build zfs can not found zfs.ko

[ze-zhang]

yocto 5.1
bitbake zfs can not find zfs.ko
remove configure option --enable-linux-builtin from meta-openembedded/meta-filesystems/recipes-filesystems/zfs/zfs_2.2.5.bb
because I think --enable-linux-builtin option will need to copy zfs module source into kernel tree first.

but without --enable-linux-builtin will get error:

..../build/module/os/linux/spl/spl-atomic.o needed by .....build/module/spl.o

why in riscv yocto, spl-atomic.o can not be built? I checked Kbuild/Makefile in module dir, everything is fine

[ze-zhang]

[OldManYellsAtCloud]

Just a note: this doesn't look specific to this layer, the behavior is the same without meta-riscv (with oe-core + meta-oe layers only). Maybe you want to ask this on Yocto mailing list, or on their IRC for more exposure for your question.

[OldManYellsAtCloud]

To attempt an answer also: isn't it possible that you have just stumbled upon this zfs bug? There seems to be a proposed PR also.

[ze-zhang]

@OldManYellsAtCloud this PR can not fix the yocto issue, the root cause is :
Kbuild file must be in the same dir of the kernel external module source, but in yocto, Kbuild file will be generated from Kbuild.in and put into build/module dir，so can you fix the bb file？

[ze-zhang]

I can now build out zfs.ko spl.ko, but these is in source dir, this is not accepted, my method:
1.copy Kbuild file from build/module/Kbuild to source/zfs/2.3.99/module/
2.modify module/Makefile.in, specify M=source/zfs/2.3.99/module/, MO=build/module/

I don't known why MO= (or O=) has no effect

can anybody help me?