Kernel module does not compile with Linux 4.9

[HarryE]

The kernel module is not compiling with Virtual Box 5.1.10 for Debian Jessie and Linux 4.9. I get the following compile error:

In file included from ./arch/x86/include/asm/acpi.h:33:0,
                 from ./arch/x86/include/asm/fixmap.h:19,
                 from ./arch/x86/include/asm/apic.h:11,
                 from ./arch/x86/include/asm/smp.h:12,
                 from ./arch/x86/include/asm/mmzone_64.h:10,
                 from ./arch/x86/include/asm/mmzone.h:4,
                 from ./include/linux/mmzone.h:889,
                 from ./include/linux/gfp.h:5,
                 from ./include/linux/slab.h:14,
                 from /tmp/vbox.0/linux/../SUPDrvInternal.h:80,
                 from /tmp/vbox.0/linux/SUPDrv-linux.c:32:
./arch/x86/include/asm/realmode.h: In function 'real_mode_size_needed':
./arch/x86/include/asm/realmode.h:66:2: error: implicit declaration of function 'ALIGN' [-Werror=implicit-function-declaration]
  return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
  ^

I included my kernel configuration.

[joeAverage]

same here with Fedora 25, my deconfig (attached) and VirtualBox-5.1-5.1.10_112026_fedora25-1.x86_64.rpm

If I do a kernel compile with "make alldefconfig setting" vbox modules will be build without error !

there must be a setting in my defconfig that impedes the building of vbox modules with kernel 4.9. But which ?

my defconfig has been working during the whole 4.8-series

[joeAverage]

defconfig for my box

[zdavatz]

Interesting, with Kernel 4.9 I get:

/usr/src/linux> sudo make alldefconfig setting
scripts/kconfig/conf  --alldefconfig Kconfig
#
# configuration written to .config
#
scripts/kconfig/conf  --silentoldconfig Kconfig
make[1]: *** Keine Regel, um „setting“ zu erstellen.  Schluss.
Makefile:525: die Regel für Ziel „__build_one_by_one“ scheiterte
make: *** [__build_one_by_one] Fehler 2

[zdavatz]

I normally just run

make silentoldconfig

and that always used to work.