1.. _changes: 2 3Minimal requirements to compile the Kernel 4++++++++++++++++++++++++++++++++++++++++++ 5 6Intro 7===== 8 9This document is designed to provide a list of the minimum levels of 10software necessary to run the 4.x kernels. 11 12This document is originally based on my "Changes" file for 2.0.x kernels 13and therefore owes credit to the same people as that file (Jared Mauch, 14Axel Boldt, Alessandro Sigala, and countless other users all over the 15'net). 16 17Current Minimal Requirements 18**************************** 19 20Upgrade to at **least** these software revisions before thinking you've 21encountered a bug! If you're unsure what version you're currently 22running, the suggested command should tell you. 23 24Again, keep in mind that this list assumes you are already functionally 25running a Linux kernel. Also, not all tools are necessary on all 26systems; obviously, if you don't have any ISDN hardware, for example, 27you probably needn't concern yourself with isdn4k-utils. 28 29====================== =============== ======================================== 30 Program Minimal version Command to check the version 31====================== =============== ======================================== 32GNU C 3.2 gcc --version 33GNU make 3.81 make --version 34binutils 2.20 ld -v 35util-linux 2.10o fdformat --version 36module-init-tools 0.9.10 depmod -V 37e2fsprogs 1.41.4 e2fsck -V 38jfsutils 1.1.3 fsck.jfs -V 39reiserfsprogs 3.6.3 reiserfsck -V 40xfsprogs 2.6.0 xfs_db -V 41squashfs-tools 4.0 mksquashfs -version 42btrfs-progs 0.18 btrfsck 43pcmciautils 004 pccardctl -V 44quota-tools 3.09 quota -V 45PPP 2.4.0 pppd --version 46isdn4k-utils 3.1pre1 isdnctrl 2>&1|grep version 47nfs-utils 1.0.5 showmount --version 48procps 3.2.0 ps --version 49oprofile 0.9 oprofiled --version 50udev 081 udevd --version 51grub 0.93 grub --version || grub-install --version 52mcelog 0.6 mcelog --version 53iptables 1.4.2 iptables -V 54openssl & libcrypto 1.0.0 openssl version 55bc 1.06.95 bc --version 56Sphinx\ [#f1]_ 1.3 sphinx-build --version 57====================== =============== ======================================== 58 59.. [#f1] Sphinx is needed only to build the Kernel documentation 60 61Kernel compilation 62****************** 63 64GCC 65--- 66 67The gcc version requirements may vary depending on the type of CPU in your 68computer. 69 70Make 71---- 72 73You will need GNU make 3.81 or later to build the kernel. 74 75Binutils 76-------- 77 78The build system has, as of 4.13, switched to using thin archives (`ar T`) 79rather than incremental linking (`ld -r`) for built-in.o intermediate steps. 80This requires binutils 2.20 or newer. 81 82Perl 83---- 84 85You will need perl 5 and the following modules: ``Getopt::Long``, 86``Getopt::Std``, ``File::Basename``, and ``File::Find`` to build the kernel. 87 88BC 89-- 90 91You will need bc to build kernels 3.10 and higher 92 93 94OpenSSL 95------- 96 97Module signing and external certificate handling use the OpenSSL program and 98crypto library to do key creation and signature generation. 99 100You will need openssl to build kernels 3.7 and higher if module signing is 101enabled. You will also need openssl development packages to build kernels 4.3 102and higher. 103 104 105System utilities 106**************** 107 108Architectural changes 109--------------------- 110 111DevFS has been obsoleted in favour of udev 112(http://www.kernel.org/pub/linux/utils/kernel/hotplug/) 113 11432-bit UID support is now in place. Have fun! 115 116Linux documentation for functions is transitioning to inline 117documentation via specially-formatted comments near their 118definitions in the source. These comments can be combined with ReST 119files the Documentation/ directory to make enriched documentation, which can 120then be converted to PostScript, HTML, LaTex, ePUB and PDF files. 121In order to convert from ReST format to a format of your choice, you'll need 122Sphinx. 123 124Util-linux 125---------- 126 127New versions of util-linux provide ``fdisk`` support for larger disks, 128support new options to mount, recognize more supported partition 129types, have a fdformat which works with 2.4 kernels, and similar goodies. 130You'll probably want to upgrade. 131 132Ksymoops 133-------- 134 135If the unthinkable happens and your kernel oopses, you may need the 136ksymoops tool to decode it, but in most cases you don't. 137It is generally preferred to build the kernel with ``CONFIG_KALLSYMS`` so 138that it produces readable dumps that can be used as-is (this also 139produces better output than ksymoops). If for some reason your kernel 140is not build with ``CONFIG_KALLSYMS`` and you have no way to rebuild and 141reproduce the Oops with that option, then you can still decode that Oops 142with ksymoops. 143 144Module-Init-Tools 145----------------- 146 147A new module loader is now in the kernel that requires ``module-init-tools`` 148to use. It is backward compatible with the 2.4.x series kernels. 149 150Mkinitrd 151-------- 152 153These changes to the ``/lib/modules`` file tree layout also require that 154mkinitrd be upgraded. 155 156E2fsprogs 157--------- 158 159The latest version of ``e2fsprogs`` fixes several bugs in fsck and 160debugfs. Obviously, it's a good idea to upgrade. 161 162JFSutils 163-------- 164 165The ``jfsutils`` package contains the utilities for the file system. 166The following utilities are available: 167 168- ``fsck.jfs`` - initiate replay of the transaction log, and check 169 and repair a JFS formatted partition. 170 171- ``mkfs.jfs`` - create a JFS formatted partition. 172 173- other file system utilities are also available in this package. 174 175Reiserfsprogs 176------------- 177 178The reiserfsprogs package should be used for reiserfs-3.6.x 179(Linux kernels 2.4.x). It is a combined package and contains working 180versions of ``mkreiserfs``, ``resize_reiserfs``, ``debugreiserfs`` and 181``reiserfsck``. These utils work on both i386 and alpha platforms. 182 183Xfsprogs 184-------- 185 186The latest version of ``xfsprogs`` contains ``mkfs.xfs``, ``xfs_db``, and the 187``xfs_repair`` utilities, among others, for the XFS filesystem. It is 188architecture independent and any version from 2.0.0 onward should 189work correctly with this version of the XFS kernel code (2.6.0 or 190later is recommended, due to some significant improvements). 191 192PCMCIAutils 193----------- 194 195PCMCIAutils replaces ``pcmcia-cs``. It properly sets up 196PCMCIA sockets at system startup and loads the appropriate modules 197for 16-bit PCMCIA devices if the kernel is modularized and the hotplug 198subsystem is used. 199 200Quota-tools 201----------- 202 203Support for 32 bit uid's and gid's is required if you want to use 204the newer version 2 quota format. Quota-tools version 3.07 and 205newer has this support. Use the recommended version or newer 206from the table above. 207 208Intel IA32 microcode 209-------------------- 210 211A driver has been added to allow updating of Intel IA32 microcode, 212accessible as a normal (misc) character device. If you are not using 213udev you may need to:: 214 215 mkdir /dev/cpu 216 mknod /dev/cpu/microcode c 10 184 217 chmod 0644 /dev/cpu/microcode 218 219as root before you can use this. You'll probably also want to 220get the user-space microcode_ctl utility to use with this. 221 222udev 223---- 224 225``udev`` is a userspace application for populating ``/dev`` dynamically with 226only entries for devices actually present. ``udev`` replaces the basic 227functionality of devfs, while allowing persistent device naming for 228devices. 229 230FUSE 231---- 232 233Needs libfuse 2.4.0 or later. Absolute minimum is 2.3.0 but mount 234options ``direct_io`` and ``kernel_cache`` won't work. 235 236Networking 237********** 238 239General changes 240--------------- 241 242If you have advanced network configuration needs, you should probably 243consider using the network tools from ip-route2. 244 245Packet Filter / NAT 246------------------- 247The packet filtering and NAT code uses the same tools like the previous 2.4.x 248kernel series (iptables). It still includes backwards-compatibility modules 249for 2.2.x-style ipchains and 2.0.x-style ipfwadm. 250 251PPP 252--- 253 254The PPP driver has been restructured to support multilink and to 255enable it to operate over diverse media layers. If you use PPP, 256upgrade pppd to at least 2.4.0. 257 258If you are not using udev, you must have the device file /dev/ppp 259which can be made by:: 260 261 mknod /dev/ppp c 108 0 262 263as root. 264 265Isdn4k-utils 266------------ 267 268Due to changes in the length of the phone number field, isdn4k-utils 269needs to be recompiled or (preferably) upgraded. 270 271NFS-utils 272--------- 273 274In ancient (2.4 and earlier) kernels, the nfs server needed to know 275about any client that expected to be able to access files via NFS. This 276information would be given to the kernel by ``mountd`` when the client 277mounted the filesystem, or by ``exportfs`` at system startup. exportfs 278would take information about active clients from ``/var/lib/nfs/rmtab``. 279 280This approach is quite fragile as it depends on rmtab being correct 281which is not always easy, particularly when trying to implement 282fail-over. Even when the system is working well, ``rmtab`` suffers from 283getting lots of old entries that never get removed. 284 285With modern kernels we have the option of having the kernel tell mountd 286when it gets a request from an unknown host, and mountd can give 287appropriate export information to the kernel. This removes the 288dependency on ``rmtab`` and means that the kernel only needs to know about 289currently active clients. 290 291To enable this new functionality, you need to:: 292 293 mount -t nfsd nfsd /proc/fs/nfsd 294 295before running exportfs or mountd. It is recommended that all NFS 296services be protected from the internet-at-large by a firewall where 297that is possible. 298 299mcelog 300------ 301 302On x86 kernels the mcelog utility is needed to process and log machine check 303events when ``CONFIG_X86_MCE`` is enabled. Machine check events are errors 304reported by the CPU. Processing them is strongly encouraged. 305 306Kernel documentation 307******************** 308 309Sphinx 310------ 311 312Please see :ref:`sphinx_install` in ``Documentation/doc-guide/sphinx.rst`` 313for details about Sphinx requirements. 314 315Getting updated software 316======================== 317 318Kernel compilation 319****************** 320 321gcc 322--- 323 324- <ftp://ftp.gnu.org/gnu/gcc/> 325 326Make 327---- 328 329- <ftp://ftp.gnu.org/gnu/make/> 330 331Binutils 332-------- 333 334- <https://www.kernel.org/pub/linux/devel/binutils/> 335 336OpenSSL 337------- 338 339- <https://www.openssl.org/> 340 341System utilities 342**************** 343 344Util-linux 345---------- 346 347- <https://www.kernel.org/pub/linux/utils/util-linux/> 348 349Ksymoops 350-------- 351 352- <https://www.kernel.org/pub/linux/utils/kernel/ksymoops/v2.4/> 353 354Module-Init-Tools 355----------------- 356 357- <https://www.kernel.org/pub/linux/utils/kernel/module-init-tools/> 358 359Mkinitrd 360-------- 361 362- <https://code.launchpad.net/initrd-tools/main> 363 364E2fsprogs 365--------- 366 367- <http://prdownloads.sourceforge.net/e2fsprogs/e2fsprogs-1.29.tar.gz> 368 369JFSutils 370-------- 371 372- <http://jfs.sourceforge.net/> 373 374Reiserfsprogs 375------------- 376 377- <http://www.kernel.org/pub/linux/utils/fs/reiserfs/> 378 379Xfsprogs 380-------- 381 382- <ftp://oss.sgi.com/projects/xfs/> 383 384Pcmciautils 385----------- 386 387- <https://www.kernel.org/pub/linux/utils/kernel/pcmcia/> 388 389Quota-tools 390----------- 391 392- <http://sourceforge.net/projects/linuxquota/> 393 394 395Intel P6 microcode 396------------------ 397 398- <https://downloadcenter.intel.com/> 399 400udev 401---- 402 403- <http://www.freedesktop.org/software/systemd/man/udev.html> 404 405FUSE 406---- 407 408- <http://sourceforge.net/projects/fuse> 409 410mcelog 411------ 412 413- <http://www.mcelog.org/> 414 415Networking 416********** 417 418PPP 419--- 420 421- <ftp://ftp.samba.org/pub/ppp/> 422 423Isdn4k-utils 424------------ 425 426- <ftp://ftp.isdn4linux.de/pub/isdn4linux/utils/> 427 428NFS-utils 429--------- 430 431- <http://sourceforge.net/project/showfiles.php?group_id=14> 432 433Iptables 434-------- 435 436- <http://www.iptables.org/downloads.html> 437 438Ip-route2 439--------- 440 441- <https://www.kernel.org/pub/linux/utils/net/iproute2/> 442 443OProfile 444-------- 445 446- <http://oprofile.sf.net/download/> 447 448NFS-Utils 449--------- 450 451- <http://nfs.sourceforge.net/> 452 453Kernel documentation 454******************** 455 456Sphinx 457------ 458 459- <http://www.sphinx-doc.org/> 460