Linux kernel info and subpages -- a ton of this needs to be updated or tossed at this point.

New topics page [[Kernel topics|here]].

===== Linux kernel subtopics =====

  * [[cgroupsv2]]
  * [[SATA port multipliers]]
  * [[LK_Usermodehelper|User mode helper]]
  * [[Printing/debugging]]
  * [[linux_device_trees|Working with device trees]]
  * [[ASLR]]
  * [[kernel.exec-shield]]
  * [[console loglevel]]
  * [[sysfs]]
  * [[interrupts]]
  * [[I2C SMBus]]
  * [[CAN LIN buses]]

===== Networking topics (NEW) =====

  * [[phy.h]]

===== Networking topics (OLD) =====

  * [[ip_up_down]]
  * [[MII and MDIO]]
  * [[PHY_MDIO|PHY and MDIO]]
  * [[devm_ioremap_resource]]
  * [[net_device_attributes|Net device attribute files under /sys/class/net]]
  * [[ndo_change_carrier]]
  * [[network namespaces]]
  * [[ip command]]
  * [[alloc netdev etherdev]]
  * [[IPP_UP and IFF_RUNNING]]
  * [[operstate]]
  * [[phy link update]]
  * [[net ioctl]]
  * [[ifreq ethtool]]

===== Debugging stuff =====

  * [[ARM kernel panic]]

===== Upcoming topics =====

==== Kbuild system ====

  * "make xconfig" fails, pkg-config (Qt5)
  * /lib/modules/* files (modules.alias and so on)
  * ''include/linux/kconfig.h'', macro checking and so on

==== Kernel data types ====

==== Modules ====

=== General ===

  * Is there a common wrapper for ''module_init()'', ''module_exit()''?

=== Basic modules ===

=== Parameters ===


==== initcalls ====

  * ''include/linux/init.h''

==== EXPORT_SYMBOL, symbols ====

==== Device trees ====

==== System calls ====

==== Printing/debugging ====

  * pr_info, dev_dbg, netdev_dbg and so on
  * #define DEBUG
  * dynamic debugging

==== ERR_PTR, PTR_ERR, IS_ERR ====

  * https://stackoverflow.com/questions/36296130/why-does-is-err-value-cast-negative-max-errno-to-an-unsigned-long)



==== Static analysis ====

  * sparse, cocci



==== uapi/ structure ====

  * Module loading configuration (/etc/modules-load.d)

==== systemd-udev ====

==== kernel space virtual memory ====

==== mmap ====

==== UIO ====

==== sysfs ====

  * What is the value of an attribute file with perms zero?

==== Timers ====

=== Standard timers ===

=== HR timers ===

=== Tickless kernel ===

==== Synchronization ====

=== mutex/semaphore ===

=== spinlock ===

=== completion ===

=== RCU ===

==== Driver model (kobjects) ====