From 2467f9928c9824e52718f977009ed3a0cee83dc5 Mon Sep 17 00:00:00 2001 From: Jane Chu Date: Tue, 11 Nov 2025 13:26:06 -0700 Subject: [PATCH] fs/kernfs: raise sb->maxbytes to MAX_LFS_FILESIZE 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 Link: https://patch.msgid.link/20251111202606.1505437-1-jane.chu@oracle.com Signed-off-by: Greg Kroah-Hartman --- 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, struct kernfs_fs_context *k if (info->root->flags & KERNFS_ROOT_SUPPORT_EXPORTOP) sb->s_export_op = &kernfs_export_ops; sb->s_time_gran = 1; + sb->s_maxbytes = MAX_LFS_FILESIZE; /* sysfs dentries and inodes don't require IO to create */ sb->s_shrink->seeks = 0;