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Tue, 11 Nov 2025 20:26:21 +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 5ABJ1VET039952; Tue, 11 Nov 2025 20:26:20 GMT Received: from brm-x62-16.us.oracle.com (brm-x62-16.us.oracle.com [10.80.150.37]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 4a9va9wdu3-1; Tue, 11 Nov 2025 20:26:20 +0000 From: Jane Chu To: gregkh@linuxfoundation.org, tj@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] fs/kernfs: raise sb->maxbytes to MAX_LFS_FILESIZE Date: Tue, 11 Nov 2025 13:26:06 -0700 Message-ID: <20251111202606.1505437-1-jane.chu@oracle.com> X-Mailer: git-send-email 2.43.5 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-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-11_04,2025-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 phishscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2510240000 definitions=main-2511110166 X-Authority-Analysis: v=2.4 cv=BYrVE7t2 c=1 sm=1 tr=0 ts=69139bed b=1 cx=c_pps a=WeWmnZmh0fydH62SvGsd2A==:117 a=WeWmnZmh0fydH62SvGsd2A==:17 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=XZXHcWFAyepS9mc2pJsA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTExMDE1MiBTYWx0ZWRfXwiwcz0oRCjCB 50uEUy/4rKC4dPFYA6x2iOoT1fdOHZ8vhka8ihoijU2Jcat/IQ6/G0/nxdV4Tf02+3JzQDd0Ezg 2AoDCaq3tPEVVyAo3Qm0IV/NVXBlftbOT4DHkUjA8djzZzeY2Mpsn8WkPeG2TJ6RzHoQnDMAOGP YFjO3qR5gVecuhibuCElQzVaK5U9UtzTnQiuGhqrcMKWf2dbLK666i6d4g8VOBHAL5NswNmOg46 hTpnFnZMfCAKz5L7UYC2JIru3ZUPx/bbTLZueM/qPB4BdaOqvXZdf3YlHLsvUdVuT8WX2ypWV0g 5NX3aNd+5MOgK06iooWkehLMDlNN7y+m/zti1OHSsWkBY3Nnd6LGiw7gB+jr2mMtfME8T9MiI7L ZVjmi/XjjUV9aAkl+6fmqdPO0KSiOA== X-Proofpoint-GUID: lvI11MFomyWjyqLxxpzot5QeXYKdMiaJ X-Proofpoint-ORIG-GUID: lvI11MFomyWjyqLxxpzot5QeXYKdMiaJ Content-Type: text/plain; charset="utf-8" On an ARM64 A1 system, it's possible to have physical memory span up to the 64T boundary, like below $ lsmem -b -r -n -o range,size 0x0000000080000000-0x00000000bfffffff 1073741824 0x0000080000000000-0x000008007fffffff 2147483648 0x00000800c0000000-0x0000087fffffffff 546534588416 0x0000400000000000-0x00004000bfffffff 3221225472 0x0000400100000000-0x0000407fffffffff 545460846592 So it's time to extend /sys/kernel/mm/page_idle/bitmap to be able to account for >2G number of pages, by raising the kernfs file size limit. Signed-off-by: Jane Chu --- fs/kernfs/mount.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index 76eaf64b9d9e..3ac52e141766 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -298,6 +298,7 @@ static int kernfs_fill_super(struct super_block *sb, st= ruct kernfs_fs_context *k if (info->root->flags & KERNFS_ROOT_SUPPORT_EXPORTOP) sb->s_export_op =3D &kernfs_export_ops; sb->s_time_gran =3D 1; + sb->s_maxbytes =3D MAX_LFS_FILESIZE; =20 /* sysfs dentries and inodes don't require IO to create */ sb->s_shrink->seeks =3D 0; --=20 2.43.5