7.7.1 and building kernel modules ...

[hb <hb09@mnet-mail.de>]

... by default fails, like

$ make
make -C /lib/modules/4.7.9-64/build M=/home/knoppix/demo modules
make[1]: Entering directory '/usr/src/linux-headers-4.7.9-64'
make[2]: *** No rule to make target 'tools/objtool/objtool', needed by
'/home/knoppix/demo/hello.o'.  Stop.
Makefile:1458: recipe for target '_module_/home/knoppix/demo' failed
make[1]: *** [_module_/home/knoppix/demo] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.7.9-64'
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 2

This is - more or less - a known problem, the objtool is missing (as far
as I can see it should be in the linux-headers-4.7.9-64 package). I
didn't try but I assume that with the kernel sources you can build your
own objtool. Objtool seems to be new in 4.6 and seems to depend on
CONFIG_STACK_VALIDATION.

So a possible workaround is to disable CONFIG_STACK_VALIDATION:

$ make CONFIG_STACK_VALIDATION=
make -C /lib/modules/4.7.9-64/build M=/home/knoppix/demo modules
make[1]: Entering directory '/usr/src/linux-headers-4.7.9-64'
  CC [M]  /home/knoppix/demo/hello.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/knoppix/demo/hello.mod.o
  LD [M]  /home/knoppix/demo/hello.ko
make[1]: Leaving directory '/usr/src/linux-headers-4.7.9-64'
$