[1]: https://lkml.org/lkml/2019/7/21/289

https://lkml.org/lkml/2019/7/28/214

https://lkml.org/lkml/2019/8/4/173

See Documentation/admin-guide/dynamic-debug-howto.rst for details.

https://lkml.org/lkml/2019/8/11/180

Apply commit 581ae3a (linux-4.19.57: Enable CONFIG_CRASH_DUMP).

We don't want to maintain a separate crash kernel but use our normal
kernel as a crash kernel. Enable CONFIG_CRASH_DUMP and
CONFIG_RELOCATABLE.

https://lkml.org/lkml/2019/8/25/207

https://lkml.org/lkml/2019/9/2/741

Add the current output of `make savedefconfig`.

For whatever reason `CONFIG_PCI` was removed, so manually
add it back, so, for example, S-ATA still works.

Enable ways to store Linux messages in case of panics.

    config PSTORE
    	tristate "Persistent store support"
    	select CRYPTO if PSTORE_COMPRESS
    	default n
    	help
    	   This option enables generic access to platform level
    	   persistent storage via "pstore" filesystem that can
    	   be mounted as /dev/pstore.  Only useful if you have
    	   a platform level driver that registers with pstore to
    	   provide the data, so you probably should just go say "Y"
    	   (or "M") to a platform specific persistent store driver
    	   (e.g. ACPI_APEI on X86) which will select this for you.
    	   If you don't have a platform persistent store driver,
    	   say N.

That implicitly selects the option `EFI_VARS_PSTORE` below.

    config EFI_VARS_PSTORE
    	tristate "Register efivars backend for pstore"
    	depends on EFI_VARS && PSTORE
    	default y
    	help
    	  Say Y here to enable use efivars as a backend to pstore. This
    	  will allow writing console messages, crash dumps, or anything
    	  else supported by pstore to EFI variables.

Fixes: #1249

https://lkml.org/lkml/2019/9/15/241

As MarIuX does not run on laptops, unselect this option. Mimic commit
4ea3ed2 (linux-5.3: Update configuration).

> This option enables a tickless idle system: timer interrupts
> will only trigger on an as-needed basis when the system is idle.
> This is usually interesting for energy saving.
>
> Most of the time you want to say Y here.

See commit 018f0a2 (linux-5.3: Set CONFIG_NO_HZ_IDLE=y).

> This option enables a tickless idle system: timer interrupts
> will only trigger on an as-needed basis when the system is idle.
>
> Switch on, to save power and cpu load of VM hosts.

This creates slightly smaller images, and decompresses much faster. [1]

    $ ls -l /boot/bzImage-5.3*
    -rw-r--r-- 1 root root 13181488 Sep 23 15:21 /boot/bzImage-5.3.0.mx64.291
    -rw-r--r-- 1 root root 11956784 Oct  2 16:33 /boot/bzImage-5.3.2.mx64.292

[1]: https://kernel.ubuntu.com/~cking/boot-speed-eoan-5.3/kernel-compression-method.txt

Linux 5.4-rc1 [1] is available, so remove the 5.3 Linux kernels, which
were never installed on the distmaster – especially as the proprietary
Nvidia driver was not packaged for them.

[1]: https://lkml.org/lkml/2019/9/30/642