Linux kernel source is not consist with current kernel image

[quanxian]

[Bug Description]

This is a general issue. in Ubuntu 22.10, our test case will build kernel module based on current kenel.
when we install linux-source, and build the kernel module out, found it can't be insert into current system.

just like this:
|0919_172629.892|TRACE|CMD=insmod ddt_intel/cpu/sync_core_timing.ko|
insmod: ERROR: could not insert module ddt_intel/cpu/sync_core_timing.ko: Invalid module format

root cause:
linux-source-5.19.0 subversion is not the same as Linux RPLS01 5.19.0-15-generic which is default kernel.

we build this module based on default linux-source
#modinfo sync_core_timing.ko
filename: case/Processor/SERIALIZE_func_test-M/serialize/sync_core_timing.ko
license: GPL
srcversion: D5404C78B18A3199F1BC9FB
depends:
retpoline: Y
name: sync_core_timing
vermagic: 5.19.0 SMP preempt mod_unload modversions
parm: repeats:uint

a. installed linux-source
# apt-get install linux-source
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
linux-source is already the newest version (5.19.0.15.15).
0 upgraded, 0 newly installed, 0 to remove and 387 not upgraded.

b. here is default installed linux-source version
# cat /usr/src/linux-source-5.19.0/Makefile |more
# SPDX-License-Identifier: GPL-2.0
VERSION = 5
PATCHLEVEL = 19
SUBLEVEL = 0
EXTRAVERSION =
NAME = Superb Owl

c. here is default kernel installed information
# uname -a
Linux RPLS01 5.19.0-15-generic #15-Ubuntu SMP PREEMPT_DYNAMIC Tue Aug 2 07:35:59 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

[HW/SW Information]
Target Kernel: 5.19
Target Release: 22.10

[Timo Aaltonen (tjaalton)]

I don't think you're supposed to be building modules against what linux-source package provides, but by installing 'linux-headers-generic' instead.