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/linux/Documentation/userspace-api/
H A Diommufd.rst1 .. SPDX-License-Identifier: GPL-2.0+
19 At minimum iommufd provides universal support of managing I/O address spaces and
20 I/O page tables for all IOMMUs, with room in the design to add non-generic
31 --------------------
35 - IOMMUFD_OBJ_IOAS, representing an I/O address space (IOAS), allowing map/unmap
41 - IOMMUFD_OBJ_DEVICE, representing a device that is bound to iommufd by an
44 - IOMMUFD_OBJ_HWPT_PAGING, representing an actual hardware I/O page table
48 feature flag. This can be either an UNMANAGED stage-1 domain for a device
49 running in the user space, or a nesting parent stage-2 domain for mappings
50 from guest-level physical addresses to host-level physical addresses.
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/linux/Documentation/netlink/specs/
H A Dnet_shaper.yaml1 # SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
2 ---
3 name: net-shaper
31 support for complex scheduling hierarchy, or for some shaping
33 @cap-get operation.
36 -
38 name: max-handle-id
41 -
45 render-max: true
47 - name: unspec
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/linux/include/linux/
H A Dkcsan.h1 /* SPDX-License-Identifier: GPL-2.0 */
4 * data structures to set up runtime. See kcsan-checks.h for explicit checks and
5 * modifiers. For more info please see Documentation/dev-tools/kcsan.rst.
13 #include <linux/kcsan-checks.h>
20 * task_struct, and interrupts access internal per-CPU storage.
30 * track of nesting. Both (a) and (b) are entirely independent of each
32 * vice-versa.
41 * To support these cases, we independently track the depth of nesting
48 * Access mask for all accesses if non-zero.
58 * barriers; only keep 1 to keep fast-path complexity manageable.
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H A Dhighmem-internal.h1 /* SPDX-License-Identifier: GPL-2.0 */
6 * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
17 DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx); in kmap_assert_nomap()
261 * kunmap_atomic - Unmap the virtual address mapped by kmap_atomic() - deprecated!
264 * Unmaps an address previously mapped by kmap_atomic() and re-enables
265 * pagefaults. Depending on PREEMPT_RT configuration, re-enables also
269 * See kmap_local_page() for details on nesting
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H A Dkcsan-checks.h1 /* SPDX-License-Identifier: GPL-2.0 */
16 /* Access types -- if KCSAN_ACCESS_WRITE is not set, the access is a read. */
18 #define KCSAN_ACCESS_COMPOUND (1 << 1) /* Compounded read-write instrumentation. */
31 * __kcsan_check_access - check generic access for races
42 * memory orders to the LKMM memory orders and vice-versa!
50 * __kcsan_mb - full memory barrier instrumentation
55 * __kcsan_wmb - writ
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H A Dhighmem.h1 /* SPDX-License-Identifier: GPL-2.0 */
14 #include "highmem-internal.h"
17 * kmap - Map a page for long term usage
40 * kunmap - Unmap the virtual address mapped by kmap()
49 * kmap_to_page - Get the page for a kmap'ed address
57 * kmap_flush_unused - Flush all unused kmap mappings in order to
63 * kmap_local_page - Map a page for temporary usage
70 * Requires careful handling when nesting multiple mappings because the map
99 * kmap_local_folio - Map a page in this folio for temporary usage
103 * Requires careful handling when nesting multiple mappings because the map
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H A Duaccess.h1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/fault-inject-usercopy.h>
16 * Architectures that support memory tagging (assigning tags to memory regions,
21 * Passing down mm_struct allows to define untagging rules on per-process
24 * It's defined as noop for architectures that don't support memory tagging.
60 * already been checked (and succeeded); they should *not* zero-pad anything.
61 * No KASAN or object size checks either - thos
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/linux/Documentation/virt/kvm/x86/
H A Drunning-nested-guests.rst1 .. SPDX-License-Identifier: GPL-2.0
8 can be KVM-based or a different hypervisor). The straightforward
12 .----------------. .----------------.
17 |----------------'--'----------------|
22 .------------------------------------------------------.
25 |------------------------------------------------------|
27 '------------------------------------------------------'
31 - L0 – level-0; the bare metal host, running KVM
33 - L1 – level-1 guest; a VM running on L0; also called the "guest
36 - L2 – level-2 guest; a VM running on L1, this is the "nested guest"
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/linux/Documentation/bpf/
H A Dmap_of_maps.rst1 .. SPDX-License-Identifier: GPL-2.0-only
9 - ``BPF_MAP_TYPE_ARRAY_OF_MAPS`` and ``BPF_MAP_TYPE_HASH_OF_MAPS`` were
13 purpose support for map in map storage. One level of nesting is supported, where
15 ``array_of_maps->sock_map``.
27 - Multi-level nesting is not supported.
28 - Any BPF map type can be used as an inner map, except for
30 - A BPF program cannot update or delete outer map entries.
32 For ``BPF_MAP_TYPE_ARRAY_OF_MAPS`` the key is an unsigned 32-bit integer index
38 the max_entries limit that you specify. Hash maps use pre-allocation of hash
40 pre-allocation when it is too memory expensive.
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/linux/tools/testing/selftests/drivers/net/
H A Dshaper.py2 # SPDX-License-Identifier: GPL-2.0
13 def get_shapers(cfg, nl_shaper) -> None:
24 def get_caps(cfg, nl_shaper) -> None:
32 # Each device implementing shaper support must support some
36 def set_qshapers(cfg, nl_shaper) -> None:
44 if not 'support-bw-max' in caps or not 'support-metric-bps' in caps:
45 raise KsftSkipEx("device does not support queue scope shapers with bw_max and metric bps")
49 channels = netnl.channels_get({'header': {'dev-index': cfg.ifindex}})
50 if channels['combined-count'] == 0:
52 cfg.nr_queues = channels['rx-count']
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/linux/Documentation/networking/
H A Dopenvswitch.rst1 .. SPDX-License-Identifier: GPL-2.0
8 flow-level packet processing on selected network devices. It can be
10 VLAN processing, network access control, flow-based network control,
26 packets of the same type entirely in-kernel).
30 ----------------------
36 might even be desirable, someday, to drop support for parsing
41 To support this forward and backward compatibility, whenever the
45 kernel-provided version:
47 - If userspace's notion of the flow key for the packet matches the
50 - If the kernel's flow key includes more fields than the userspace
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/linux/Documentation/userspace-api/netlink/
H A Dgenetlink-legacy.rst1 .. SPDX-License-Identifier: BSD-3-Clause
4 Netlink specification support for legacy Generic Netlink families
9 the ``genetlink-legacy`` protocol level.
15 -------
29 --------------------
31 New Netlink families should use ``multi-attr`` to define arrays.
35 For reference the ``multi-attr`` array may look like this::
37 [ARRAY-ATTR]
41 [SOME-OTHER-ATTR]
42 [ARRAY-ATTR]
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/linux/kernel/locking/
H A Dqspinlock.c1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P.
6 * (C) Copyright 2013-2014,2018 Red Hat, Inc.
8 * (C) Copyright 2015 Hewlett-Packard Enterprise Development LP
34 * The basic principle of a queue-base
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/linux/fs/xfs/
H A Dxfs_inode.h1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
105 return ip->i_prev_unlinked != 0; in xfs_inode_on_unlinked_list()
110 return ip->i_forkoff > 0; in xfs_inode_has_attr_fork()
120 return &ip->i_df; in xfs_ifork_ptr()
124 return &ip->i_af; in xfs_ifork_ptr()
126 return ip->i_cowfp; in xfs_ifork_ptr()
135 return ip->i_forkof in xfs_inode_fork_boff()
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/linux/Documentation/RCU/Design/Data-Structures/
H A DData-Structures.rst15 Data-Structure Relationships
25 .. kernel-figure:: BigTreeClassicRCU.svg
34 which results in a three-level ``rcu_node`` tree.
38 The purpose of this combining tree is to allow per-CPU events
39 such as quiescent states, dyntick-idle transitions,
42 Quiescent states are recorded by the per-CPU ``rcu_data`` structures,
43 and other events are recorded by the leaf-level ``rcu_node``
54 As can be seen from the diagram, on a 64-bit system
55 a two-level tree with 64 leaves can accommodate 1,024 CPUs, with a fanout
58 +-----------------------------------------------------------------------+
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/linux/drivers/acpi/acpica/
H A Ddsinit.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: dsinit - Object initialization namespace walk
6 * Copyright (C) 2000 - 2026, Intel Corp.
29 * PARAMETERS: obj_handle - Node for the object
30 * level - Current nesting leve
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H A Dutownerid.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: utownerid - Support for Table/Method Owner IDs
19 * PARAMETERS: owner_id - Where the new owner ID is returned
114 * If this error happens, there may be very deep nesting of invoked in acpi_ut_allocate_owner_id()
130 * PARAMETERS: owner_id_ptr - Pointer to a previously allocated owner_ID
136 * DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
169 owner_id--; in acpi_ut_release_owner_id()
182 "Attempted release of non-allocated OwnerId: 0x%3.3X", in acpi_ut_release_owner_id()
H A Dnsinit.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: nsinit - namespace initialization
6 * Copyright (C) 2000 - 2026, Intel Corp.
148 * This support is provided for Windows compatibility (Vista+) and in acpi_ns_initialize_devices()
151 info.evaluate_info->prefix_node = acpi_gbl_root_node; in acpi_ns_initialize_devices()
152 info.evaluate_info->relative_pathnam in acpi_ns_initialize_devices()
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H A Ddscontrol.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: dscontrol - Support for execution control opcodes -
7 * Copyright (C) 2000 - 2026, Intel Corp.
25 * PARAMETERS: walk_list - Th
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/linux/scripts/
H A Dunifdef.c2 * Copyright (c) 2002 - 2011 Tony Finch <dot@dotat.at>
27 * unifdef - remove ifdef'ed lines
30 * It was rewritten to support ANSI C by Tony Finch. The original version
31 * of unifdef carried the 4-clause BSD copyright licence. None of its code
60 "@(#) $Version: unifdef-2.5 $\n"
99 IS_TRUE_PREFIX, /* first non-false #(el)if is true */
100 IS_PASS_MIDDLE, /* first non-false #(el)if is unknown */
122 STARTING_COMMENT, /* just after slash-backslash-newline */
123 FINISHING_COMMENT, /* star-backslash-newline in a C comment */
146 #define MAXDEPTH 64 /* maximum #if nesting */
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/linux/net/bluetooth/
H A Dl2cap_sock.c1 // SPDX-License-Identifier: GPL-2.0
3 BlueZ - Bluetooth protocol stack for Linux
4 Copyright (C) 2000-2001 Qualcomm Incorporated
5 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
51 return sock && sock->ops == &l2cap_sock_ops; in l2cap_is_socket()
59 return -EINVAL; in l2cap_validate_bredr_psm()
61 /* Restrict usage of well-known PSMs */ in l2cap_validate_bredr_psm()
63 return -EACCE in l2cap_validate_bredr_psm()
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/linux/arch/x86/include/asm/
H A Dnospec-branch.h1 /* SPDX-License-Identifier: GPL-2.0 */
12 #include <asm/msr-index.h>
77 #include <asm/asm-offsets.h>
80 movq $-1, PER_CPU_VAR(__x86_call_depth);
110 * This is required in various cases for retpoline and IBRS-based
118 * from C via asm(".include <asm/nospec-branch.h>") but let's not go there.
136 * Google experimented with loop-unrolling and this turned out to be
137 * the optimal version - two calls, each with their own speculation
168 * To mitigate Post-Barrier RSB speculation, one CALL instruction must be
171 * On PBRSB-vulnerable CPUs, it is not safe for a RET to be executed
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/linux/arch/x86/kernel/fpu/
H A Dcore.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Pentium III FXSR, SSE support
50 * Track FPU initialization and kernel-mode usage. 'true' means the FPU is
63 if (WARN_ON_ONCE(task->flags & PF_KTHREAD)) in x86_task_fpu()
82 * - FPU is not yet initialized. This can happen only when the call is in irq_fpu_usable()
84 * - The kernel is already using the FPU, either because of explicit in irq_fpu_usable()
85 * nesting (whic in irq_fpu_usable()
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/linux/arch/arm64/kernel/probes/
H A Dkprobes.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Kprobes support for ARM64
28 #include <asm/debug-monitors.h>
31 #include <asm/text-patching.h>
37 #include "decode-insn.h"
61 kprobe_opcode_t *addr = p->ainsn.xol_insn; in arch_prepare_ss_slot()
67 * - That the I-cache maintenance for these instructions is complete in arch_prepare_ss_slot()
69 * ensures this, but just omits causing a Context-Synchronization-Event in arch_prepare_ss_slot()
72 * - That the kprobe BRK results in an exception (and consequently a in arch_prepare_ss_slot()
73 * Context-Synchronoization-Event), which ensures that the CPU will in arch_prepare_ss_slot()
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/linux/include/linux/fs/
H A Dsuper_types.h1 /* SPDX-License-Identifier: GPL-2.0 */
13 #include <linux/percpu-rwsem.h>
48 SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
51 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
62 * enum freeze_holder - holder of the freeze
65 * @FREEZE_MAY_NEST: whether nesting freeze and thaw requests is allowed
118 * If a filesystem can support graceful removal of a device and
119 * continue read-writ
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