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/Documentation/core-api/
Dpacking.rst10 One can memory-map a pointer to a carefully crafted struct over the hardware
20 A more robust alternative to struct field definitions would be to extract the
34 - Packing a CPU-usable number into a memory buffer (with hardware
36 - Unpacking a memory buffer (which has hardware constraints/quirks)
37 into a CPU-usable number.
47 The following examples cover the memory layout of a packed u64 field.
55 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
71 56 57 58 59 60 61 62 63 48 49 50 51 52 53 54 55 40 41 42 43 44 45 46 47 32 33 34 35 36 37 38 39
77 inverts bit offsets inside a byte.
84 39 38 37 36 35 34 33 32 47 46 45 44 43 42 41 40 55 54 53 52 51 50 49 48 63 62 61 60 59 58 57 56
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/Documentation/tools/rtla/
Drtla-osnoise-hist.rst5 Display a histogram of the osnoise tracer samples
19 occurrence in a histogram, displaying the results in a user-friendly way.
48 …40 0 0 0 0 0 4 2 7 2 …
54 …max: 30 30 20 20 30 40 40 40 40 …
/Documentation/arch/powerpc/
Dassociativity.rst7 of that domain. Resources subsets of a given domain that exhibit better
9 are represented as being members of a sub-grouping domain. This performance
19 A value of 1 indicates the usage of Form 1 associativity. For Form 2 associativity
28 With Form 1 a combination of ibm,associativity-reference-points, and ibm,associativity
31 The “ibm,associativity” property contains a list of one or more numbers (domainID)
34 The “ibm,associativity-reference-points” property contains a list of one or more numbers
52 "ibm,associativity-reference-points" property, Form 2 allows a large number of primary domain
59 "ibm,numa-lookup-index-table" property contains a list of one or more numbers representing
71 "ibm,numa-distance-table" property contains a list of one or more numbers representing the NUMA
80 ibm,numa-lookup-index-table = <3 0 8 40>;
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/Documentation/devicetree/bindings/mtd/
Drockchip,nand-controller.yaml73 enum: [16, 24, 40, 60, 70]
76 NFC v600 ECC 16, 24, 40, 60
79 NFC v622 ECC 16, 24, 40, 60
85 NFC v900 ECC 16, 40, 60, 70
101 enum: [16, 24, 40, 60, 70]
104 If specified it indicates that a different BCH/ECC setting is
109 NFC v622 ECC 16, 24, 40, 60
/Documentation/devicetree/bindings/
Dnuma.txt9 Systems employing a Non Uniform Memory Access (NUMA) architecture contain
11 that comprise what is commonly known as a NUMA node.
21 For the purpose of identification, each NUMA node is associated with a unique
22 token known as a node id. For the purpose of this binding
23 a node id is a 32-bit integer.
25 A device node is associated with a NUMA node by the presence of a
45 This property defines a matrix to describe the relative distances
47 It is represented as a list of node pairs and their relative distance.
52 2. The distance from a node to self (local distance) is represented
54 a value greater than 10.
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/Documentation/devicetree/bindings/ufs/
Dsnps,tc-dwc-g210.yaml18 - snps,dwc-ufshcd-1.40a
30 - snps,g210-tc-6.00-40bit
31 - const: snps,dwc-ufshcd-1.40a
46 compatible = "snps,g210-tc-6.00-40bit",
47 "snps,dwc-ufshcd-1.40a",
/Documentation/devicetree/bindings/powerpc/fsl/
Dmpc5121-psc.txt18 - interrupts : <a b> where a is the interrupt number of the
19 PSC FIFO Controller and b is a field that represents an
23 - fsl,rx-fifo-size : the size of the RX fifo slice (a multiple of 4)
24 - fsl,tx-fifo-size : the size of the TX fifo slice (a multiple of 4)
29 Similar to the UART mode a PSC can be operated in SPI mode. The compatible used
30 for that is fsl,mpc5121-psc-spi. It requires a fsl,mpc5121-psc-fifo as well.
43 - interrupts : <a b> where a is the interrupt number of the
44 PSC FIFO Controller and b is a field that represents an
51 Example for a board using PSC0 and PSC1 devices in serial mode:
57 interrupts = <40 0x8>;
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/Documentation/devicetree/bindings/clock/
Dpwm-clock.yaml7 title: An external clock signal driven by a PWM pin.
43 pwms = <&pwm2 0 40>; /* 1 / 40 ns = 25 MHz */
/Documentation/input/devices/
Dcma3000_d0x.rst8 CMA3000-D0X Product Family Specification 8281000A.02.pdf
26 axis and supports 400, 100, 40 Hz sample frequency.
99 Event code 40 (Misc)
114 3: 40 Hz Measurement mode
117 6: 40 Hz Free fall mode
/Documentation/devicetree/bindings/regulator/
Dsamsung,s2mps13.yaml13 This is a part of device tree bindings for S2M and S5M family of Power
22 # 40 LDOs
23 "^LDO([1-9]|[1-3][0-9]|40)$":
/Documentation/filesystems/ext4/
Ddirectory.rst6 In an ext4 filesystem, a directory is more or less a flat file that maps
12 associated with a directory file for the particular directory entry that
19 array. I write “almost” because it's not a linear array in the memory
21 Therefore, it is more accurate to say that a directory is a series of
22 data blocks and that each block contains a linear array of directory
24 end of the block; the last entry in the block has a record length that
37 :widths: 8 8 24 40
51 - Length of this directory entry. Must be a multiple of 4.
62 entry format shortens the name_len field and uses the space for a file
69 :widths: 8 8 24 40
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Difork.rst14 The target of a symbolic link will be stored in this field if the target
23 that stores a particular file block, the code would navigate through
24 this increasingly complicated structure. Notice that there is neither a
25 magic number nor a checksum to provide any level of confidence that the
36 Note that with this block mapping scheme, it is necessary to fill out a
37 lot of mapping data even for a large contiguous file! This inefficiency
40 Notice also that a file using this mapping scheme cannot be placed
47 tree. Under the old scheme, allocating a contiguous run of 1,000 blocks
49 mapping is reduced to a single ``struct ext4_extent`` with
51 very large files with a single extent, at a considerable reduction in
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Djournal.rst6 Introduced in ext3, the ext4 filesystem employs a journal to protect the
7 filesystem against metadata inconsistencies in the case of a system crash. Up
9 size limits) can be reserved inside the filesystem as a place to land
12 cache, a record of the data being committed is also written to the journal. At
14 final locations on disk (this could involve a lot of seeking or a lot of small
19 guarantee that the filesystem does not become stuck midway through a
24 guaranteed to be in any consistent state after a crash. If this default
25 guarantee level (``data=ordered``) is not satisfactory, there is a mount
37 or if JBD2 commit timer goes off, Ext4 performs a traditional full commit.
38 A full commit invalidates all the fast commits that happened before
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Dattributes.rst6 Extended attributes (xattrs) are typically stored in a separate data
21 block to contain a pointer to a second extended attribute block (or even
22 the remaining blocks of a cluster). In theory it is possible for each
23 attribute's value to be stored in a separate data block, though as of
29 Extended attributes, when stored after the inode, have a header
33 :widths: 8 8 24 40
50 :widths: 8 8 24 40
95 :widths: 8 8 24 40
109 - Attribute name index. There is a discussion of this below.
115 this value is relative to the start of the first entry; for a block this
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/Documentation/hwmon/
Dw83773g.rst27 The chip is wired over I2C/SMBus and specified over a temperature
28 range of -40 to +125 degrees Celsius (for local sensor) and -40 to +127
/Documentation/devicetree/bindings/hwmon/pmbus/
Dinfineon,tda38640.yaml14 The Infineon TDA38640 is a 40A Single-voltage Synchronous Buck
63 tda38640@40 {
/Documentation/userspace-api/ioctl/
Dioctl-number.rst21 system calls 'write' and 'read'. For example, a SET_FOO ioctl would
23 a GET_FOO ioctl would be _IOR, although the kernel would actually write
28 many drivers share a partial letter with other drivers.
30 If you are writing a driver for a new device and need a letter, pick an
36 The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
50 if a program calls an ioctl on the wrong device, it will get an
116 'A' 00-1F linux/apm_bios.h conflict!
117 'A' 00-0F linux/agpgart.h, conflict!
119 'A' 00-7F sound/asound.h conflict!
128 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h Dead since 2022
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/Documentation/driver-api/media/drivers/
Dtuners.rst15 - A= ALPS_API (VHF_LO=0x14, VHF_HI=0x12, UHF=0x11)
27 A= BG+DK
43 A= F-connector
82 40x2: Tuner (5V/33V), TEMIC_API.
83 40x6: Tuner 5V
85 40x9: Tuner+FM compact
97 Note: Only 40x2 series has TEMIC_API, all newer tuners have PHILIPS_API.
/Documentation/devicetree/bindings/timer/
Dmarvell,armada-370-xp-timer.txt16 - clocks : Must contain a single entry describing the clock input
32 interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
41 interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
/Documentation/leds/
Dleds-lp5562.rst58 To run a blinking white pattern::
88 .max_current = 40,
94 .max_current = 40,
100 .max_current = 40,
106 .max_current = 40,
/Documentation/devicetree/bindings/memory-controllers/
Drockchip,rk3399-dmc.yaml44 The CPU interrupt number. It should be a DCF interrupt. When DDR DVFS
45 finishes, a DCF interrupt is triggered.
53 datasheet; DO NOT use a smaller "Speed Bin" than specified for the DDR3
140 default: 40
156 default: 40
164 default: 40
204 default: 40
212 default: 40
243 default: 40
251 default: 40
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/Documentation/devicetree/bindings/hwmon/
Dti,tmp513.yaml15 that include remote sensors, a local temperature sensor, and a high-side
39 rshunt <= pga-gain * 40 * 1000 * 1000.
40 If not, it's not possible to compute a valid calibration value.
47 The range will be equal to: pga-gain * 40mV
/Documentation/devicetree/bindings/xillybus/
Dxillybus.txt4 - compatible: Should be "xillybus,xillybus-1.00.a"
14 compatible = "xillybus,xillybus-1.00.a";
16 interrupts = < 0 40 1 >;
/Documentation/ABI/testing/
Dsysfs-platform-intel-wmi-sbl-fw-update1 What: /sys/bus/wmi/devices/44FADEB1-B204-40F2-8581-394BBDC1B651/firmware_update_request
7 Bootloader (SBL). This attribute normally has a value
9 on next reboot, by writing a value of 1.
/Documentation/devicetree/bindings/sound/
Dsocionext,uniphier-aio.yaml42 Specifies a phandle to soc-glue, which is used for changing mode of S/PDIF
97 clocks = <&sys_clk 40>;
99 resets = <&sys_rst 40>;

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