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/Documentation/devicetree/bindings/arm/omap/
Domap.txt5 On top of that an omap_device is created to extend the platform_device
11 to move data from hwmod to device-tree representation.
15 - compatible: Every devices present in OMAP SoC should be in the
17 - ti,hwmods: list of hwmod names (ascii strings), that comes from the OMAP
22 - ti,no_idle_on_suspend: When present, it prevents the PM to idle the module
24 - ti,no-reset-on-init: When present, the module should not be reset at init
25 - ti,no-idle-on-init: When present, the module should not be idled at init
26 - ti,no-idle: When present, the module is never allowed to idle.
31 compatible = "ti,omap4-spinlock";
37 - General Purpose devices
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/Documentation/devicetree/bindings/bus/
Dti-sysc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/bus/ti-sysc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Tony Lindgren <tony@atomide.com>
22 module clocks, idle modes and interconnect level resets.
31 pattern: "^target-module(@[0-9a-f]+)?$"
35 - items:
36 - enum:
37 - ti,sysc-omap2
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/Documentation/devicetree/bindings/gpio/
Dti,omap-gpio.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/gpio/ti,omap-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Grygorii Strashko <grygorii.strashko@ti.com>
13 The general-purpose interface combines general-purpose input/output (GPIO) banks.
14 Each GPIO banks provides up to 32 dedicated general-purpose pins with input
15 and output capabilities; interrupt generation in active mode and wake-up
16 request generation in idle mode upon the detection of external events.
21 - enum:
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/Documentation/arch/x86/x86_64/
Dboot-options.rst1 .. SPDX-License-Identifier: GPL-2.0
27 This option will be useful if you have no interest in any
39 Do not opt-in to Local MCE delivery. Use legacy method
43 Disabled by default on AMD Fam10h and older because some BIOS
47 in a reboot. On Intel systems it is enabled by default.
52 Sets the time in us to wait for other CPUs on machine checks. 0
55 Don't overwrite the bios-set CMCI threshold. This boot option
62 Force-enable recoverable machine check code paths
73 Use IO-APIC. Default
76 Don't use the IO-APIC.
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/Documentation/devicetree/bindings/memory-controllers/
Dti,gpmc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/ti,gpmc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Tony Lindgren <tony@atomide.com>
11 - Roger Quadros <rogerq@kernel.org>
16 - Asynchronous SRAM-like memories and ASICs
17 - Asynchronous, synchronous, and page mode burst NOR flash
18 - NAND flash
19 - Pseudo-SRAM devices
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/Documentation/networking/device_drivers/hamradio/
Dz8530drv.rst1 .. SPDX-License-Identifier: GPL-2.0
5 SCC.C - Linux driver for Z8530 based HDLC cards for AX.25
14 1. ftp://ftp.ccac.rwth-aachen.de/pub/jr/z8530drv-utils_3.0-3.tar.gz
16 2. ftp://ftp.pspt.fi/pub/ham/linux/ax25/z8530drv-utils_3.0-3.tar.gz
20 Linux Kernel AX.25 documentation and programs, is available on
41 AX.25-HOWTO on how to emulate a KISS TNC on network device drivers.
54 please read 'man insmod' that comes with module-init-tools.
64 of your rc.*-files. This has to be done BEFORE you can
82 irq 5 # IRQ No. 5
85 escc no # enhanced SCC chip? (8580/85180/85280)
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/Documentation/scheduler/
Dsched-ext.rst6 programs - the BPF scheduler.
9 algorithm can be implemented on top.
14 * The BPF scheduler can be turned on and off dynamically anytime.
16 * The system integrity is maintained no matter what the BPF scheduler does.
18 a runnable task stalls, or on invoking the SysRq key sequence
19 :kbd:`SysRq-S`.
24 `sched_ext_dump` tracepoint. The SysRq key sequence :kbd:`SysRq-D`
35 .. code-block:: none
54 in ``ops->flags``, all ``SCHED_NORMAL``, ``SCHED_BATCH``, ``SCHED_IDLE``, and
58 set in ``ops->flags``, only tasks with the ``SCHED_EXT`` policy are scheduled
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/Documentation/RCU/Design/Memory-Ordering/
DTree-RCU-Memory-Ordering.rst2 A Tour Through TREE_RCU's Grace-Period Memory Ordering
13 grace-period memory ordering guarantee is provided.
18 RCU grace periods provide extremely strong memory-ordering guarantees
19 for non-idle non-offline code.
22 period that are within RCU read-side critical sections.
25 of that grace period that are within RCU read-side critical sections.
27 Note well that RCU-sched read-side critical sections include any region
30 an extremely small region of preemption-disabled code, one can think of
31 ``synchronize_rcu()`` as ``smp_mb()`` on steroids.
37 a linked RCU-protected data structure, and phase two frees that element.
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/Documentation/i2c/
Dgpio-fault-injection.rst8 injection driver can create special states on the bus which the other I2C bus
12 'i2c-fault-injector' subdirectory in the Kernel debugfs filesystem, usually
15 injection. They will be described now along with their intended use-cases.
21 -----
25 "echo 0 > scl" you force SCL low and thus, no communication will be possible
31 -----
48 there are I2C client devices which detect a stuck SDA on their side and release
49 it on their own after a few milliseconds. Also, there might be an external
51 and will init a bus recovery on its own. If you want to implement bus recovery
56 --------------------------
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/Documentation/admin-guide/device-mapper/
Ddm-raid.rst2 dm-raid
5 The device-mapper RAID (dm-raid) target provides a bridge from DM to MD.
6 It allows the MD RAID drivers to be accessed using a device-mapper
11 -----------------------
20 raid0 RAID0 striping (no resilience)
26 - Transitory layout
29 - rotating parity 0 with data continuation
32 - rotating parity N with data continuation
35 - rotating parity 0 with data restart
38 - rotating parity N with data restart
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/Documentation/admin-guide/
Dkernel-parameters.txt14 Format: { force | on | off | strict | noirq | rsdt |
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
25 default _serial_ console on ARM64
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Dcgroup-v2.rst1 .. _cgroup-v2:
10 This is the authoritative documentation on the design, interface and
11 conventions of cgroup v2. It describes all userland-visible aspects
14 v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgroup-v1>`.
19 1-1. Terminology
20 1-2. What is cgroup?
22 2-1. Mounting
23 2-2. Organizing Processes and Threads
24 2-2-1. Processes
25 2-2-2. Threads
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/Documentation/admin-guide/cgroup-v1/
Dcpusets.rst11 - Portions Copyright (c) 2004-2006 Silicon Graphics, Inc.
12 - Modified by Paul Jackson <pj@sgi.com>
13 - Modified by Christoph Lameter <cl@linux.com>
14 - Modified by Paul Menage <menage@google.com>
15 - Modified by Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
41 ----------------------
45 an on-line node that contains memory.
51 job placement on large systems.
54 Documentation/admin-guide/cgroup-v1/cgroups.rst.
61 schedule a task on a CPU that is not allowed in its cpus_allowed
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/Documentation/admin-guide/pm/
Dcpufreq.rst1 .. SPDX-License-Identifier: GPL-2.0
20 Operating Performance Points or P-states (in ACPI terminology). As a rule,
24 time (or the more power is drawn) by the CPU in the given P-state. Therefore
29 as possible and then there is no reason to use any P-states different from the
30 highest one (i.e. the highest-performance frequency/voltage configuration
38 put into different P-states.
41 capacity, so as to decide which P-states to put the CPUs into. Of course, since
43 repeatedly on a regular basis. The activity by which this happens is referred
64 information on the available P-states (or P-state ranges in some cases) and
65 access platform-specific hardware interfaces to change CPU P-states as requested
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/Documentation/spi/
Dspi-summary.rst5 02-Feb-2012
8 ------------
14 The three signal wires hold a clock (SCK, often on the order of 10 MHz),
17 clocking modes through which data is exchanged; mode-0 and mode-3 are most
32 - SPI may be used for request/response style device protocols, as with
35 - It may also be used to stream data in either direction (half duplex),
38 - Some devices may use eight bit words. Others may use different word
39 lengths, such as streams of 12-bit or 20-bit digital samples.
41 - Words are usually sent with their most significant bit (MSB) first,
44 - Sometimes SPI is used to daisy-chain devices, like shift registers.
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/Documentation/accel/qaic/
Daic100.rst1 .. SPDX-License-Identifier: GPL-2.0-only
10 The Qualcomm Cloud AI 100/AIC100 family of products (including SA9000P - part of
16 (x8). An individual SoC on a card can have up to 16 NSPs for running workloads.
17 Each SoC has an A53 management CPU. On card, there can be up to 32 GB of DDR.
20 performance. AIC100 cards are multi-user capable and able to execute workloads
26 An AIC100 card consists of an AIC100 SoC, on-card DDR, and a set of misc
39 AIC100 implements MSI but does not implement MSI-X. AIC100 prefers 17 MSIs to
44 hardware. AIC100 provides 3, 64-bit BARs.
51 * The third BAR is variable in size based on an individual AIC100's
52 configuration, but defaults to 64K. This BAR currently has no purpose.
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/Documentation/virt/uml/
Duser_mode_linux_howto_v2.rst1 .. SPDX-License-Identifier: GPL-2.0
25 Most OSes today have built-in support for a number of "fake"
27 User Mode Linux takes this concept to the ultimate extreme - there
30 concepts which map onto something provided by the host - files, sockets,
36 The UML kernel is just a process running on Linux - same as any other
39 The UML userspace, however, is a bit different. The Linux kernel on the
41 on a UML instance is trying to do and making the UML kernel handle all
57 * You can run a usermode kernel as a non-root user (you may need to
72 dependent on what UML does (very useful for things like tests).
81 on par with most other virtualization packages, its userspace is
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/Documentation/networking/
Dbonding.rst1 .. SPDX-License-Identifier: GPL-2.0
11 Corrections, HA extensions: 2000/10/03-15:
13 - Willy Tarreau <willy at meta-x.org>
14 - Constantine Gavrilov <const-g at xpert.com>
15 - Chad N. Tindel <ctindel at ieee dot org>
16 - Janice Girouard <girouard at us dot ibm dot com>
17 - Jay Vosburgh <fubar at us dot ibm dot com>
22 - Mitch Williams <mitch.a.williams at intel.com>
35 the original tools from extreme-linux and beowulf sites will not work
77 8.3 Painfully Slow Or No Failed Link Detection By Miimon
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Dip-sysctl.rst1 .. SPDX-License-Identifier: GPL-2.0
10 ip_forward - BOOLEAN
11 - 0 - disabled (default)
12 - not 0 - enabled
20 ip_default_ttl - INTEGER
25 ip_no_pmtu_disc - INTEGER
27 fragmentation-required ICMP is received, the PMTU to this
30 to raise min_pmtu to the smallest interface MTU on your system
35 implicitly setting IP_PMTUDISC_DONT on every created socket.
38 accept fragmentation-needed errors if the underlying protocol
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Darcnet-hardware.rst1 .. SPDX-License-Identifier: GPL-2.0
11 2) This file is no longer Linux-specific. It should probably be moved out
17 e-mail apenwarr@worldvisions.ca with any settings for your particular card,
31 100 Mbps card to a 2.5 Mbps card, and so on. From what I hear, my driver does
39 There are two "types" of ARCnet - STAR topology and BUS topology. This
46 well-designed standard. It uses something called "modified token passing"
47 which makes it completely incompatible with so-called "Token Ring" cards,
63 programming interface also means that when high-performance hardware
68 limit on their packet sizes; standard ARCnet can only send packets that are
73 although they are generally kept down to the Ethernet-style 1500 bytes.
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/Documentation/networking/device_drivers/ethernet/stmicro/
Dstmmac.rst1 .. SPDX-License-Identifier: GPL-2.0+
13 - In This Release
14 - Feature List
15 - Kernel Configuration
16 - Command Line Parameters
17 - Driver Information and Notes
18 - Debug Information
19 - Support
33 (and older) and DesignWare(R) Cores Ethernet Quality-of-Service version 4.0
35 DesignWare(R) Cores XGMAC - 10G Ethernet MAC and DesignWare(R) Cores
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/Documentation/core-api/
Dcpu_hotplug.rst26 A more novel use of CPU-hotplug support is its use today in suspend resume
27 support for SMP. Dual-core and HT support makes even a laptop run SMP kernels
60 Once set during boot time discovery phase, the map is static, i.e no bits
75 from the map depending on the event is hot-add/hot-remove. There are currently
76 no locking rules as of now. Typical usage is to init topology during boot,
80 be read-only for most use. When setting up per-cpu resources almost always use
91 available on multiple architectures including ARM, MIPS, PowerPC and X86. The
94 $ ls -lh /sys/devices/system/cpu
96 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu0
97 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu1
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/Documentation/trace/
Dhistogram.rst11 aggregate trace event data into histograms. For information on
19 aggregates event hits into a hash table keyed on one or more trace
33 numeric fields - on an event hit, the value(s) will be added to a
35 in place of an explicit value field - this is simply a count of
45 useful for providing more fine-grained summaries of event data.
69 numeric fields are displayed as base-10 integers. This can be
76 .sym-offset display an address as a symbol and offset
83 .graph display a bar-graph of a value
91 - only the 'hex' modifier can be used for values (because values
94 - the 'execname' modifier can only be used on a 'common_pid'. The
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/Documentation/dev-tools/
Dkgdb.rst15 Kdb is simplistic shell-style interface which you can use on a system
22 kernel built-ins or in kernel modules if the code was built with
35 be debugged runs on the target machine. The development machine runs an
39 connection a developer makes with gdb depends on the availability of
40 kgdb I/O modules compiled as built-ins or loadable kernel modules in the
46 - In order to enable compilation of kdb, you must first enable kgdb.
48 - The kgdb test compile options are described in the kgdb test suite
52 ------------------------------
55 :menuselection:`Kernel hacking --> Kernel debugging` and select
60 will want to turn on ``CONFIG_DEBUG_INFO`` which is called
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/Documentation/virt/kvm/
Dapi.rst1 .. SPDX-License-Identifier: GPL-2.0
4 The Definitive KVM (Kernel-based Virtual Machine) API Documentation
13 - System ioctls: These query and set global attributes which affect the
17 - VM ioctls: These query and set attributes that affect an entire virtual
24 - vcpu ioctls: These query and set attributes that control the operation
32 - device ioctls: These query and set attributes that control the operation
43 can be used to issue system ioctls. A KVM_CREATE_VM ioctl on this
45 ioctls. A KVM_CREATE_VCPU or KVM_CREATE_DEVICE ioctl on a VM fd will
47 the new resource. Finally, ioctls on a vcpu or device fd can be used
55 the API. See "General description" for details on the ioctl usage
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