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Thu, 02 Apr 2026 00:34:22 +0000 (GMT) Received: from pps.filterd (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 631NwbJJ025980; Thu, 2 Apr 2026 00:34:21 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 4d65ec222p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2026 00:34:21 +0000 Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 6320YJ7e001596; Thu, 2 Apr 2026 00:34:20 GMT Received: from localhost.localdomain (ca-dev60.us.oracle.com [10.129.136.27]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 4d65ec221n-2; Thu, 02 Apr 2026 00:34:20 +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 1/2] mm: fix mmap errno value when MAP_DROPPABLE is not supported Date: Wed, 1 Apr 2026 17:34:16 -0700 Message-ID: <20260402003417.438037-2-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260402003417.438037-1-anthony.yznaga@oracle.com> References: <20260402003417.438037-1-anthony.yznaga@oracle.com> 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=2026-04-01_05,2026-04-01_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 bulkscore=0 spamscore=0 malwarescore=0 mlxlogscore=999 phishscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2603050001 definitions=main-2604020003 X-Proofpoint-GUID: 6Z-8Pd5rBCVrAJq5qnKIDBNWX2gY9RRO X-Authority-Analysis: v=2.4 cv=G7cR0tk5 c=1 sm=1 tr=0 ts=69cdb98e b=1 cx=c_pps a=WeWmnZmh0fydH62SvGsd2A==:117 a=WeWmnZmh0fydH62SvGsd2A==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=EIcjfB9IiI4px24ztqRk:22 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=8mUEbX9rbSpP1ZQJX6cA:9 a=ZXulRonScM0A:10 X-Proofpoint-ORIG-GUID: 6Z-8Pd5rBCVrAJq5qnKIDBNWX2gY9RRO X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDAwMyBTYWx0ZWRfXweGrWjXFhoe0 ak8nteaYbA7rH44XhsjFSL3Vnm3ocduDOalfdsxapBJpsRioIrjg4wwkgS3ohRc0ulV393oajvf 1HR96MjGTyrDxBVCqGRRuhCddYCrlX7Pav1Z3Y/f4G1MOuMLGmQOEbN5jAz3pnvyF3+6bErJ+ZD dAlGb7nacHB1sNJRq8fm44Cr0WutxsklpF7d1q9hB2Ch2j9kjTPhE1U6WAiSYMbk2fSKvHMMPe1 315ekbd6rQNuhoHyXL1ztSlbI+9DMHlpOH1lOM0XNxlbNSy5gB82Q/Jns3KG9qivsmnX6XiQojb Npm3yPaQI8zwQxPFyGk/NXFS5V60knYVOTHILi8Gfo2n9VjSGE8fLEJTfLCZroUSFAeqhm+kuGh WBBZFfcuKzFEggR2yrLH3DmUp1IJHnJBzhdbSxkKp8zhJerK3nIRBGaExTYuLWT0lt+UTMBskdt a8wzKU3642+VqeUcjgA== X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 5AFC21C000D X-Stat-Signature: tg816hmb7gg35j3b8nfh9m3nha1xzgn4 X-HE-Tag: 1775090067-597049 X-HE-Meta: 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 ERzkXwYV CErj2crl2StqLmuALF7Wpuk22MfQfDy9MTNh4LaulePOgymuK1wHoEEWvgk1/mbWnbv/fv6cMLGZQ+pEw7S9LIP+YV1YzH6+sesWfF73263udKglTrUi6IuQM+chCxq3Gaaaxo2C2CZ62ETpmpoz5JuB0zr0W1GV0Yv3AnXX+ranwmGrVTIBYjFF4izOUYm+KtjLteTXDoGH8IWFVyd+yK4bAd0odf9l+zQI6AYbKm6z0lxH9Pn6lhl7vyQR+JqA+m4HQYr1AUK+kbntcDCqEjO4x1pwPgAdOdr2ZR3CMi7w3+iUCkX4IC7LD/VKTi1MDgNKdFo9i0PP4/DA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 affect. 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