Reorganize the introduction to the kernel-parameters file to place
related paragraphs together:
- move module info together and near the beginning
- add a Special Handling section for dashes, underscores, double quotes,
cpu lists, and metric (KMG) suffixes. Expand the KMG suffixes to
include TPE as well.
- add a Kernel Build Options section
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.rst | 36 ++++++++------
1 file changed, 23 insertions(+), 13 deletions(-)
--- linux-next-20241025.orig/Documentation/admin-guide/kernel-parameters.rst
+++ linux-next-20241025/Documentation/admin-guide/kernel-parameters.rst
@@ -27,6 +27,16 @@ kernel command line (/proc/cmdline) and
when it loads a module, so the kernel command line can be used for
loadable modules too.
+This document may not be entirely up to date and comprehensive. The command
+"modinfo -p ${modulename}" shows a current list of all parameters of a loadable
+module. Loadable modules, after being loaded into the running kernel, also
+reveal their parameters in /sys/module/${modulename}/parameters/. Some of these
+parameters may be changed at runtime by the command
+``echo -n ${value} > /sys/module/${modulename}/parameters/${parm}``.
+
+Special handling
+----------------
+
Hyphens (dashes) and underscores are equivalent in parameter names, so::
log_buf_len=1M print-fatal-signals=1
@@ -39,8 +49,8 @@ Double-quotes can be used to protect spa
param="spaces in here"
-cpu lists:
-----------
+cpu lists
+~~~~~~~~~
Some kernel parameters take a list of CPUs as a value, e.g. isolcpus,
nohz_full, irqaffinity, rcu_nocbs. The format of this list is:
@@ -82,12 +92,17 @@ so that "nohz_full=all" is the equivalen
The semantics of "N" and "all" is supported on a level of bitmaps and holds for
all users of bitmap_parselist().
-This document may not be entirely up to date and comprehensive. The command
-"modinfo -p ${modulename}" shows a current list of all parameters of a loadable
-module. Loadable modules, after being loaded into the running kernel, also
-reveal their parameters in /sys/module/${modulename}/parameters/. Some of these
-parameters may be changed at runtime by the command
-``echo -n ${value} > /sys/module/${modulename}/parameters/${parm}``.
+Metric suffixes
+~~~~~~~~~~~~~~~
+
+The [KMG] suffix is commonly described after a number of kernel
+parameter values. 'K', 'M', 'G', 'T', 'P', and 'E' suffixes are allowed.
+These letters represent the _binary_ multipliers 'Kilo', 'Mega', 'Giga',
+'Tera', 'Peta', and 'Exa', equaling 2^10, 2^20, 2^30, 2^40, 2^50, and
+2^60 bytes respectively. Such letter suffixes can also be entirely omitted.
+
+Kernel Build Options
+--------------------
The parameters listed below are only valid if certain kernel build options
were enabled and if respective hardware is present. This list should be kept
@@ -212,10 +227,5 @@ a fixed number of characters. This limit
and is between 256 and 4096 characters. It is defined in the file
./include/uapi/asm-generic/setup.h as COMMAND_LINE_SIZE.
-Finally, the [KMG] suffix is commonly described after a number of kernel
-parameter values. These 'K', 'M', and 'G' letters represent the _binary_
-multipliers 'Kilo', 'Mega', and 'Giga', equaling 2^10, 2^20, and 2^30
-bytes respectively. Such letter suffixes can also be entirely omitted:
-
.. include:: kernel-parameters.txt
:literal:
