+static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *mnt)
+{
+ struct super_block *sb = mnt->mnt_sb;
+
+ if (!__mnt_is_readonly(mnt) &&
+ (ktime_get_real_seconds() + TIME_UPTIME_SEC_MAX > sb->s_time_max)) {
+ char *buf = (char *)__get_free_page(GFP_KERNEL);
+ char *mntpath = buf ? d_path(mountpoint, buf, PAGE_SIZE) : ERR_PTR(-ENOMEM);
+ struct tm tm;
+
+ time64_to_tm(sb->s_time_max, 0, &tm);
+
+ pr_warn("Mounted %s file system at %s supports timestamps until %04ld (0x%llx)\n",
+ sb->s_type->name, mntpath,
+ tm.tm_year+1900, (unsigned long long)sb->s_time_max);
+
+ free_page((unsigned long)buf);
+ }
+}
+