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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 -
40 render-max: true
42 - name: unspec
44 -
47 -
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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 PREEMP_RT configuration, re-enables also
269 * See kmap_local_page() for details on nesting.
283 * kunmap_local - Unmap a page mapped via kmap_local_page().
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 - write memory barrier instrumentation
60 * __kcsan_rmb - read memory barrier instrumentation
65 * __kcsan_release - release barrier instrumentation
70 * kcsan_disable_current - disable KCSAN for the current context
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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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/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/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/arch/arm64/kvm/vgic/
H A Dvgic-v3-nested.c1 // SPDX-License-Identifier: GPL-2.0-only
41 return hweight16(shadow_if->lr_map & (BIT(idx) - 1)); in lr_map_idx_to_shadow_idx()
45 * Nesting GICv3 support
47 * On a non-nesting VM (only running at EL0/EL1), the host hypervisor
49 * Consequently, most of the state that is modified by the guest (by ACK-ing
50 * and EOI-ing interrupts) is synced by KVM on each entry/exit, so that we
51 * keep a semi-consistent view of the interrupts.
63 * - on L2 load: move the in-memory L1 vGIC configuration into a shadow,
64 * per-CPU data structure that is used to populate the actual LRs. This is
70 * - on L2 put: perform the inverse transformation, so that the result of L2
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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/kernel/entry/
H A Dcommon.c1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/irq-entry-common.h>
15 * exit_to_user_mode_loop - do any pending work before leaving to user space
100 * Checking for rcu_is_watching() here would prevent the nesting in irqentry_enter()
109 * TINY_RCU does not support EQS, so let the compiler eliminate in irqentry_enter()
147 * arch_irqentry_exit_need_resched - Architecture specific need resched function
/linux/kernel/rcu/
H A DKconfig.debug1 # SPDX-License-Identifier: GPL-2.0-only
3 # RCU-related debugging configuration options
19 false-positive splats, we keep it default disabled but once all
63 Note that PREEMPT_COUNT must be enabled if the preempt-disabled
64 and bh-disabled checks are to take effect, and that PREEMPT_RCU
65 must be enabled for the RCU-nesting checks to take effect.
78 log of failure/close-call rcutorture reader segments with the
88 bool "Log grace-period numbers for rcutorture failures"
93 log of failure/close-call rcutorture reader segments with the
94 corresponding grace-period sequence numbers. This information
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H A Dtasks.h1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Task-based RCU implementations.
24 * struct rcu_tasks_percpu - Per-CPU component of definition for a Tasks-RCU-like mechanism.
26 * @lock: Lock protecting per-CPU callback list.
29 * @urgent_gp: Number of additional non-laz
1633 int nesting; trc_read_check_handler() local
1670 int nesting; trc_inspect_reader() local
1875 int nesting; global() member
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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.
106 return ip->i_prev_unlinked != 0; in xfs_inode_on_unlinked_list()
111 return ip->i_forkoff > 0; in xfs_inode_has_attr_fork()
121 return &ip->i_df; in xfs_ifork_ptr()
125 return &ip->i_af; in xfs_ifork_ptr()
127 return ip->i_cowfp; in xfs_ifork_ptr()
136 return ip->i_forkoff << 3; in xfs_inode_fork_boff()
144 return XFS_LITINO(ip->i_mount); in xfs_inode_data_fork_size()
150 return XFS_LITINO(ip->i_mount) - xfs_inode_fork_boff(ip); in xfs_inode_attr_fork_size()
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/linux/arch/powerpc/include/asm/book3s/64/
H A Dkup.h1 /* SPDX-License-Identifier: GPL-2.0 */
102 * save AMR -> stack;
105 * KUAP_BLOCKED -> AMR;
108 * save IAMR -> stack;
110 * KUEP_BLOCKED ->IAMR
118 * save AMR -> stack;
120 * KUAP_BLOCKED -> AMR;
212 * thread-specific and we inherit the address space and not thread
218 if (current->thread.regs) in current_thread_amr()
219 return current->thread.regs->amr; in current_thread_amr()
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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 - 2025, Intel Corp.
29 * PARAMETERS: obj_handle - Node for the object
30 * level - Current nesting level
31 * context - Points to a init info struct
32 * return_value - Not used
62 if (node->owner_id != info->owner_id) { in acpi_ds_init_one_object()
66 info->object_count++; in acpi_ds_init_one_object()
81 info->op_region_count++; in acpi_ds_init_one_object()
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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 - 2025, 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_pathname = METHOD_NAME__INI; in acpi_ns_initialize_devices()
153 info.evaluate_info->parameters = NULL; in acpi_ns_initialize_devices()
154 info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE; in acpi_ns_initialize_devices()
170 info.evaluate_info->prefix_node = handle; in acpi_ns_initialize_devices()
171 info.evaluate_info->relative_pathname = 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 - 2025, Intel Corp.
25 * PARAMETERS: walk_list - The list that owns the walk stack
26 * op - The control Op
44 op, op->common.aml_opcode, walk_state)); in acpi_ds_exec_begin_control_op()
46 switch (op->common.aml_opcode) { in acpi_ds_exec_begin_control_op()
52 if (walk_state->control_state) { in acpi_ds_exec_begin_control_op()
53 if (walk_state->control_state->control. in acpi_ds_exec_begin_control_op()
55 (walk_state->parser_state.aml - 1)) { in acpi_ds_exec_begin_control_op()
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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/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.c2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
53 return sock && sock->ops == &l2cap_sock_ops; in l2cap_is_socket()
61 return -EINVAL; in l2cap_validate_bredr_psm()
63 /* Restrict usage of well-known PSMs */ in l2cap_validate_bredr_psm()
65 return -EACCES; in l2cap_validate_bredr_psm()
74 return -EINVAL; in l2cap_validate_le_psm()
78 return -EACCES; in l2cap_validate_le_psm()
85 struct sock *sk = sock->sk; in l2cap_sock_bind()
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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
49 * Track FPU initialization and kernel-mode usage. 'true' means the FPU is
62 if (WARN_ON_ONCE(task->flags & PF_KTHREAD)) in x86_task_fpu()
81 * - FPU is not yet initialized. This can happen only when the call is in irq_fpu_usable()
83 * - The kernel is already using the FPU, either because of explicit in irq_fpu_usable()
84 * nesting (which should never be done), or because of implicit in irq_fpu_usable()
85 * nesting when a hardirq interrupted a kernel-mode FPU section. in irq_fpu_usable()
95 * - Task context except from within fpregs_lock()'ed critical in irq_fpu_usable()
98 * - Soft interrupt processing context which cannot happen in irq_fpu_usable()
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