Hi

Short story: I'm using rocko and have a recipe for Linux kernel 4.14.14 based on linux-yocto.inc, some kernel fragments end up in the resulting .config, other don't, if regenerate fragments using menuconfig + diffconfig seems ok.


Long story:
In my recipe linux-stable_4.14.bb I have an inc file:
    [...]
    require linux-stable.inc
    [...]

linux-stable.inc :

    inherit kernel
    require recipes-kernel/linux/linux-yocto.inc
    [...]
    SRC_URI += "file://defconfig \
                file://kernel_fragments/netfilter.cfg \
                file://kernel_fragments/overlayfs.cfg \
                file://kernel_fragments/verity.cfg \
                file://kernel_fragments/squashfs.cfg \
                file://kernel_fragments/modem.cfg \
                file://kernel_fragments/led_oneshot.cfg \
                file://kernel_fragments/ipsec.cfg \
                file://kernel_fragments/netbridge.cfg \
                file://kernel_fragments/atmel_hw_sha.cfg \


I have a set of kernel fragments. During `bitbake linux-stable -c kernel_configme -f` some of them end up in the .config file while others don't: led_oneshot.cfg and overlayfs.cfg are not applied in the resulting .config while verity.cfg is applied. They are all generated using menuconfig to config the kernel, then diffconfig to generate the fragment.

$ cat led_oneshot.cfg
CONFIG_LEDS_TRIGGER_ONESHOT=y

$ cat verity.cfg
CONFIG_MD=y
# CONFIG_BLK_DEV_MD is not set
# CONFIG_BCACHE is not set
CONFIG_BLK_DEV_DM_BUILTIN=y
CONFIG_BLK_DEV_DM=y
# CONFIG_DM_MQ_DEFAULT is not set
# CONFIG_DM_DEBUG is not set
CONFIG_DM_BUFIO=y
# CONFIG_DM_DEBUG_BLOCK_MANAGER_LOCKING is not set
CONFIG_DM_CRYPT=y
# CONFIG_DM_SNAPSHOT is not set
# CONFIG_DM_THIN_PROVISIONING is not set
# CONFIG_DM_CACHE is not set
# CONFIG_DM_ERA is not set
# CONFIG_DM_MIRROR is not set
# CONFIG_DM_RAID is not set
# CONFIG_DM_ZERO is not set
# CONFIG_DM_MULTIPATH is not set
# CONFIG_DM_DELAY is not set
# CONFIG_DM_UEVENT is not set
# CONFIG_DM_FLAKEY is not set
CONFIG_DM_VERITY=y
# CONFIG_DM_VERITY_FEC is not set
# CONFIG_DM_SWITCH is not set
# CONFIG_DM_LOG_WRITES is not set
# CONFIG_DM_INTEGRITY is not set

$ cat overlayfs.cfg
CONFIG_OVERLAY_FS=y
# CONFIG_OVERLAY_FS_REDIRECT_DIR is not set
# CONFIG_OVERLAY_FS_INDEX is not set

$

Now, if I go in menuconfig I can see that CONFIG_OVERLAY_FS is indeed not enabled, I then enable it and generate a new fragment, fragmentOverlay.cfg:
$ cat fragmentOverlay.cfg
CONFIG_OVERLAY_FS=y
# CONFIG_OVERLAY_FS_REDIRECT_DIR is not set
# CONFIG_OVERLAY_FS_INDEX is not set

$ md5sum *verlay*
14f88a8b2dcb256c38f6362161045831  fragmentOverlay.cfg
14f88a8b2dcb256c38f6362161045831  overlayfs.cfg

The new fragment is identical to the overlayfs.cfg (which is not applied).
I let both files in the SCR_URI:

SRC_URI += "[...]
                file://kernel_fragments/overlayfs.cfg \
                file://kernel_fragments/fragmentOverlay.cfg \
                [...]"

And now after `bitbake linux-stable -c kernel_configme -f` the resulting .config has the overlay_fs enabled:

$ cat .config | grep OVERLAY_FS
CONFIG_OVERLAY_FS=y
# CONFIG_OVERLAY_FS_REDIRECT_DIR is not set
# CONFIG_OVERLAY_FS_INDEX is not set

$ cat .config |grep CONFIG_LEDS_TRIGGER_ONESHOT
# CONFIG_LEDS_TRIGGER_ONESHOT is not set


Same contents in the fragments, one is applied while the other is not ...

Do you have any hints ?

Thanks and regards!





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