpoint-ORIG-GUID: 3JUIj9xm-8FVoRtXmzIk0pKWijSksMh8 X-Proofpoint-GUID: 3JUIj9xm-8FVoRtXmzIk0pKWijSksMh8 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 --- 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