[microblaze-uclinux] Problem with packet_mmap

["Curran, Tom" <Tom.Curran@xxxxxxxxx>]

Further examination of my issue with dhcpcd not working led me to
enabling "Packet socket" and "Packet socket:  mmapped IO" in the kernel
config networking options.  Enabling "Packet socket:  mmapped IO" leads
to a kernel build failure:

undefined reference to vm_insert_page() in function 'packet_mmap'

Console snippet of error message:
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  CHK     include/linux/compile.h
  GEN     usr/initramfs_data.cpio.gz
  AS      usr/initramfs_data.o
  LD      usr/built-in.o
  CC      net/packet/af_packet.o
  LD      net/packet/built-in.o
  LD      net/built-in.o
  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      vmlinux
net/built-in.o: In function `packet_mmap':
net/built-in.o(.text+0x6b30c): undefined reference to `vm_insert_page'
make[1]: *** [vmlinux] Error 1
make[1]: Leaving directory `/mnt/devtools/PetaLinux/software/linux-
2.6.x-petalogix'
make: *** [linux] Error 1
Xil_92:[root@localhost petalinux-dist]#

I found an old post from uclinux-dev
(http://readlist.com/lists/uclinux.org/uclinux-dev/0/4303.html) that
indicates this issue affects mmu-less architectures:

<snip>
> vm_insert_page() is in mm/memory.c, but mm/Makefile doesn't include it

> in the !MMU case. Instead, mm/Makefile uses mm/nommu.c, which doesn't 
> have a vm_insert_page(). So, either nommu.c needs an equivalent for 
> vm_insert_page(), or CONFIG_PACKET_MMAP needs to be made dependent on 
> CONFIG_MMU.
<snip>

That would obviously include my current Microblaze project with
PetaLinux.  Does anyone have any insights for a fix?  A patch?

BTW, interestingly enough, enabling "Packet socket" did not fix the boot
error message I get from dhcpcd (dhcpcd[41]: dhcpStart: socket: Address
family not supported by protocol).

Best Regards,
Tom

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