Public bug reported:

Due to my Skylake-based hardware I'm trying to run the latest mainline
kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/ on my Ubuntu
16.04 LTS/xenial (Linux Mint Variant) installation. I'm using the Ukuu
kernel upgrade utility for that purpose.

Beginning with 4.12 acpi-call-dkms (1.1.0-2) fails to build.

Here the relevant excerpt of make.log

DKMS make.log for acpi-call-1.1.0 for kernel 4.12.3-041203-generic (x86_64)
...
/var/lib/dkms/acpi-call/1.1.0/build/acpi_call.c: In function ‘acpi_proc_write’:
/var/lib/dkms/acpi-call/1.1.0/build/acpi_call.c:277:9: error: implicit 
declaration of function ‘copy_from_user’ [-Werror=implicit-function-declaration]
     if (copy_from_user( input, buff, len )) {
         ^


I'm unsure if this is out of scope for Ubuntu but wanted to raise awareness 
somewhere.

** Affects: acpi-call (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 xenial

** Attachment added: "Full make.log output"
   https://bugs.launchpad.net/bugs/1705678/+attachment/4918749/+files/make.log

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https://bugs.launchpad.net/bugs/1705678

Title:
  acpi-call-dkms:  module fails to build beginning with mainline kernel
  4.12.x

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