docs: admin-guide: bring some order to the "everything else" section

The bulk of the admin guide had become a big pile of stuff haphazardly
tossed together, mostly in the catch-all "everything else" section.  Split
that section into a few broad categories and sort the documents into them
as appropriate.

No documents have been added or removed, they are just reordered.  Note
that many of these documents are severely obsolete and should be considered
for removal.

Reviewed-by: Randy Dunlap <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Jonathan Corbet

Documentation/admin-guide/index.rst

@@ -18,18 +18,41 @@ etc.
    :maxdepth: 1
 
    README
-   kernel-parameters
    devices
-   sysctl/index
 
    features
 
-This section describes CPU vulnerabilities and their mitigations.
+A big part of the kernel's administrative interface is the /proc and sysfs
+virtual filesystems; these documents describe how to interact with tem
+
+.. toctree::
+   :maxdepth: 1
+
+   sysfs-rules
+   sysctl/index
+   cputopology
+   abi
+
+Security-related documentation:
 
 .. toctree::
    :maxdepth: 1
 
    hw-vuln/index
+   LSM/index
+   perf-security
+
+Booting the kernel
+------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   bootconfig
+   kernel-parameters
+   efi-stub
+   initrd
+
 
 Tracking down and identifying problems
 --------------------------------------
@@ -53,104 +76,120 @@ problems and bugs in particular.
    kdump/index
    perf/index
    pstore-blk
+   clearing-warn-once
+   kernel-per-CPU-kthreads
+   lockup-watchdogs
+   RAS/index
+   sysrq
+
 
-sysfs
------
+Core-kernel subsystems
+----------------------
 
-A big part of the kernel's administrative interface is the sysfs virtual
-filesystem; these documents describe how to interact with sysfs.
+These documents describe core-kernel administration interfaces that are
+likely to be of interest on almost any system.
 
 .. toctree::
    :maxdepth: 1
 
-   sysfs-rules
-   abi
-
-Workload analysis
------------------
+   cgroup-v2
+   cgroup-v1/index
+   cpu-load
+   mm/index
+   module-signing
+   namespaces/index
+   numastat
+   pm/index
+   syscall-user-dispatch
 
-This is the beginning of a section with information of interest to
-application developers and system integrators doing analysis of the
-Linux kernel for safety critical applications. Documents supporting
-analysis of kernel interactions with applications, and key kernel
-subsystems expectations will be found here.
+Support for non-native binary formats.  Note that some of these
+documents are ... old ...
 
 .. toctree::
    :maxdepth: 1
 
-   workload-tracing
+   binfmt-misc
+   java
+   mono
 
-Everything else
----------------
 
-The rest of this manual consists of various unordered guides on how to
-configure specific aspects of kernel behavior to your liking.
+Block-layer and filesystem administration
+-----------------------------------------
 
 .. toctree::
    :maxdepth: 1
 
-   acpi/index
-   aoe/index
-   auxdisplay/index
    bcache
    binderfs
-   binfmt-misc
    blockdev/index
-   bootconfig
-   braille-console
-   btmrvl
-   cgroup-v1/index
-   cgroup-v2
    cifs/index
-   clearing-warn-once
-   cpu-load
-   cputopology
-   dell_rbu
    device-mapper/index
-   edid
-   efi-stub
    ext4
    filesystem-monitoring
    nfs/index
-   gpio/index
-   highuid
-   hw_random
-   initrd
    iostats
-   java
    jfs
-   kernel-per-CPU-kthreads
+   md
+   ufs
+   xfs
+
+Device-specific guides
+----------------------
+
+How to configure your hardware within your Linux system.
+
+.. toctree::
+   :maxdepth: 1
+
+   acpi/index
+   aoe/index
+   auxdisplay/index
+   braille-console
+   btmrvl
+   dell_rbu
+   edid
+   gpio/index
+   hw_random
    laptops/index
    lcd-panel-cgram
-   ldm
-   lockup-watchdogs
-   LSM/index
-   md
    media/index
-   mm/index
-   module-signing
-   mono
-   namespaces/index
-   numastat
+   nvme-multipath
    parport
-   perf-security
-   pm/index
    pnp
    rapidio
-   RAS/index
    rtc
    serial-console
    svga
-   syscall-user-dispatch
-   sysrq
    thermal/index
    thunderbolt
-   ufs
-   unicode
    vga-softcursor
    video-output
-   xfs
-   nvme-multipath
+
+Workload analysis
+-----------------
+
+This is the beginning of a section with information of interest to
+application developers and system integrators doing analysis of the
+Linux kernel for safety critical applications. Documents supporting
+analysis of kernel interactions with applications, and key kernel
+subsystems expectations will be found here.
+
+.. toctree::
+   :maxdepth: 1
+
+   workload-tracing
+
+Everything else
+---------------
+
+A few hard-to-categorize and generally obsolete documents.
+
+.. toctree::
+   :maxdepth: 1
+
+   highuid
+   ldm
+   unicode
 
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