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/Documentation/netlink/specs/
Dtcp_metrics.yaml1 # SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
5 protocol: genetlink-legacy
10 c-family-name: tcp-metrics-genl-name
11 c-version-name: tcp-metrics-genl-version
12 max-by-define: true
13 kernel-policy: global
16 -
17 name: tcp-fastopen-cookie-max
21 attribute-sets:
22 -
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/Documentation/leds/
Dwell-known-leds.txt1 -*- org -*-
17 Notice there's a list of functions in include/dt-bindings/leds/common.h .
24 player. For example, a game controller with 4 LEDs, may be programmed with "x---"
25 to indicate player 1, "-x--" to indicate player 2 etcetera where "x" means on.
31 Good: "input*:*:player-{1,2,3,4,5}
38 Legacy: "shift-key-light" (Motorola Droid 4, capslock)
47 Legacy: "button-backlight" (Motorola Droid 4)
62 Legacy: "status-led:{red,green,blue}" (Motorola Droid 4)
65 Phones usually have multi-color status LED.
69 Good: "platform:*:charging" (allwinner sun50i, leds-cht-wcove)
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/Documentation/userspace-api/media/rc/
Drc-tables.rst1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
30 .. flat-table:: IR default keymapping
31 :header-rows: 0
32 :stub-columns: 0
36 - .. row 1
38 - Key code
40 - Meaning
42 - Key examples on IR
44 - .. row 2
46 - **Numeric keys**
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/Documentation/usb/
Dgadget_hid.rst21 HID function descriptors you want to use - E.G. something
97 device type (keyboard / mouse / joystick) - E.G.::
106 For example type: g i s t r --left-shift
112 --caps-lock and hit return. A report is then sent by the
116 --caps-lock
148 {.opt = "--left-ctrl", .val = 0x01},
149 {.opt = "--right-ctrl", .val = 0x10},
150 {.opt = "--left-shift", .val = 0x02},
151 {.opt = "--right-shift", .val = 0x20},
152 {.opt = "--left-alt", .val = 0x04},
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/Documentation/virt/kvm/x86/
Dmsr.rst1 .. SPDX-License-Identifier: GPL-2.0
4 KVM-specific MSRs
16 ---------------
24 4-byte alignment physical address of a memory area which must be
42 An odd version indicates an in-progress update.
53 Note that although MSRs are per-CPU entities, the effect of this
63 4-byte aligned physical address of a memory area which must be in
80 updates of this structure is arbitrary and implementation-dependent.
89 An odd version indicates an in-progress update.
104 tsc-related quantity to nanoseconds
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/Documentation/input/devices/
Datarikbd.rst12 provides a convenient connection point for a mouse and switch-type joysticks.
13 The ikbd processor also maintains a time-of-day clock with one second
18 The ikbd communicates with the main processor over a high speed bi-directional
41 0xF8-0xFB relative mouse position records (lsbs determined by
43 0xFC time-of-day
49 The two shift keys return different scan codes in this mode. The ENTER key
67 ---------------------------
85 ; and x is the left button state
92 +127...-128 range, the motion is broken into multiple packets.
97 ---------------------------
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/Documentation/driver-api/media/drivers/
Dcx2341x-devel.rst1 .. SPDX-License-Identifier: GPL-2.0
7 -----------------------
12 .. note:: the memory long words are little-endian ('intel format').
21 .. code-block:: none
23 ivtvctl -O min=0x02000000,max=0x020000ff
26 register space :-).
35 .. code-block:: none
37 0x00000000-0x00ffffff Encoder memory space
38 0x00000000-0x0003ffff Encode.rom
39 ???-??? MPEG buffer(s)
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/Documentation/virt/kvm/devices/
Darm-vgic.rst1 .. SPDX-License-Identifier: GPL-2.0
9 - KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0
13 controller, requiring emulated user-space devices to inject interrupts to the
18 device and guest ITS devices, see arm-vgic-v3.txt. It is not possible to
26 KVM_VGIC_V2_ADDR_TYPE_DIST (rw, 64-bit)
31 KVM_VGIC_V2_ADDR_TYPE_CPU (rw, 64-bit)
39 -E2BIG Address outside of addressable IPA range
40 -EINVAL Incorrectly aligned address
41 -EEXIST Address already configured
42 -ENXIO The group or attribute is unknown/unsupported for this device
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/Documentation/admin-guide/
Dspkguide.txt16 Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
25 http://linux-speakup.org/. Speakup is a set of patches to the standard
72 acntsa -- Accent SA
73 acntpc -- Accent PC
74 apollo -- Apollo
75 audptr -- Audapter
76 bns -- Braille 'n Speak
77 dectlk -- DecTalk Express (old and new, db9 serial only)
78 decext -- DecTalk (old) External
79 dtlk -- DoubleTalk PC
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Dkernel-parameters.txt16 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
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
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/Documentation/bpf/
Dllvm_reloc.rst1 .. SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
12 LLVM BPF backend records each relocation with the following 16-byte
31 Compiled with ``clang --target=bpf -O2 -c test.c``, the following is
32 the code with ``llvm-objdump -dr test.o``::
52 The following ``llvm-readelf -r test.o`` shows the binary values of the four
66 The following is the symbol table with ``llvm-readelf -s test.o``::
100 section offset for static variables/functions. The non-section-offset
115 10 R_BPF_64_32 call insn 32 r_offset + 4 (S + A) / 8 - 1
118 The actual to-be-relocated data (0 or section offset)
125 In another case, ``R_BPF_64_ABS64`` relocation type is used for normal 64-bit data.
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/Documentation/process/
Dmaintainer-tip.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ---------------------
11 aggregation tree for several sub-maintainer trees. The tip tree gitweb URL
16 - **x86 architecture**
22 x86-specific KVM and XEN patches.
30 mail alias which distributes mails to the x86 top-level maintainer
32 ``linux-kernel@vger.kernel.org``, otherwise your mail ends up only in
35 - **Scheduler**
37 Scheduler development takes place in the -tip tree, in the
38 sched/core branch - with occasional sub-topic trees for
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Dmaintainer-pgp-guide.rst12 Linux Foundation. Please read that document for more in-depth discussion
15 .. _`Protecting Code Integrity`: https://github.com/lfit/itpol/blob/master/protecting-code-integrit…
22 communication channels between developers via PGP-signed email exchange.
26 - Distributed source repositories (git)
27 - Periodic release snapshots (tarballs)
35 - git repositories provide PGP signatures on all tags
36 - tarballs provide detached PGP signatures with all downloads
41 -------------------------------------------
53 shift the blame for potential future security incidents to someone else.
64 ----------------------
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/Documentation/admin-guide/laptops/
Dlaptop-mode.rst2 How to conserve battery power using laptop-mode
12 ------------
31 ------------
41 located in /etc/default/laptop-mode on Debian-based systems, or in
42 /etc/sysconfig/laptop-mode on other systems.
52 -------
64 * If you mount some of your ext3/reiserfs filesystems with the -n option, then
67 wrong options -- or it will fail because it cannot write to /etc/mtab.
80 -----------
106 -------------
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/Documentation/core-api/
Dcachetlb.rst25 virtual-->physical address translations obtained from the software
59 modifications for the address space 'vma->vm_mm' in the range
60 'start' to 'end-1' will be visible to the cpu. That is, after
62 virtual addresses in the range 'start' to 'end-1'.
78 address space is available via vma->vm_mm. Also, one may
79 test (vma->vm_flags & VM_EXEC) to see if this region is
81 split-tlb type setups).
84 page table modification for address space 'vma->vm_mm' for
87 'vma->vm_mm' for virtual address 'addr'.
97 in the software page tables for address space "vma->vm_mm"
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/Documentation/crypto/
Ddescore-readme.rst1 .. SPDX-License-Identifier: GPL-2.0
13 ------------------------------------------------------------------------------
15 des - fast & portable DES encryption & decryption.
42 2. PORTABILITY to any byte-addressable host with a 32bit unsigned C type
43 3. Plug-compatible replacement for KERBEROS's low-level routines.
46 register-starved machines. My discussions with Richard Outerbridge,
51 up in a parameterized fashion so it can easily be modified by speed-daemon
58 compile on a SPARCStation 1 (cc -O4, gcc -O2):
60 this code (byte-order independent):
62 - 30us per encryption (options: 64k tables, no IP/FP)
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/Documentation/ABI/testing/
Dsysfs-bus-iio3 Contact: linux-iio@vger.kernel.org
11 Contact: linux-iio@vger.kernel.org
25 Contact: linux-iio@vger.kernel.org
31 Contact: linux-iio@vger.kernel.org
38 Contact: linux-iio@vger.kernel.org
44 The contents of the label are free-form, but there are some
51 * "proximity-wifi"
52 * "proximity-lte"
53 * "proximity-wifi-lte"
54 * "proximity-wifi-left"
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/Documentation/admin-guide/media/
Dvivid.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Each input can be a webcam, TV capture device, S-Video capture device or an HDMI
14 capture device. Each output can be an S-Video output device or an HDMI output
23 - Support for read()/write(), MMAP, USERPTR and DMABUF streaming I/O.
24 - A large list of test patterns and variations thereof
25 - Working brightness, contrast, saturation and hue controls
26 - Support for the alpha color component
27 - Full colorspace support, including limited/full RGB range
28 - All possible control types are present
29 - Support for various pixel aspect ratios and video aspect ratios
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/Documentation/gpu/
Ddrm-uapi.rst9 addition, drivers export device-specific interfaces for use by userspace
10 drivers & device-aware applications through ioctls and sysfs files.
16 Cover generic ioctls and sysfs layout here. We only need high-level
22 .. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
31 .. kernel-doc:: drivers/gpu/drm/drm_auth.c
34 .. kernel-doc:: drivers/gpu/drm/drm_auth.c
37 .. kernel-doc:: include/drm/drm_auth.h
46 .. kernel-doc:: drivers/gpu/drm/drm_lease.c
49 Open-Source Userspace Requirements
57 open-sourced userspace patches, and those patches must be reviewed and ready for
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/Documentation/filesystems/
Dporting.rst5 ---
16 ---
20 New methods: ->alloc_inode() and ->destroy_inode().
22 Remove inode->u.foo_inode_i
27 /* fs-private stuff */
35 Use FOO_I(inode) instead of &inode->u.foo_inode_i;
37 Add foo_alloc_inode() and foo_destroy_inode() - the former should allocate
38 foo_inode_info and return the address of ->vfs_inode, the latter should free
39 FOO_I(inode) (see in-tree filesystems for examples).
41 Make them ->alloc_inode and ->destroy_inode in your super_operations.
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/Documentation/bpf/standardization/
Dinstruction-set.rst27 BCP 14 `<https://www.rfc-editor.org/info/rfc2119>`_
28 `<https://www.rfc-editor.org/info/rfc8174>`_
38 -----
51 .. table:: Meaning of bit-width notation
63 For example, `u32` is a type whose valid values are all the 32-bit unsigned
64 numbers and `s16` is a type whose valid values are all the 16-bit signed
68 ---------
70 The following byteswap functions are direction-agnostic. That is,
74 * be16: Takes an unsigned 16-bit number and converts it between
75 host byte order and big-endian
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/Documentation/userspace-api/media/v4l/
Dext-ctrls-codec-stateless.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _codec-stateless-controls:
18 .. _codec-stateless-control-id:
23 .. _v4l2-codec-stateless-h264:
43 .. flat-table:: struct v4l2_ctrl_h264_sps
44 :header-rows: 0
45 :stub-columns: 0
48 * - __u8
49 - ``profile_idc``
50 -
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/Documentation/networking/
Dsnmp_counter.rst17 .. _RFC1213 ipInReceives: https://tools.ietf.org/html/rfc1213#page-26
30 .. _RFC1213 ipInDelivers: https://tools.ietf.org/html/rfc1213#page-28
41 .. _RFC1213 ipOutRequests: https://tools.ietf.org/html/rfc1213#page-28
60 .. _Explicit Congestion Notification: https://tools.ietf.org/html/rfc3168#page-6
73 .. _RFC1213 ipInHdrErrors: https://tools.ietf.org/html/rfc1213#page-27
81 .. _RFC1213 ipInAddrErrors: https://tools.ietf.org/html/rfc1213#page-27
98 .. _RFC1213 ipInUnknownProtos: https://tools.ietf.org/html/rfc1213#page-27
111 .. _RFC1213 ipInDiscards: https://tools.ietf.org/html/rfc1213#page-28
118 .. _RFC1213 ipOutDiscards: https://tools.ietf.org/html/rfc1213#page-28
125 .. _RFC1213 ipOutNoRoutes: https://tools.ietf.org/html/rfc1213#page-29
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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
80 facility that allows backward-compatible extensions to the API to be
104 the ioctl returns -ENOTTY.
122 -----------------------
139 -----------------
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/Documentation/sound/kernel-api/
Dwriting-an-alsa-driver.rst11 Architecture) <http://www.alsa-project.org/>`__ driver. The document
19 low-level driver implementation details. It only describes the standard
26 -------
56 --------------
60 sub-directories contain different modules and are dependent upon the
74 This directory and its sub-directories are for the ALSA sequencer. This
76 as snd-seq-midi, snd-seq-virmidi, etc. They are compiled only when
85 -----------------
88 to be exported to user-space, or included by several files in different
94 -----------------
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