EINVAL is used in other branches as well. Without errno.h, it ends up
undefined and the build fails. This happens with 32-bit ROSA kernels,
for example.
While at it, made the configs a bit closer to those from Ubuntu:
* disabled IDE drivers which are now barely maintained anyway;
* disabled some debugging facilities (verboseness of some drivers,
etc.);
* made some often used modules like vfat, fuse, ata_piix, etc.,
built-in.
* and so forth.
They take too much space, unfortunately. ~500 Mb per kernel flavour
amounts to 1 Gb of debuginfo packages per each kernel version we keep.
We could build the debuginfo packages on demand, I suppose, and turn
them off by default.
They might be needed to debug the users' issues and should not take too
much space now.
Just in case, build the full debug info rather than a reduced set of it.
...And set it to 3, which should only allow to print the messages with
KERN_EMERG, KERN_ALERT and KERN_CRIT levels. This should make the boot
process less noisy.
Can be overridden with loglevel=n boot option.
ASLR seems to cause hibernate-related regressions on at least one test
system: https://linux-hardware.org/index.php?probe=e6a06c64c7
When the system tries to resume, it automatically reboots after the
hibernation image has been loaded into memory.
git bisect pointed to the following commit as the first "bad" one:
commit 65fe935dd2387a4faf15314c73f5e6d31ef0217e
Author: Kees Cook <keescook@chromium.org>
Date: Mon Jun 13 15:10:02 2016 -0700
x86/KASLR, x86/power: Remove x86 hibernation restrictions
Before this commit, KASLR was disabled (unless enabled explicitly) if
the system supported hibernation.
Let us just disable KASLR for now in the 32-bit kernels - not a big deal
for home & office use, I suppose.
