linux-ext4 - ext4 confusion

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Date:   Mon, 5 Mar 2018 20:17:10 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-ext4@...r.kernel.org,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: ext4 confusion

Hi,

With the following kernel config entries on Linux 4.16-rc3:

CONFIG_EXT2_FS=m
# CONFIG_EXT2_FS_XATTR is not set
CONFIG_EXT3_FS=m
# CONFIG_EXT3_FS_POSIX_ACL is not set
# CONFIG_EXT3_FS_SECURITY is not set
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
# CONFIG_EXT4_ENCRYPTION is not set
# CONFIG_EXT4_DEBUG is not set
CONFIG_JBD2=y
# CONFIG_JBD2_DEBUG is not set

ext4_fill_super() tells me:

[    3.033174] EXT4-fs (sda5): couldn't mount as ext3 due to feature incompatibilities
[    3.100186] EXT4-fs (sda5): mounted filesystem with ordered data mode. Opts: (null)
[    3.102683] VFS: Mounted root (ext4 filesystem) readonly on device 8:5.

This is a new install, new filesystem. It has never been ext2 or ext3.

After bootup and before I do anything else, I can remount /dev/sda5 on / as
rw and everything is OK.

What am I doing wrong?

thanks,
-- 
~Randy