On Sun, Jan 1, 2023 at 2:48 AM Marc Kleine-Budde [off-list ref] wrote:

On 11.12.2022 22:04:07, Masahiro Yamada wrote:

quoted

scripts/Makefile.build replaces the suffix .o with .ko, then
scripts/Makefile.modpost calls the sed command to change .ko back
to the original .o suffix.

Instead of converting the suffixes back-and-forth, store the .o paths
in modules.order, and replace it with .ko in 'make modules_install'.

This avoids the unneeded sed command.

This breaks direct compilation of kernel modules (on current Linus's
master):

| $ make drivers/net/can/dev/can-dev.ko
| [...]
|   CC [M]  drivers/net/can/dev/skb.o
|   CC [M]  drivers/net/can/dev/calc_bittiming.o
|   CC [M]  drivers/net/can/dev/bittiming.o
|   CC [M]  drivers/net/can/dev/dev.o
|   CC [M]  drivers/net/can/dev/length.o
|   CC [M]  drivers/net/can/dev/netlink.o
|   LD [M]  drivers/net/can/dev/can-dev.o
| make[5]: 'drivers/net/can/dev/can-dev.mod' is up to date.
|   LDS     scripts/module.lds
|   MODPOST Module.symvers
| drivers/net/can/dev/can-dev.ko: No such file or directory
| make[1]: *** [.../linux/scripts/Makefile.modpost:129: Module.symvers] Error 1
| make: *** [.../linux/Makefile:1982: single_modules] Error 2

According to "make help" it should be possible:

|  dir/file.ko     - Build module including final link

I've bisected it to:

| first bad commit: [f65a486821cfd363833079b2a7b0769250ee21c9] kbuild: change module.order to list *.o instead of *.ko

regards,
Marc

Thanks for the report. I submitted a fix.

https://lore.kernel.org/lkml/20230101060709.208512-1-masahiroy@kernel.org/T/#u (local)

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-- 
Best Regards
Masahiro Yamada