[PROBLEM] make bindeb-pkg: When just one source line in a single driver is changed, all driver are rebuilt?

[Mirsad Todorovac]

Hi,

I am perplexed now at 6.12 stable vanilla tree, and I've noticed that after changing just one
line in ./drivers/gpu/drm/xe/tests/xe_migrate.c:226:5-11, all unrelated drivers are being BTF'd, SIGNED,
and INSTALL-ed:

  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/aht10.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/coretemp.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/atxp1.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/corsair-cpro.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/adt7475.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/axi-fan-control.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/as370-hwmon.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/chipcap2.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/aquacomputer_d5next.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/coretemp.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/applesmc.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/corsair-psu.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/corsair-cpro.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/asus_rog_ryujin.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/cros_ec_hwmon.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/asc7621.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/da9052-hwmon.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/atxp1.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/axi-fan-control.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/corsair-psu.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/da9055-hwmon.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/chipcap2.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/cros_ec_hwmon.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/da9052-hwmon.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/coretemp.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/corsair-cpro.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/hwmon/dell-smm-hwmon.ko

Is there an option to rebuild just the necessary driver that was modified?

2.

>From the list of files that were compiled, it seems that drivers/gpu/drm/xe/tests/xe_migrate.c was
not rebult:

$ grep CC ../err-6.12.0-tiny-pt-02b.log
  CC      init/version.o
  CC      init/version-timestamp.o
  CC      arch/x86/boot/version.o
  CC      arch/x86/boot/compressed/kaslr.o
  CC      arch/x86/boot/compressed/misc.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/kallsyms
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/sorttable
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/asn1_compiler
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/genksyms/genksyms.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/selinux/genheaders/genheaders
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/selinux/mdp/mdp
  YACC    debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/genksyms/parse.tab.[ch]
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/sign-file
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/insert-sys-cert
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/genksyms/parse.tab.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/genksyms/lex.lex.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/mod/modpost.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/mod/file2alias.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/mod/sumversion.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/mod/symsearch.o
  HOSTCC  debian/linux-headers-6.12.0-dirty/usr/src/linux-headers-6.12.0-dirty/scripts/basic/fixdep

But they were only BTF + INSTALL + STRIP + SIGN'ed:

$ grep drivers/gpu/drm/xe/ ../err-6.12.0-tiny-pt-02b.log
  BTF [M] drivers/gpu/drm/xe/xe.ko
  INSTALL debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/gpu/drm/xe/xe.ko
  STRIP   debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/gpu/drm/xe/xe.ko
  SIGN    debian/linux-image-6.12.0-dirty/lib/modules/6.12.0-dirty/kernel/drivers/gpu/drm/xe/xe.ko

Nothing suggests that "drivers/gpu/drm/xe/tests/xe_migrate.c" is being recompiled, though it was modified,
or at least "touch"-ed.

Is this the expected behaviour?

(I have deliberately skipped "make clean", to see if I can save some building time and grid power.)

Thank you very much.

Best regards,
Mirsad Todorovac