On Mon, Jan 26, 2026 at 3:56 PM Josh Poimboeuf <[email protected]> wrote: > > When building a patch to a single-file kernel module with > CONFIG_MODULE_SRCVERSION_ALL enabled, the klp-build module link fails in > modpost: > > Diffing objects > drivers/md/raid0.o: changed function: raid0_run > Building patch module: livepatch-0001-patch-raid0_run.ko > drivers/md/raid0.c: No such file or directory > ... > > The problem here is that klp-build copied drivers/md/.raid0.o.cmd to the > module build directory, but it didn't also copy over the input source > file listed in the .cmd file: > > source_drivers/md/raid0.o := drivers/md/raid0.c > > So modpost dies due to the missing .c file which is needed for > calculating checksums for CONFIG_MODULE_SRCVERSION_ALL. > > Instead of copying the original .cmd file, just create an empty one. > Modpost only requires that it exists. The original object's build > dependencies are irrelevant for the frankenobjects used by klp-build. > > Fixes: 24ebfcd65a87 ("livepatch/klp-build: Introduce klp-build script for > generating livepatch modules") > Reported-by: Song Liu <[email protected]> > Signed-off-by: Josh Poimboeuf <[email protected]>
Tested-by: Song Liu <[email protected]> Thanks for the fix!
