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/linux/Documentation/filesystems/xfs/
H A Dxfs-self-describing-metadata.rst1 .. SPDX-License-Identifier: GPL-2.0
5 XFS Self Describing Metadata
40 Self Describing Metadata
61 self describing metadata.
63 The first, fundamental requirement of self describing metadata is that the
70 Luckily, almost all XFS metadata has magic numbers embedded already - only the
72 magic numbers. Hence we can change the on-disk format of all these objects to
75 the metadata isn't self identifying. If it contains a new magic number, it is
76 self identifying and we can do much more expansive automated verification of the
79 As a primary concern, self describing metadata needs some form of overall
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H A Dindex.rst1 .. SPDX-License-Identifier: GPL-2.0
11 xfs-delayed-logging-design
12 xfs-maintainer-entry-profile
13 xfs-self-describing-metadata
14 xfs-online-fsck-design
/linux/tools/perf/Documentation/
H A Djitdump-specification.txt5 --------------------------------------------------------
7 --------------------------------------------------------
9 --------------------------------------------------------
11 --------------------------------------------------------
17 …s the jitdump file format. The file is generated by Just-In-time compiler runtimes to save meta-da…
21 The format of the file is binary. It is self-describing in terms of endianness and is portable acro…
27 … i.e., append only mode. The file starts with a fixed size file header describing the version of t…
29 The header is followed by a series of records, each starting with a fixed size header describing th…
39 * uint32_t magic : a magic number tagging the file type. The value is 4-byte long and represent…
40 * uint32_t version : a 4-byte value representing the format version. It is currently set to 1
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/linux/tools/mm/
H A Dthpmaps2 # SPDX-License-Identifier: GPL-2.0-only
5 # Utility providing smaps-like output detailing transparent hugepage usage.
7 # ./thpmaps --help
34 return (v + (a - 1)) & ~(a - 1)
38 return v & (a - 1)
65 r[1:] -= d
66 r[:-1] -= d
67 return [np.repeat(arr, r).reshape(-1, 2) for arr in index]
82 def __init__(self, filename, element_size):
83 self.element_size = element_size
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/linux/tools/memory-model/
H A DREADME49 ----------
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/linux/Documentation/devicetree/bindings/display/panel/
H A Dtpo,tpg110.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
11 - Thierry Reding <thierry.reding@gmail.com>
20 self-describing.
22 +--------+
23 SPI -> | TPO | -> physical display
24 RGB -> | TPG110 |
25 +--------+
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/linux/include/linux/fsl/bestcomm/
H A Dbestcomm.h7 * ( by Andrey Volkov <avolkov@varma-el.com> )
8 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
20 * struct bcom_bd - Structure describing a generic BestComm buffer descriptor
38 * struct bcom_task - Structure describing a loaded BestComm task
40 * This structure is never built by the driver it self. It's built and
67 * bcom_enable - Enable a BestComm task
76 * bcom_disable - Disable a BestComm task
86 * bcom_get_task_irq - Returns the irq number of a BestComm task
91 return tsk->irq; in bcom_get_task_irq()
100 /** _bcom_next_index - Get next input index.
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/linux/Documentation/rust/
H A Dcoding-guidelines.rst1 .. SPDX-License-Identifier: GPL-2.0
10 ------------------
37 Like ``clang-format`` for the rest of the kernel, ``rustfmt`` works on
48 .. code-block:: rust
60 .. code-block:: rust
82 .. code-block:: rust
94 for single item imports -- this can be useful to minimize diffs within patch
97 .. code-block:: rust
118 --------
126 .. code-block:: rust
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/linux/Documentation/devicetree/bindings/arm/bcm/
H A Dbrcm,brcmstb.txt2 -----------------------------------------------
3 Boards with Broadcom Brahma15 ARM-based BCMxxxx (generally BCM7xxx variants)
7 - compatible: "brcm,bcm<chip_id>", "brcm,brcmstb"
11 #address-cells = <2>;
12 #size-cells = <2>;
16 Further, syscon nodes that map platform-specific registers used for general
19 - compatible: "brcm,bcm<chip_id>-sun-top-ctrl", "syscon"
20 - compatible: "brcm,bcm<chip_id>-cpu-biu-ctrl",
21 "brcm,brcmstb-cpu-biu-ctrl",
23 - compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon"
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/linux/drivers/gpu/drm/atmel-hlcdc/
H A Datmel_hlcdc_dc.h1 /* SPDX-License-Identifier: GPL-2.0-only */
7 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
8 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
95 #define ATMEL_HLCDC_LAYER_SIZE(w, h) (((w) - 1) | (((h) - 1) << 16))
116 #define ATMEL_HLCDC_LAYER_DISC_SIZE(w, h) (((w) - 1) | (((h) - 1) << 16))
238 * @self: descriptor DMA address
244 dma_addr_t self; member
338 * struct atmel_hlcdc_dc - Atmel HLCDC Display Controller.
363 * struct atmel_lcdc_dc_ops - describes atmel_lcdc ops group
371 * @lcdc_csc_init: update the color space conversion co-efficient of
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/linux/Documentation/process/
H A Dhowto.rst6 This is the be-all, end-all document on this topic. It contains
18 ------------
23 know to achieve this by describing the process you need to go through,
27 The kernel is written mostly in C, with some architecture-dependent
30 you plan to do low-level development for that architecture. Though they
34 - "The C Programming Language" by Kernighan and Ritchie [Prentice Hall]
35 - "Practical C Programming" by Steve Oualline [O'Reilly]
36 - "C: A Reference Manual" by Harbison and Steele [Prentice Hall]
60 ------------
65 described in :ref:`Documentation/process/license-rules.rst <kernel_licensing>`.
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H A Dadding-syscalls.rst9 :ref:`Documentation/process/submitting-patches.rst <submittingpatches>`.
13 ------------------------
18 kernel, there are other possibilities -- choose what fits best for your
21 - If the operations involved can be made to look like a filesystem-like
26 - If the new functionality involves operations where the kernel notifies
30 - However, operations that don't map to
31 :manpage:`read(2)`/:manpage:`write(2)`-like operations
35 - If you're just exposing runtime system information, a new node in sysfs
41 - If the operation is specific to a particular file or file descriptor, then
47 - If the operation is specific to a particular task or process, then an
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/linux/Documentation/bpf/libbpf/
H A Dlibbpf_overview.rst1 .. SPDX-License-Identifier: GPL-2.0
7 libbpf is a C-based library containing a BPF loader that takes compiled BPF
13 The following are the high-level features supported by libbpf:
15 * Provides high-level and low-level APIs for user space programs to interact
16 with BPF programs. The low-level APIs wrap all the bpf system call
17 functionality, which is useful when users need more fine-grained control
22 * Provides BPF-side APIS, including BPF helper definitions, BPF maps support,
24 * Supports BPF CO-RE mechanism, enabling BPF developers to write portable
48 (setting BPF program types, if necessary; pre-setting initial values for
87 * ``<name>__attach()`` – attaches all auto-attachable BPF programs (it’s
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/linux/arch/arc/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
3 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
90 source "arch/arc/plat-tb10x/Kconfig"
91 source "arch/arc/plat-axs10x/Kconfig"
92 source "arch/arc/plat-hsdk/Kconfig"
110 ISA for the Next Generation ARC-HS cores
128 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
130 -Caches: New Prog Model, Region Flush
131 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
134 bool "ARC-HS"
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/linux/drivers/usb/gadget/udc/cdns2/
H A Dcdns2-gadget.h1 /* SPDX-License-Identifier: GPL-2.0 */
3 * USBHS-DEV device controller driver header file
14 #include <linux/dma-direction.h>
22 * struct cdns2_ep0_regs - endpoint 0 related registers.
45 /* EP0CS - bitmasks. */
59 /* EP0FIFO - bitmasks. */
70 * struct cdns2_epx_base - base endpoint registers.
87 /* rxcon/txcon - endpoint control register bitmasks. */
88 /* Endpoint buffering: 0 - single buffering ... 3 - quad buffering. */
106 /* rxcs/txcs - endpoint control and status bitmasks. */
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/linux/Documentation/scsi/
H A Dlibsas.rst1 .. SPDX-License-Identifier: GPL-2.0
47 ------------------
75 - must be set (0/1)
78 - must be set [0,MAX_PHYS)]
81 - must be set
84 - you set this when OOB has finished and then notify
88 - this normally points to an array holding the sas
93 - set this when you (LLDD) receive an
103 - this is where you copy the IDENTIFY/FIS frame
112 - this is where primitives go when they're
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/linux/tools/power/pm-graph/
H A Dsleepgraph.py2 # SPDX-License-Identifier: GPL-2.0-only
21 # https://www.intel.com/content/www/us/en/developer/topic-technology/open/pm-graph/overview.html
23 # git@github.com:intel/pm-graph
51 # ----------------- LIBRARIES --------------------
74 print('[%09.3f] %s' % (time.time()-mystarttime, msg))
82 # ----------------- CLASSES --------------------
86 # A global, single-instance container used to
108 cgtest = -1
183 tmstart = 'SUSPEND START %Y%m%d-%H:%M:%S.%f'
184 tmend = 'RESUME COMPLETE %Y%m%d-%H:%M:%S.%f'
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/linux/LICENSES/deprecated/
H A DGFDL-1.11 Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
2 Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only
3 Valid-License-Identifier: GFDL-1.1-no-invariants-or-later
4 Valid-License-Identifier: GFDL-1.1-no-invariants-only
5 SPDX-URL: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html
6 Usage-Guide:
8 Invariant Sections, Front-Cover Texts or Back-Cover Texts.
11 userspace-api media documentation).
15 SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
17 SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only
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/linux/Documentation/livepatch/
H A Dlivepatch.rst30 - The kernel probes are the most generic. The code can be redirected by
33 - The function tracer calls the code from a predefined location that is
35 compiler using the '-pg' gcc option.
37 - Livepatching typically needs to redirect the code at the very beginning
60 Most of these changes are self contained and the function presents itself
74 The aim is to define a so-called consistency model. It attempts to define
79 kpatch: it uses kGraft's per-task consistency and syscall barrier
83 Patches are applied on a per-task basis, when the task is deemed safe to
108 a) Patching I/O-bound user tasks which are sleeping on an affected
111 b) Patching CPU-bound user tasks. If the task is highly CPU-bound
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/linux/arch/arm/mach-omap2/
H A Dcontrol.c1 // SPDX-License-Identifier: GPL-2.0-only
22 #include "cm-regbits-34xx.h"
23 #include "prm-regbits-34xx.h"
201 * omap3_ctrl_write_boot_mode - set scratchpad boot mode for the next boot
202 * @bootmode: 8-bit value to pass to some boot code
205 * system restarts. Not sure what actually uses this - it may be the
206 * bootloader, rather than the boot ROM - contrary to the preserved
218 * describing the boot process can be stored there, in omap3_ctrl_write_boot_mode()
222 * XXX This should use some omap_ctrl_writel()-type function in omap3_ctrl_write_boot_mode()
288 * be programed to issue automatic self refresh on timeout in omap3_save_scratchpad_contents()
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/linux/Documentation/userspace-api/media/
H A Dfdl-appendix.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
10 .. _fdl-preamble:
37 .. _fdl-section1:
43 .. _fdl-document:
52 .. _fdl-modified:
59 .. _fdl-secondary:
61 A "Secondary Section" is a named appendix or a front-matter section of
62 the :ref:`Document <fdl-document>` that deals exclusively with the
73 .. _fdl-invariant:
76 :ref:`Secondary Sections <fdl-secondary>` whose titles are designated,
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/linux/net/tipc/
H A Dlink.c4 * Copyright (c) 1996-2007, 2012-2016, Ericsson AB
5 * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
82 * struct tipc_link - TIPC link data structure
92 * @peer_caps: bitmap describing capabilities of peer node
266 * Simple non-static link routines (i.e. referenced outside this file)
270 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); in tipc_link_is_up()
275 return l->state == LINK_PEER_RESET; in tipc_link_peer_is_down()
280 return l->stat in tipc_link_is_reset()
478 tipc_link_create(struct net * net,char * if_name,int bearer_id,int tolerance,char net_plane,u32 mtu,int priority,u32 min_win,u32 max_win,u32 session,u32 self,u32 peer,u8 * peer_id,u16 peer_caps,struct tipc_link * bc_sndlink,struct tipc_link * bc_rcvlink,struct sk_buff_head * inputq,struct sk_buff_head * namedq,struct tipc_link ** link) tipc_link_create() argument
2675 u32 self = tipc_own_addr(net); __tipc_nl_add_link() local
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/linux/tools/lib/bpf/
H A Dbtf.c1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
35 /* raw BTF data in non-native endianness */
47 * +----
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/linux/drivers/block/drbd/
H A Ddrbd_receiver.c1 // SPDX-License-Identifier: GPL-2.0-only
7 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
8 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
9 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
73 /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD in __drbd_alloc_pages()
74 * "criss-cross" setup, that might cause write-out on some other DRBD, in __drbd_alloc_pages()
93 * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled)
105 * We do not use max-buffers as hard limit, because it could lead to
106 * congestion and further to a distributed deadlock during online-verify or
107 * (checksum based) resync, if the max-buffers, socket buffer sizes and
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/linux/include/linux/usb/
H A Dgadget.h1 // SPDX-License-Identifier: GPL-2.0
5 * We call the USB code inside a Linux-based peripheral device a "gadget"
6 * driver, except for the hardware-specific bus glue. One USB host can
11 * (C) Copyright 2002-2004 by David Brownell
35 * struct usb_request - describes one i/o request
42 * @sg: a scatterlist for SG-capable controllers.
59 * its buffer may be re-used. The function will always be called with
74 * Code "-ESHUTDOW
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