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Linux/Documentation/Changes

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Diff markup

Differences between /Documentation/Changes (Architecture sparc64) and /Documentation/Changes (Architecture mips)


  1 .. _changes:                                        1 .. _changes:
  2                                                     2 
  3 Minimal requirements to compile the Kernel          3 Minimal requirements to compile the Kernel
  4 ++++++++++++++++++++++++++++++++++++++++++          4 ++++++++++++++++++++++++++++++++++++++++++
  5                                                     5 
  6 Intro                                               6 Intro
  7 =====                                               7 =====
  8                                                     8 
  9 This document is designed to provide a list of      9 This document is designed to provide a list of the minimum levels of
 10 software necessary to run the current kernel v     10 software necessary to run the current kernel version.
 11                                                    11 
 12 This document is originally based on my "Chang     12 This document is originally based on my "Changes" file for 2.0.x kernels
 13 and therefore owes credit to the same people a     13 and therefore owes credit to the same people as that file (Jared Mauch,
 14 Axel Boldt, Alessandro Sigala, and countless o     14 Axel Boldt, Alessandro Sigala, and countless other users all over the
 15 'net).                                             15 'net).
 16                                                    16 
 17 Current Minimal Requirements                       17 Current Minimal Requirements
 18 ****************************                       18 ****************************
 19                                                    19 
 20 Upgrade to at **least** these software revisio     20 Upgrade to at **least** these software revisions before thinking you've
 21 encountered a bug!  If you're unsure what vers     21 encountered a bug!  If you're unsure what version you're currently
 22 running, the suggested command should tell you     22 running, the suggested command should tell you.
 23                                                    23 
 24 Again, keep in mind that this list assumes you     24 Again, keep in mind that this list assumes you are already functionally
 25 running a Linux kernel.  Also, not all tools a     25 running a Linux kernel.  Also, not all tools are necessary on all
 26 systems; obviously, if you don't have any PC C     26 systems; obviously, if you don't have any PC Card hardware, for example,
 27 you probably needn't concern yourself with pcm     27 you probably needn't concern yourself with pcmciautils.
 28                                                    28 
 29 ====================== ===============  ======     29 ====================== ===============  ========================================
 30         Program        Minimal version       C     30         Program        Minimal version       Command to check the version
 31 ====================== ===============  ======     31 ====================== ===============  ========================================
 32 GNU C                  5.1              gcc --     32 GNU C                  5.1              gcc --version
 33 Clang/LLVM (optional)  13.0.1           clang      33 Clang/LLVM (optional)  13.0.1           clang --version
 34 Rust (optional)        1.78.0           rustc      34 Rust (optional)        1.78.0           rustc --version
 35 bindgen (optional)     0.65.1           bindge     35 bindgen (optional)     0.65.1           bindgen --version
 36 GNU make               4.0              make -     36 GNU make               4.0              make --version
 37 bash                   4.2              bash -     37 bash                   4.2              bash --version
 38 binutils               2.25             ld -v      38 binutils               2.25             ld -v
 39 flex                   2.5.35           flex -     39 flex                   2.5.35           flex --version
 40 bison                  2.0              bison      40 bison                  2.0              bison --version
 41 pahole                 1.16             pahole     41 pahole                 1.16             pahole --version
 42 util-linux             2.10o            mount      42 util-linux             2.10o            mount --version
 43 kmod                   13               depmod     43 kmod                   13               depmod -V
 44 e2fsprogs              1.41.4           e2fsck     44 e2fsprogs              1.41.4           e2fsck -V
 45 jfsutils               1.1.3            fsck.j     45 jfsutils               1.1.3            fsck.jfs -V
 46 reiserfsprogs          3.6.3            reiser     46 reiserfsprogs          3.6.3            reiserfsck -V
 47 xfsprogs               2.6.0            xfs_db     47 xfsprogs               2.6.0            xfs_db -V
 48 squashfs-tools         4.0              mksqua     48 squashfs-tools         4.0              mksquashfs -version
 49 btrfs-progs            0.18             btrfsc     49 btrfs-progs            0.18             btrfsck
 50 pcmciautils            004              pccard     50 pcmciautils            004              pccardctl -V
 51 quota-tools            3.09             quota      51 quota-tools            3.09             quota -V
 52 PPP                    2.4.0            pppd -     52 PPP                    2.4.0            pppd --version
 53 nfs-utils              1.0.5            showmo     53 nfs-utils              1.0.5            showmount --version
 54 procps                 3.2.0            ps --v     54 procps                 3.2.0            ps --version
 55 udev                   081              udevd      55 udev                   081              udevd --version
 56 grub                   0.93             grub -     56 grub                   0.93             grub --version || grub-install --version
 57 mcelog                 0.6              mcelog     57 mcelog                 0.6              mcelog --version
 58 iptables               1.4.2            iptabl     58 iptables               1.4.2            iptables -V
 59 openssl & libcrypto    1.0.0            openss     59 openssl & libcrypto    1.0.0            openssl version
 60 bc                     1.06.95          bc --v     60 bc                     1.06.95          bc --version
 61 Sphinx\ [#f1]_         2.4.4            sphinx     61 Sphinx\ [#f1]_         2.4.4            sphinx-build --version
 62 cpio                   any              cpio -     62 cpio                   any              cpio --version
 63 GNU tar                1.28             tar --     63 GNU tar                1.28             tar --version
 64 gtags (optional)       6.6.5            gtags      64 gtags (optional)       6.6.5            gtags --version
 65 mkimage (optional)     2017.01          mkimag     65 mkimage (optional)     2017.01          mkimage --version
 66 Python (optional)      3.5.x            python     66 Python (optional)      3.5.x            python3 --version
 67 GNU AWK (optional)     5.1.0            gawk -     67 GNU AWK (optional)     5.1.0            gawk --version
 68 ====================== ===============  ======     68 ====================== ===============  ========================================
 69                                                    69 
 70 .. [#f1] Sphinx is needed only to build the Ke     70 .. [#f1] Sphinx is needed only to build the Kernel documentation
 71                                                    71 
 72 Kernel compilation                                 72 Kernel compilation
 73 ******************                                 73 ******************
 74                                                    74 
 75 GCC                                                75 GCC
 76 ---                                                76 ---
 77                                                    77 
 78 The gcc version requirements may vary dependin     78 The gcc version requirements may vary depending on the type of CPU in your
 79 computer.                                          79 computer.
 80                                                    80 
 81 Clang/LLVM (optional)                              81 Clang/LLVM (optional)
 82 ---------------------                              82 ---------------------
 83                                                    83 
 84 The latest formal release of clang and LLVM ut     84 The latest formal release of clang and LLVM utils (according to
 85 `releases.llvm.org <https://releases.llvm.org>     85 `releases.llvm.org <https://releases.llvm.org>`_) are supported for building
 86 kernels. Older releases aren't guaranteed to w     86 kernels. Older releases aren't guaranteed to work, and we may drop workarounds
 87 from the kernel that were used to support olde     87 from the kernel that were used to support older versions. Please see additional
 88 docs on :ref:`Building Linux with Clang/LLVM <     88 docs on :ref:`Building Linux with Clang/LLVM <kbuild_llvm>`.
 89                                                    89 
 90 Rust (optional)                                    90 Rust (optional)
 91 ---------------                                    91 ---------------
 92                                                    92 
 93 A recent version of the Rust compiler is requi     93 A recent version of the Rust compiler is required.
 94                                                    94 
 95 Please see Documentation/rust/quick-start.rst      95 Please see Documentation/rust/quick-start.rst for instructions on how to
 96 satisfy the build requirements of Rust support     96 satisfy the build requirements of Rust support. In particular, the ``Makefile``
 97 target ``rustavailable`` is useful to check wh     97 target ``rustavailable`` is useful to check why the Rust toolchain may not
 98 be detected.                                       98 be detected.
 99                                                    99 
100 bindgen (optional)                                100 bindgen (optional)
101 ------------------                                101 ------------------
102                                                   102 
103 ``bindgen`` is used to generate the Rust bindi    103 ``bindgen`` is used to generate the Rust bindings to the C side of the kernel.
104 It depends on ``libclang``.                       104 It depends on ``libclang``.
105                                                   105 
106 Make                                              106 Make
107 ----                                              107 ----
108                                                   108 
109 You will need GNU make 4.0 or later to build t    109 You will need GNU make 4.0 or later to build the kernel.
110                                                   110 
111 Bash                                              111 Bash
112 ----                                              112 ----
113                                                   113 
114 Some bash scripts are used for the kernel buil    114 Some bash scripts are used for the kernel build.
115 Bash 4.2 or newer is needed.                      115 Bash 4.2 or newer is needed.
116                                                   116 
117 Binutils                                          117 Binutils
118 --------                                          118 --------
119                                                   119 
120 Binutils 2.25 or newer is needed to build the     120 Binutils 2.25 or newer is needed to build the kernel.
121                                                   121 
122 pkg-config                                        122 pkg-config
123 ----------                                        123 ----------
124                                                   124 
125 The build system, as of 4.18, requires pkg-con    125 The build system, as of 4.18, requires pkg-config to check for installed
126 kconfig tools and to determine flags settings     126 kconfig tools and to determine flags settings for use in
127 'make {g,x}config'.  Previously pkg-config was    127 'make {g,x}config'.  Previously pkg-config was being used but not
128 verified or documented.                           128 verified or documented.
129                                                   129 
130 Flex                                              130 Flex
131 ----                                              131 ----
132                                                   132 
133 Since Linux 4.16, the build system generates l    133 Since Linux 4.16, the build system generates lexical analyzers
134 during build.  This requires flex 2.5.35 or la    134 during build.  This requires flex 2.5.35 or later.
135                                                   135 
136                                                   136 
137 Bison                                             137 Bison
138 -----                                             138 -----
139                                                   139 
140 Since Linux 4.16, the build system generates p    140 Since Linux 4.16, the build system generates parsers
141 during build.  This requires bison 2.0 or late    141 during build.  This requires bison 2.0 or later.
142                                                   142 
143 pahole                                            143 pahole
144 ------                                            144 ------
145                                                   145 
146 Since Linux 5.2, if CONFIG_DEBUG_INFO_BTF is s    146 Since Linux 5.2, if CONFIG_DEBUG_INFO_BTF is selected, the build system
147 generates BTF (BPF Type Format) from DWARF in     147 generates BTF (BPF Type Format) from DWARF in vmlinux, a bit later from kernel
148 modules as well.  This requires pahole v1.16 o    148 modules as well.  This requires pahole v1.16 or later.
149                                                   149 
150 It is found in the 'dwarves' or 'pahole' distr    150 It is found in the 'dwarves' or 'pahole' distro packages or from
151 https://fedorapeople.org/~acme/dwarves/.          151 https://fedorapeople.org/~acme/dwarves/.
152                                                   152 
153 Perl                                              153 Perl
154 ----                                              154 ----
155                                                   155 
156 You will need perl 5 and the following modules    156 You will need perl 5 and the following modules: ``Getopt::Long``,
157 ``Getopt::Std``, ``File::Basename``, and ``Fil    157 ``Getopt::Std``, ``File::Basename``, and ``File::Find`` to build the kernel.
158                                                   158 
159 BC                                                159 BC
160 --                                                160 --
161                                                   161 
162 You will need bc to build kernels 3.10 and hig    162 You will need bc to build kernels 3.10 and higher
163                                                   163 
164                                                   164 
165 OpenSSL                                           165 OpenSSL
166 -------                                           166 -------
167                                                   167 
168 Module signing and external certificate handli    168 Module signing and external certificate handling use the OpenSSL program and
169 crypto library to do key creation and signatur    169 crypto library to do key creation and signature generation.
170                                                   170 
171 You will need openssl to build kernels 3.7 and    171 You will need openssl to build kernels 3.7 and higher if module signing is
172 enabled.  You will also need openssl developme    172 enabled.  You will also need openssl development packages to build kernels 4.3
173 and higher.                                       173 and higher.
174                                                   174 
175 Tar                                               175 Tar
176 ---                                               176 ---
177                                                   177 
178 GNU tar is needed if you want to enable access    178 GNU tar is needed if you want to enable access to the kernel headers via sysfs
179 (CONFIG_IKHEADERS).                               179 (CONFIG_IKHEADERS).
180                                                   180 
181 gtags / GNU GLOBAL (optional)                     181 gtags / GNU GLOBAL (optional)
182 -----------------------------                     182 -----------------------------
183                                                   183 
184 The kernel build requires GNU GLOBAL version 6    184 The kernel build requires GNU GLOBAL version 6.6.5 or later to generate
185 tag files through ``make gtags``.  This is due    185 tag files through ``make gtags``.  This is due to its use of the gtags
186 ``-C (--directory)`` flag.                        186 ``-C (--directory)`` flag.
187                                                   187 
188 mkimage                                           188 mkimage
189 -------                                           189 -------
190                                                   190 
191 This tool is used when building a Flat Image T    191 This tool is used when building a Flat Image Tree (FIT), commonly used on ARM
192 platforms. The tool is available via the ``u-b    192 platforms. The tool is available via the ``u-boot-tools`` package or can be
193 built from the U-Boot source code. See the ins    193 built from the U-Boot source code. See the instructions at
194 https://docs.u-boot.org/en/latest/build/tools.    194 https://docs.u-boot.org/en/latest/build/tools.html#building-tools-for-linux
195                                                   195 
196 GNU AWK                                           196 GNU AWK
197 -------                                           197 -------
198                                                   198 
199 GNU AWK is needed if you want kernel builds to    199 GNU AWK is needed if you want kernel builds to generate address range data for
200 builtin modules (CONFIG_BUILTIN_MODULE_RANGES)    200 builtin modules (CONFIG_BUILTIN_MODULE_RANGES).
201                                                   201 
202 System utilities                                  202 System utilities
203 ****************                                  203 ****************
204                                                   204 
205 Architectural changes                             205 Architectural changes
206 ---------------------                             206 ---------------------
207                                                   207 
208 DevFS has been obsoleted in favour of udev        208 DevFS has been obsoleted in favour of udev
209 (https://www.kernel.org/pub/linux/utils/kernel    209 (https://www.kernel.org/pub/linux/utils/kernel/hotplug/)
210                                                   210 
211 32-bit UID support is now in place.  Have fun!    211 32-bit UID support is now in place.  Have fun!
212                                                   212 
213 Linux documentation for functions is transitio    213 Linux documentation for functions is transitioning to inline
214 documentation via specially-formatted comments    214 documentation via specially-formatted comments near their
215 definitions in the source.  These comments can    215 definitions in the source.  These comments can be combined with ReST
216 files the Documentation/ directory to make enr    216 files the Documentation/ directory to make enriched documentation, which can
217 then be converted to PostScript, HTML, LaTex,     217 then be converted to PostScript, HTML, LaTex, ePUB and PDF files.
218 In order to convert from ReST format to a form    218 In order to convert from ReST format to a format of your choice, you'll need
219 Sphinx.                                           219 Sphinx.
220                                                   220 
221 Util-linux                                        221 Util-linux
222 ----------                                        222 ----------
223                                                   223 
224 New versions of util-linux provide ``fdisk`` s    224 New versions of util-linux provide ``fdisk`` support for larger disks,
225 support new options to mount, recognize more s    225 support new options to mount, recognize more supported partition
226 types, and similar goodies.                       226 types, and similar goodies.
227 You'll probably want to upgrade.                  227 You'll probably want to upgrade.
228                                                   228 
229 Ksymoops                                          229 Ksymoops
230 --------                                          230 --------
231                                                   231 
232 If the unthinkable happens and your kernel oop    232 If the unthinkable happens and your kernel oopses, you may need the
233 ksymoops tool to decode it, but in most cases     233 ksymoops tool to decode it, but in most cases you don't.
234 It is generally preferred to build the kernel     234 It is generally preferred to build the kernel with ``CONFIG_KALLSYMS`` so
235 that it produces readable dumps that can be us    235 that it produces readable dumps that can be used as-is (this also
236 produces better output than ksymoops).  If for    236 produces better output than ksymoops).  If for some reason your kernel
237 is not build with ``CONFIG_KALLSYMS`` and you     237 is not build with ``CONFIG_KALLSYMS`` and you have no way to rebuild and
238 reproduce the Oops with that option, then you     238 reproduce the Oops with that option, then you can still decode that Oops
239 with ksymoops.                                    239 with ksymoops.
240                                                   240 
241 Mkinitrd                                          241 Mkinitrd
242 --------                                          242 --------
243                                                   243 
244 These changes to the ``/lib/modules`` file tre    244 These changes to the ``/lib/modules`` file tree layout also require that
245 mkinitrd be upgraded.                             245 mkinitrd be upgraded.
246                                                   246 
247 E2fsprogs                                         247 E2fsprogs
248 ---------                                         248 ---------
249                                                   249 
250 The latest version of ``e2fsprogs`` fixes seve    250 The latest version of ``e2fsprogs`` fixes several bugs in fsck and
251 debugfs.  Obviously, it's a good idea to upgra    251 debugfs.  Obviously, it's a good idea to upgrade.
252                                                   252 
253 JFSutils                                          253 JFSutils
254 --------                                          254 --------
255                                                   255 
256 The ``jfsutils`` package contains the utilitie    256 The ``jfsutils`` package contains the utilities for the file system.
257 The following utilities are available:            257 The following utilities are available:
258                                                   258 
259 - ``fsck.jfs`` - initiate replay of the transa    259 - ``fsck.jfs`` - initiate replay of the transaction log, and check
260   and repair a JFS formatted partition.           260   and repair a JFS formatted partition.
261                                                   261 
262 - ``mkfs.jfs`` - create a JFS formatted partit    262 - ``mkfs.jfs`` - create a JFS formatted partition.
263                                                   263 
264 - other file system utilities are also availab    264 - other file system utilities are also available in this package.
265                                                   265 
266 Reiserfsprogs                                     266 Reiserfsprogs
267 -------------                                     267 -------------
268                                                   268 
269 The reiserfsprogs package should be used for r    269 The reiserfsprogs package should be used for reiserfs-3.6.x
270 (Linux kernels 2.4.x). It is a combined packag    270 (Linux kernels 2.4.x). It is a combined package and contains working
271 versions of ``mkreiserfs``, ``resize_reiserfs`    271 versions of ``mkreiserfs``, ``resize_reiserfs``, ``debugreiserfs`` and
272 ``reiserfsck``. These utils work on both i386     272 ``reiserfsck``. These utils work on both i386 and alpha platforms.
273                                                   273 
274 Xfsprogs                                          274 Xfsprogs
275 --------                                          275 --------
276                                                   276 
277 The latest version of ``xfsprogs`` contains ``    277 The latest version of ``xfsprogs`` contains ``mkfs.xfs``, ``xfs_db``, and the
278 ``xfs_repair`` utilities, among others, for th    278 ``xfs_repair`` utilities, among others, for the XFS filesystem.  It is
279 architecture independent and any version from     279 architecture independent and any version from 2.0.0 onward should
280 work correctly with this version of the XFS ke    280 work correctly with this version of the XFS kernel code (2.6.0 or
281 later is recommended, due to some significant     281 later is recommended, due to some significant improvements).
282                                                   282 
283 PCMCIAutils                                       283 PCMCIAutils
284 -----------                                       284 -----------
285                                                   285 
286 PCMCIAutils replaces ``pcmcia-cs``. It properl    286 PCMCIAutils replaces ``pcmcia-cs``. It properly sets up
287 PCMCIA sockets at system startup and loads the    287 PCMCIA sockets at system startup and loads the appropriate modules
288 for 16-bit PCMCIA devices if the kernel is mod    288 for 16-bit PCMCIA devices if the kernel is modularized and the hotplug
289 subsystem is used.                                289 subsystem is used.
290                                                   290 
291 Quota-tools                                       291 Quota-tools
292 -----------                                       292 -----------
293                                                   293 
294 Support for 32 bit uid's and gid's is required    294 Support for 32 bit uid's and gid's is required if you want to use
295 the newer version 2 quota format.  Quota-tools    295 the newer version 2 quota format.  Quota-tools version 3.07 and
296 newer has this support.  Use the recommended v    296 newer has this support.  Use the recommended version or newer
297 from the table above.                             297 from the table above.
298                                                   298 
299 Intel IA32 microcode                              299 Intel IA32 microcode
300 --------------------                              300 --------------------
301                                                   301 
302 A driver has been added to allow updating of I    302 A driver has been added to allow updating of Intel IA32 microcode,
303 accessible as a normal (misc) character device    303 accessible as a normal (misc) character device.  If you are not using
304 udev you may need to::                            304 udev you may need to::
305                                                   305 
306   mkdir /dev/cpu                                  306   mkdir /dev/cpu
307   mknod /dev/cpu/microcode c 10 184               307   mknod /dev/cpu/microcode c 10 184
308   chmod 0644 /dev/cpu/microcode                   308   chmod 0644 /dev/cpu/microcode
309                                                   309 
310 as root before you can use this.  You'll proba    310 as root before you can use this.  You'll probably also want to
311 get the user-space microcode_ctl utility to us    311 get the user-space microcode_ctl utility to use with this.
312                                                   312 
313 udev                                              313 udev
314 ----                                              314 ----
315                                                   315 
316 ``udev`` is a userspace application for popula    316 ``udev`` is a userspace application for populating ``/dev`` dynamically with
317 only entries for devices actually present. ``u    317 only entries for devices actually present. ``udev`` replaces the basic
318 functionality of devfs, while allowing persist    318 functionality of devfs, while allowing persistent device naming for
319 devices.                                          319 devices.
320                                                   320 
321 FUSE                                              321 FUSE
322 ----                                              322 ----
323                                                   323 
324 Needs libfuse 2.4.0 or later.  Absolute minimu    324 Needs libfuse 2.4.0 or later.  Absolute minimum is 2.3.0 but mount
325 options ``direct_io`` and ``kernel_cache`` won    325 options ``direct_io`` and ``kernel_cache`` won't work.
326                                                   326 
327 Networking                                        327 Networking
328 **********                                        328 **********
329                                                   329 
330 General changes                                   330 General changes
331 ---------------                                   331 ---------------
332                                                   332 
333 If you have advanced network configuration nee    333 If you have advanced network configuration needs, you should probably
334 consider using the network tools from ip-route    334 consider using the network tools from ip-route2.
335                                                   335 
336 Packet Filter / NAT                               336 Packet Filter / NAT
337 -------------------                               337 -------------------
338 The packet filtering and NAT code uses the sam    338 The packet filtering and NAT code uses the same tools like the previous 2.4.x
339 kernel series (iptables).  It still includes b    339 kernel series (iptables).  It still includes backwards-compatibility modules
340 for 2.2.x-style ipchains and 2.0.x-style ipfwa    340 for 2.2.x-style ipchains and 2.0.x-style ipfwadm.
341                                                   341 
342 PPP                                               342 PPP
343 ---                                               343 ---
344                                                   344 
345 The PPP driver has been restructured to suppor    345 The PPP driver has been restructured to support multilink and to
346 enable it to operate over diverse media layers    346 enable it to operate over diverse media layers.  If you use PPP,
347 upgrade pppd to at least 2.4.0.                   347 upgrade pppd to at least 2.4.0.
348                                                   348 
349 If you are not using udev, you must have the d    349 If you are not using udev, you must have the device file /dev/ppp
350 which can be made by::                            350 which can be made by::
351                                                   351 
352   mknod /dev/ppp c 108 0                          352   mknod /dev/ppp c 108 0
353                                                   353 
354 as root.                                          354 as root.
355                                                   355 
356 NFS-utils                                         356 NFS-utils
357 ---------                                         357 ---------
358                                                   358 
359 In ancient (2.4 and earlier) kernels, the nfs     359 In ancient (2.4 and earlier) kernels, the nfs server needed to know
360 about any client that expected to be able to a    360 about any client that expected to be able to access files via NFS.  This
361 information would be given to the kernel by ``    361 information would be given to the kernel by ``mountd`` when the client
362 mounted the filesystem, or by ``exportfs`` at     362 mounted the filesystem, or by ``exportfs`` at system startup.  exportfs
363 would take information about active clients fr    363 would take information about active clients from ``/var/lib/nfs/rmtab``.
364                                                   364 
365 This approach is quite fragile as it depends o    365 This approach is quite fragile as it depends on rmtab being correct
366 which is not always easy, particularly when tr    366 which is not always easy, particularly when trying to implement
367 fail-over.  Even when the system is working we    367 fail-over.  Even when the system is working well, ``rmtab`` suffers from
368 getting lots of old entries that never get rem    368 getting lots of old entries that never get removed.
369                                                   369 
370 With modern kernels we have the option of havi    370 With modern kernels we have the option of having the kernel tell mountd
371 when it gets a request from an unknown host, a    371 when it gets a request from an unknown host, and mountd can give
372 appropriate export information to the kernel.     372 appropriate export information to the kernel.  This removes the
373 dependency on ``rmtab`` and means that the ker    373 dependency on ``rmtab`` and means that the kernel only needs to know about
374 currently active clients.                         374 currently active clients.
375                                                   375 
376 To enable this new functionality, you need to:    376 To enable this new functionality, you need to::
377                                                   377 
378   mount -t nfsd nfsd /proc/fs/nfsd                378   mount -t nfsd nfsd /proc/fs/nfsd
379                                                   379 
380 before running exportfs or mountd.  It is reco    380 before running exportfs or mountd.  It is recommended that all NFS
381 services be protected from the internet-at-lar    381 services be protected from the internet-at-large by a firewall where
382 that is possible.                                 382 that is possible.
383                                                   383 
384 mcelog                                            384 mcelog
385 ------                                            385 ------
386                                                   386 
387 On x86 kernels the mcelog utility is needed to    387 On x86 kernels the mcelog utility is needed to process and log machine check
388 events when ``CONFIG_X86_MCE`` is enabled. Mac    388 events when ``CONFIG_X86_MCE`` is enabled. Machine check events are errors
389 reported by the CPU. Processing them is strong    389 reported by the CPU. Processing them is strongly encouraged.
390                                                   390 
391 Kernel documentation                              391 Kernel documentation
392 ********************                              392 ********************
393                                                   393 
394 Sphinx                                            394 Sphinx
395 ------                                            395 ------
396                                                   396 
397 Please see :ref:`sphinx_install` in :ref:`Docu    397 Please see :ref:`sphinx_install` in :ref:`Documentation/doc-guide/sphinx.rst <sphinxdoc>`
398 for details about Sphinx requirements.            398 for details about Sphinx requirements.
399                                                   399 
400 rustdoc                                           400 rustdoc
401 -------                                           401 -------
402                                                   402 
403 ``rustdoc`` is used to generate the documentat    403 ``rustdoc`` is used to generate the documentation for Rust code. Please see
404 Documentation/rust/general-information.rst for    404 Documentation/rust/general-information.rst for more information.
405                                                   405 
406 Getting updated software                          406 Getting updated software
407 ========================                          407 ========================
408                                                   408 
409 Kernel compilation                                409 Kernel compilation
410 ******************                                410 ******************
411                                                   411 
412 gcc                                               412 gcc
413 ---                                               413 ---
414                                                   414 
415 - <ftp://ftp.gnu.org/gnu/gcc/>                    415 - <ftp://ftp.gnu.org/gnu/gcc/>
416                                                   416 
417 Clang/LLVM                                        417 Clang/LLVM
418 ----------                                        418 ----------
419                                                   419 
420 - :ref:`Getting LLVM <getting_llvm>`.             420 - :ref:`Getting LLVM <getting_llvm>`.
421                                                   421 
422 Rust                                              422 Rust
423 ----                                              423 ----
424                                                   424 
425 - Documentation/rust/quick-start.rst.             425 - Documentation/rust/quick-start.rst.
426                                                   426 
427 bindgen                                           427 bindgen
428 -------                                           428 -------
429                                                   429 
430 - Documentation/rust/quick-start.rst.             430 - Documentation/rust/quick-start.rst.
431                                                   431 
432 Make                                              432 Make
433 ----                                              433 ----
434                                                   434 
435 - <ftp://ftp.gnu.org/gnu/make/>                   435 - <ftp://ftp.gnu.org/gnu/make/>
436                                                   436 
437 Bash                                              437 Bash
438 ----                                              438 ----
439                                                   439 
440 - <ftp://ftp.gnu.org/gnu/bash/>                   440 - <ftp://ftp.gnu.org/gnu/bash/>
441                                                   441 
442 Binutils                                          442 Binutils
443 --------                                          443 --------
444                                                   444 
445 - <https://www.kernel.org/pub/linux/devel/binu    445 - <https://www.kernel.org/pub/linux/devel/binutils/>
446                                                   446 
447 Flex                                              447 Flex
448 ----                                              448 ----
449                                                   449 
450 - <https://github.com/westes/flex/releases>       450 - <https://github.com/westes/flex/releases>
451                                                   451 
452 Bison                                             452 Bison
453 -----                                             453 -----
454                                                   454 
455 - <ftp://ftp.gnu.org/gnu/bison/>                  455 - <ftp://ftp.gnu.org/gnu/bison/>
456                                                   456 
457 OpenSSL                                           457 OpenSSL
458 -------                                           458 -------
459                                                   459 
460 - <https://www.openssl.org/>                      460 - <https://www.openssl.org/>
461                                                   461 
462 System utilities                                  462 System utilities
463 ****************                                  463 ****************
464                                                   464 
465 Util-linux                                        465 Util-linux
466 ----------                                        466 ----------
467                                                   467 
468 - <https://www.kernel.org/pub/linux/utils/util    468 - <https://www.kernel.org/pub/linux/utils/util-linux/>
469                                                   469 
470 Kmod                                              470 Kmod
471 ----                                              471 ----
472                                                   472 
473 - <https://www.kernel.org/pub/linux/utils/kern    473 - <https://www.kernel.org/pub/linux/utils/kernel/kmod/>
474 - <https://git.kernel.org/pub/scm/utils/kernel    474 - <https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git>
475                                                   475 
476 Ksymoops                                          476 Ksymoops
477 --------                                          477 --------
478                                                   478 
479 - <https://www.kernel.org/pub/linux/utils/kern    479 - <https://www.kernel.org/pub/linux/utils/kernel/ksymoops/v2.4/>
480                                                   480 
481 Mkinitrd                                          481 Mkinitrd
482 --------                                          482 --------
483                                                   483 
484 - <https://code.launchpad.net/initrd-tools/mai    484 - <https://code.launchpad.net/initrd-tools/main>
485                                                   485 
486 E2fsprogs                                         486 E2fsprogs
487 ---------                                         487 ---------
488                                                   488 
489 - <https://www.kernel.org/pub/linux/kernel/peo    489 - <https://www.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/>
490 - <https://git.kernel.org/pub/scm/fs/ext2/e2fs    490 - <https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/>
491                                                   491 
492 JFSutils                                          492 JFSutils
493 --------                                          493 --------
494                                                   494 
495 - <https://jfs.sourceforge.net/>                  495 - <https://jfs.sourceforge.net/>
496                                                   496 
497 Reiserfsprogs                                     497 Reiserfsprogs
498 -------------                                     498 -------------
499                                                   499 
500 - <https://git.kernel.org/pub/scm/linux/kernel    500 - <https://git.kernel.org/pub/scm/linux/kernel/git/jeffm/reiserfsprogs.git/>
501                                                   501 
502 Xfsprogs                                          502 Xfsprogs
503 --------                                          503 --------
504                                                   504 
505 - <https://git.kernel.org/pub/scm/fs/xfs/xfspr    505 - <https://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git>
506 - <https://www.kernel.org/pub/linux/utils/fs/x    506 - <https://www.kernel.org/pub/linux/utils/fs/xfs/xfsprogs/>
507                                                   507 
508 Pcmciautils                                       508 Pcmciautils
509 -----------                                       509 -----------
510                                                   510 
511 - <https://www.kernel.org/pub/linux/utils/kern    511 - <https://www.kernel.org/pub/linux/utils/kernel/pcmcia/>
512                                                   512 
513 Quota-tools                                       513 Quota-tools
514 -----------                                       514 -----------
515                                                   515 
516 - <https://sourceforge.net/projects/linuxquota    516 - <https://sourceforge.net/projects/linuxquota/>
517                                                   517 
518                                                   518 
519 Intel P6 microcode                                519 Intel P6 microcode
520 ------------------                                520 ------------------
521                                                   521 
522 - <https://downloadcenter.intel.com/>             522 - <https://downloadcenter.intel.com/>
523                                                   523 
524 udev                                              524 udev
525 ----                                              525 ----
526                                                   526 
527 - <https://www.freedesktop.org/software/system    527 - <https://www.freedesktop.org/software/systemd/man/udev.html>
528                                                   528 
529 FUSE                                              529 FUSE
530 ----                                              530 ----
531                                                   531 
532 - <https://github.com/libfuse/libfuse/releases    532 - <https://github.com/libfuse/libfuse/releases>
533                                                   533 
534 mcelog                                            534 mcelog
535 ------                                            535 ------
536                                                   536 
537 - <https://www.mcelog.org/>                       537 - <https://www.mcelog.org/>
538                                                   538 
539 cpio                                              539 cpio
540 ----                                              540 ----
541                                                   541 
542 - <https://www.gnu.org/software/cpio/>            542 - <https://www.gnu.org/software/cpio/>
543                                                   543 
544 Networking                                        544 Networking
545 **********                                        545 **********
546                                                   546 
547 PPP                                               547 PPP
548 ---                                               548 ---
549                                                   549 
550 - <https://download.samba.org/pub/ppp/>           550 - <https://download.samba.org/pub/ppp/>
551 - <https://git.ozlabs.org/?p=ppp.git>             551 - <https://git.ozlabs.org/?p=ppp.git>
552 - <https://github.com/paulusmack/ppp/>            552 - <https://github.com/paulusmack/ppp/>
553                                                   553 
554 NFS-utils                                         554 NFS-utils
555 ---------                                         555 ---------
556                                                   556 
557 - <https://sourceforge.net/project/showfiles.p    557 - <https://sourceforge.net/project/showfiles.php?group_id=14>
558 - <https://nfs.sourceforge.net/>                  558 - <https://nfs.sourceforge.net/>
559                                                   559 
560 Iptables                                          560 Iptables
561 --------                                          561 --------
562                                                   562 
563 - <https://netfilter.org/projects/iptables/ind    563 - <https://netfilter.org/projects/iptables/index.html>
564                                                   564 
565 Ip-route2                                         565 Ip-route2
566 ---------                                         566 ---------
567                                                   567 
568 - <https://www.kernel.org/pub/linux/utils/net/    568 - <https://www.kernel.org/pub/linux/utils/net/iproute2/>
569                                                   569 
570 OProfile                                          570 OProfile
571 --------                                          571 --------
572                                                   572 
573 - <https://oprofile.sf.net/download/>             573 - <https://oprofile.sf.net/download/>
574                                                   574 
575 Kernel documentation                              575 Kernel documentation
576 ********************                              576 ********************
577                                                   577 
578 Sphinx                                            578 Sphinx
579 ------                                            579 ------
580                                                   580 
581 - <https://www.sphinx-doc.org/>                   581 - <https://www.sphinx-doc.org/>
                                                      

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