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/linux-6.14.4/arch/x86/kernel/
Dsmp.c1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * (c) 1998-99, 2000, 2009 Ingo Molnar <[email protected]>
9 * i386 and x86_64 integration by Glauber Costa <[email protected]>
42 * Pentium, Pentium Pro, II, III (and all CPUs) have bugs.
46 * None of the E1AP-E3AP errata are visible to the user.
53 * None of the A1AP-A3AP errata are visible to the user.
60 * None of 1AP-9AP errata are visible to the normal user,
62 * This is very rare and a non-problem.
64 * 1AP. Linux maps APIC as non-cacheable
65 * 2AP. worked around in hardware
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/linux-6.14.4/include/linux/
Doverflow.h1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
10 * We need to compute the minimum and maximum values representable in a given
14 * #define type_min(T) (T)(is_signed_type(T) ? (T)1 << (8*sizeof(T)-1) : 0)
15 * #define type_max(T) (T)(is_signed_type(T) ? ((T)1 << (8*sizeof(T)-1)) - 1 : ~(T)0)
18 * undefined behaviour, and at least some versions of gcc warn about
19 * the type_max expression (but not if -fsanitize=undefined is in
20 * effect; in that case, the warning is deferred to runtime...).
22 * The slightly excessive casting in type_min is to make sure the
25 * a-feature-not-a-bug, since people shouldn't be doing arithmetic on
30 * https://mail-index.netbsd.org/tech-misc/2007/02/05/0000.html -
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Dcompiler-gcc.h1 /* SPDX-License-Identifier: GPL-2.0 */
3 #error "Please do not include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
15 * shouldn't recognize the original var, and make assumptions about it.
18 * pointer arithmetic on "objects" outside their boundaries and the
19 * gcc optimizers assume this is the case. In particular they
23 * To work around it we hide the relationship of the pointer and the object
27 * RELOC_HIDE could trash r30. The bug can be worked around by changing
28 * the inline assembly constraint from =g to =r, in this particular
47 * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
48 * confuse the stack allocation in gcc, leading to overly large stack
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Dtimecounter.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
14 #define CYCLECOUNTER_MASK(bits) (u64)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
17 * struct cyclecounter - hardware abstraction for a free running counter
18 * Provides completely state-free accessors to the underlying hardware.
20 * around quickly. Locking rules (if necessary) have to be defined
21 * by the implementor and user of specific instances of this API.
25 * subtraction of non-64-bit counters,
38 * struct timecounter - layer above a &struct cyclecounter which counts nanoseconds
40 * cycle counter wrap around. Initialize with
44 * cycle counter hardware, locking issues and reading the time
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Dkref.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * kref.h - library routines for handling generic reference counted objects
5 * Copyright (C) 2004 Greg Kroah-Hartman <[email protected]>
9 * Copyright (C) 2002-2003 Patrick Mochel <[email protected]>
10 * Copyright (C) 2002-2003 Open Source Development Labs
26 * kref_init - initialize object.
27 * @kref: object in question.
31 refcount_set(&kref->refcount, 1); in kref_init()
36 return refcount_read(&kref->refcount); in kref_read()
40 * kref_get - increment refcount for object.
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Decryptfs.h1 /* SPDX-License-Identifier: GPL-2.0 */
11 * bits from a sysfs handle in order to determine how to behave. */
27 * in-memory representations are expanded hex, so it better adapted to
28 * be passed around or referenced on the command line */
49 * For convenience, we may need to pass around the encrypted session
50 * key between kernel and userspace because the authentication token
52 * private key, instead requiring the encrypted data and returning the
75 /* Iterated-hash concatenation of salt and passphrase */
78 /* Always in expanded hex */
94 u16 version; /* 8-bit major and 8-bit minor */
/linux-6.14.4/arch/arm64/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
279 ARM 64-bit (AArch64) Linux support.
287 # required due to use of the -Zfixed-x18 flag.
290 # -Zsanitizer=shadow-call-stack flag.
300 depends on $(cc-option,-fpatchable-function-entry=2)
326 # VA_BITS - PAGE_SHIFT - 3
404 def_bool !$(as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n)
409 # https://github.com/llvm/llvm-project/commit/2a96f47c5ffca84cd774ad402cacd137f4bf45e2
412 # and this was backported to 10.2.0, 9.4.0, 8.5.0, but not earlier
445 …bool "AmpereOne: AC03_CPU_38: Certain bits in the Virtualization Translation Control Register and …
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/linux-6.14.4/Documentation/process/
D6.Followthrough.rst6 At this point, you have followed the guidelines given so far and, with the
9 developers can make is to conclude that their work is now done. In truth,
15 and, as a result, is heavily oriented toward the improvement of posted
18 standards. A failure to participate in this process is quite likely to
23 ----------------------
25 A patch of any significance will result in a number of comments from other
28 process. Life can be made much easier, though, if you keep a few things in
31 - If you have explained your patch well, reviewers will understand its
32 value and why you went to the trouble of writing it. But that value
34 like to maintain a kernel with this code in it five or ten years later?
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/linux-6.14.4/lib/
DKconfig.ubsan1 # SPDX-License-Identifier: GPL-2.0-only
10 Compile-time instrumentation is used to detect various undefined
12 Documentation/dev-tools/ubsan.rst
21 the kernel size by around 5%, due to adding all the debugging
28 trade-off.
32 when a UBSAN violation occurs. (Except on arm64 and x86, which
39 def_bool $(cc-option,-fsanitize=bounds-strict)
41 The -fsanitize=bounds-strict option is only available on GCC,
44 -fsanitize=bounds.
47 def_bool $(cc-option,-fsanitize=array-bounds)
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/linux-6.14.4/arch/powerpc/platforms/8xx/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
19 The MPC86xADS is meant to serve as a platform for s/w and h/w
20 development around the MPC86X processor families.
29 The MPC885ADS is meant to serve as a platform for s/w and h/w
30 development around the MPC885 processor family.
33 bool "Embedded Planet EP88xC (a.k.a. CWH-PPC-885XN-VE)"
39 MPC885 Evaluation System and/or the CWH-PPC-885XN-VE.
56 menu "Freescale Ethernet driver platform-specific options"
64 This enables support for second Ethernet on MPC885ADS and MPC86xADS boards.
76 Enable FEC2 to serve as 2-nd Ethernet channel. Note that SMC2
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/linux-6.14.4/tools/testing/selftests/net/packetdrill/
Dtcp_tcp_info_tcp-info-rwnd-limited.pkt1 // SPDX-License-Identifier: GPL-2.0
2 // Test rwnd limited time in tcp_info for client side.
6 // Create a socket and set it to non-blocking.
11 +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
27 // Check that rwnd limited time in tcp_info is around 0.1s.
33 // Check that rwnd limited time in tcp_info is around 0.2s.
46 // Check that rwnd limited time in tcp_info is around 0.3s
47 // and busy time is 0.3 + 0.03 (server opened small window temporarily).
/linux-6.14.4/Documentation/driver-api/usb/
Derror-codes.rst1 .. _usb-error-codes:
6 :Revised: 2004-Oct-21
8 This is the documentation of (hopefully) all possible error codes (and
13 behave the same except for transfer speed dependent behaviors and the
20 Non-USB-specific:
26 ``-ENOMEM`` no memory for allocation of internal structures
29 USB-specific:
32 ``-EBUSY`` The URB is already active.
34 ``-ENODEV`` specified USB-device or bus doesn't exist
36 ``-ENOENT`` specified interface or endpoint does not exist or
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/linux-6.14.4/Documentation/timers/
Dtimekeeping.rst2 Clock sources, Clock events, sched_clock() and delay timers
6 abstractions. It partly pertains to the drivers usually found in
7 drivers/clocksource in the kernel tree, but the code may be spread out
10 If you grep through the kernel source you will find a number of architecture-
11 specific implementations of clock sources, clockevents and several likewise
12 architecture-specific overrides of the sched_clock() function and some
17 on this timeline, providing facilities such as high-resolution timers.
18 sched_clock() is used for scheduling and timestamping, and delay timers
23 -------------
26 tells you where you are in time. For example issuing the command 'date' on
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/linux-6.14.4/tools/perf/util/
Dmutex.h1 /* SPDX-License-Identifier: GPL-2.0 */
9 * A function-like feature checking macro that is a wrapper around
10 * `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
36 /* Documents functions that acquire a lock in the body of a function, and do not release it. */
41 * and release it in the body of the function.
45 /* Documents functions that try to acquire a lock, and return success or failure. */
69 * A wrapper around the mutex implementation that allows perf to error check
76 /* A wrapper around the condition variable implementation. */
84 * Initialize the mtx struct and set the process-shared rather than default
85 * process-private attribute.
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/linux-6.14.4/Documentation/accounting/
Dtaskstats-struct.rst7 There are three different groups of fields in the struct taskstats:
9 1) Common and basic accounting fields
10 If CONFIG_TASKSTATS is set, the taskstats interface is enabled and
11 the common fields and basic accounting fields are collected for
18 and::
28 and::
34 4) Per-task and per-thread context switch count statistics
40 Future extension should add fields to the end of the taskstats struct, and
47 1) Common and basic accounting fields::
50 * TASKSTATS_VERSION, which is defined in <linux/taskstats.h>.
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/linux-6.14.4/drivers/gpu/drm/panel/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
6 Panel registration and lookup framework.
17 Y030XX067A 320x480 3.0" panel as found in the YLM RG-280M, RG-300
18 and RG-99 handheld gaming consoles.
28 in the Versatile family syscon registers.
37 NT35596 1080x1920 video mode panel as found in some Asus
46 as found in the YLM RS-97 handheld gaming console.
49 tristate "Boe BF060Y8M-AJ0 panel"
54 Say Y here if you want to enable support for Boe BF060Y8M-AJ0
55 5.99" AMOLED modules. The panel has a 1080x2160 resolution and
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/linux-6.14.4/drivers/gpu/drm/xe/
Dxe_vm_doc.h1 /* SPDX-License-Identifier: MIT */
16 * bind engine, and return a handle to the user.
19 * ------------
29 * in / out fence interface (struct drm_xe_sync) as execs which allows users to
30 * think of binds and execs as more or less the same operation.
33 * ----------
35 * DRM_XE_VM_BIND_OP_MAP - Create mapping for a BO
36 * DRM_XE_VM_BIND_OP_UNMAP - Destroy mapping for a BO / userptr
37 * DRM_XE_VM_BIND_OP_MAP_USERPTR - Create mapping for userptr
43 * and GPU to modify page tables. If a new physical page is allocated in the
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/linux-6.14.4/arch/xtensa/
DKconfig.debug1 # SPDX-License-Identifier: GPL-2.0
17 Enable this function to disable link-time optimizations.
19 values to reduce code size and remove unnecessary overhead from
20 assembler-generated 'longcall' sequences.
22 code size, and possibly execution time.
25 bool "Perform S32C1I instruction self-test at boot"
40 prints in stack traces.
43 bool "Dump user code around unhandled exception address"
45 Enable this option to display user code around PC of the unhandled
47 This may simplify finding faulting code in the absence of other
/linux-6.14.4/include/drm/display/
Ddrm_scdc_helper.h5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
8 * and/or sell copies of the Software, and to permit persons to whom the
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
40 * drm_scdc_readb - read a single byte from SCDC
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/linux-6.14.4/Documentation/mm/
Dz3fold.rst8 ratio keeping the simplicity and determinism of its predecessor.
10 The main differences between z3fold and zbud are:
13 * z3fold can hold up to 3 compressed pages in its page
14 * z3fold doesn't export any API itself and is thus intended to be used
17 To keep the determinism and simplicity, z3fold, just like zbud, always
20 compression ratio goes to around 2.7x while zbud's one is around 1.7x.
27 depend on MMU enabled and provides more predictable reclaim behavior
28 which makes it a better fit for small and response-critical systems.
/linux-6.14.4/Documentation/devicetree/bindings/phy/
Dmediatek,mt7988-xfi-tphy.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/phy/mediatek,mt7988-xfi-tphy.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MediaTek MT7988 XFI T-PHY
10 - Daniel Golle <[email protected]>
13 The MediaTek XFI SerDes T-PHY provides the physical SerDes lanes
14 used by the (10G/5G) USXGMII PCS and (1G/2.5G) LynxI PCS found in
15 MediaTek's 10G-capabale MT7988 SoC.
16 In MediaTek's SDK sources, this unit is referred to as "pextp".
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/linux-6.14.4/Documentation/devicetree/bindings/iio/
Dmount-matrix.txt2 * is the definition of +/- values practical or counterintuitive?
3 * are the definitions unambiguous and easy to follow?
13 that produce three-dimensional data in relation to the world where it is
18 defined in linear algebra.
22 and thus implying that the component should be mounted in a certain orientation
29 screen and (z) being depth, the axis perpendicular to the screen.
33 and (z) depth to be negative under the screen and positive in front of it,
36 A sensor can be mounted in any angle along the axes relative to the frame of
37 reference. This means that the sensor may be flipped upside-down, left-right,
43 to this world. When using the mounting matrix, the sensor and device orientation
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/linux-6.14.4/Documentation/devicetree/bindings/net/
Dmdio.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andrew Lunn <[email protected]>
11 - Florian Fainelli <[email protected]>
12 - Heiner Kallweit <[email protected]>
17 bus. These should follow the generic ethernet-phy.yaml document, or
22 pattern: '^mdio(-(bus|external))?(@.+|-([0-9]+))?$'
24 "#address-cells":
27 "#size-cells":
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/linux-6.14.4/tools/testing/selftests/kvm/x86/
Dvmx_nested_tsc_scaling_test.c1 // SPDX-License-Identifier: GPL-2.0-only
8 * both L1 and L2 are scaled using different ratios. For this test we scale
9 * L1 down and scale L2 up.
21 #define TSC_OFFSET_L2 ((uint64_t) -33125236320908)
33 * its expected frequency. In order to account for delays in taking the TSC
34 * measurements, a difference of 1% between the actual and the expected value
42 thresh_low = expected - tolerance; in compare_tsc_freq()
46 "TSC freq is expected to be between %"PRIu64" and %"PRIu64 in compare_tsc_freq()
50 "TSC freq is expected to be between %"PRIu64" and %"PRIu64 in compare_tsc_freq()
69 tsc_freq = tsc_end - tsc_start; in check_tsc_freq()
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/linux-6.14.4/Documentation/admin-guide/media/
Davermedia.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Avermedia DVB-T on BT878 Release Notes
12 broader and updated content about that, please check:
16 The Avermedia DVB-T
19 The Avermedia DVB-T is a budget PCI DVB card. It has 3 inputs:
23 * SVIDEO Input (Mini-DIN)
27 Frontend of the Avermedia DVB-T is a Microtune 7202D. A timely
28 post to the linux-dvb mailing list ascertained that the
30 found in the dvb-hw CVS module.
32 The DVB-T card is based around the BT878 chip which is a very
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