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/linux/Documentation/admin-guide/mm/
H A Duserfaultfd.rst8 Userfaults allow the implementation of on-demand paging from userland
38 Vmas are not suitable for page- (or hugepage) granular fault tracking
48 is a corner case that would currently return ``-EBUSY``).
54 ----------------------
63 - Any user can always create a userfaultfd which traps userspace page faults
67 - In order to also trap kernel page faults for the address space, either the
84 --------------------------
101 - The ``UFFD_FEATURE_EVENT_*`` flags indicate that various other events
103 detail below in the `Non-cooperative userfaultfd`_ section.
105 - ``UFFD_FEATURE_MISSING_HUGETLBFS`` and ``UFFD_FEATURE_MISSING_SHMEM``
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/linux/include/linux/
H A Dlivepatch.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * livepatch.h - Kernel Live Patching Core
21 #define KLP_TRANSITION_IDLE -1
26 * struct klp_func - function structure for live patching
83 * struct klp_callbacks - pre/post live-(un)patch callback structure
88 * @post_unpatch_enabled: flag indicating if post-unpatch callback
91 * All callbacks are optional. Only the pre-patch callback, if provided,
93 * patch for any reason, including a non-zero error status returned from
94 * the pre-patch callback, no further callbacks will be executed.
105 * struct klp_object - kernel object structure for live patching
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/linux/arch/arm64/include/uapi/asm/
H A Dsigcontext.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
25 * Signal context structure - contains all info to do with the state
53 * New records that can exceed this space need to be opt-in for userspace, so
63 * and be 16-byte aligned. The last structure must be a dummy one with the
85 * Note: similarly to all other integer fields, each V-register is stored in an
86 * endianness-dependent format, with the byte at offset i from the start of the
87 * in-memory representation of the register value containing
89 * bits [(7 + 8 * i) : (8 * i)] of the register on little-endian hosts; or
90 * bits [(127 - 8 * i) : (120 - 8 * i)] on big-endian hosts.
126 * 16-byte aligned address immediately after the terminating null
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/linux/drivers/gpu/drm/xlnx/
H A Dzynqmp_disp.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2017 - 2020 Xilinx, Inc.
8 * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
9 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
19 #include <linux/dma-mapping.h>
21 #include <linux/media-bus-format.h>
34 * --------
39 * +------------------------------------------------------------+
40 * +--------+ | +----------------+ +-----------+ |
41 * | DPDMA | --->| | --> | Video | Video +-------------+ |
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/linux/Documentation/bpf/
H A Dbpf_prog_run.rst1 .. SPDX-License-Identifier: GPL-2.0
16 --------
20 can be used to unit test BPF programs against user-supplied context objects, and
28 - ``BPF_PROG_TYPE_SOCKET_FILTER``
29 - ``BPF_PROG_TYPE_SCHED_CLS``
30 - ``BPF_PROG_TYPE_SCHED_ACT``
31 - ``BPF_PROG_TYPE_XDP``
32 - ``BPF_PROG_TYPE_SK_LOOKUP``
33 - ``BPF_PROG_TYPE_CGROUP_SKB``
34 - ``BPF_PROG_TYPE_LWT_IN``
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H A Dmap_cgroup_storage.rst1 .. SPDX-License-Identifier: GPL-2.0-only
8 The ``BPF_MAP_TYPE_CGROUP_STORAGE`` map type represents a local fix-sized
15 table, which performs a hash table lookups, and requires user to track live
127 per-CPU variant will have different memory regions for each CPU for each
128 storage. The non-per-CPU will have the same memory region for each storage.
130 Prior to Linux 5.9, the lifetime of a storage is precisely per-attachment, and
136 There is a one-to-one association between the map of each type (per-CPU and
137 non-per-CPU) and the BPF program during load verification time. As a result,
154 (per-CPU and non-per-CPU). A BPF program cannot use more than one
/linux/Documentation/networking/device_drivers/ethernet/amd/
H A Dpds_vfio_pci.rst1 .. SPDX-License-Identifier: GPL-2.0+
2 .. note: can be edited and viewed with /usr/bin/formiko-vim
14 The ``pds-vfio-pci`` module is a PCI driver that supports Live Migration
20 The pds-vfio-pci device is enabled via multiple configuration steps and
21 depends on the ``pds_core`` driver to create and enable SR-IOV Virtual
26 example assumes the pds_core and pds-vfio-pci modules are already
29 .. code-block:: bash
30 :name: example-setup-script
38 # Prevent non-vfio VF driver from probing the VF device
41 # Create single VF for Live Migration via pds_core
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/linux/Documentation/devicetree/bindings/display/xlnx/
H A Dxlnx,zynqmp-dpsub.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/display/xlnx/xlnx,zynqmp-dpsub.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
14 +------------------------------------------------------------+
15 +--------+ | +----------------+ +-----------+ |
16 | DPDMA | --->| | --> | Video | Video +-------------+ |
17 | 4x vid | | | | | Rendering | -+--> | | | +------+
18 | 2x aud | | | Audio/Video | --> | Pipeline | | | DisplayPort |---> | PHY0 |
19 +--------+ | | Buffer Manager | +-----------+ | | Source | | +------+
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/linux/Documentation/livepatch/
H A Dreliable-stacktrace.rst15 functions may have live state and therefore may not be safe to patch. One way
16 to identify which functions are live is to use a stacktrace.
19 functions with live state, and best-effort approaches which can be helpful for
21 to provide a *reliable* stacktrace which ensures it never omits any live
38 * The return code is non-zero to indicate that the trace is not reliable.
47 function should attempt to detect such cases and return a non-zero error
52 3. Compile-time analysis
76 --------------------------------------
99 -------------------------------
133 ----------------------------------------------
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/linux/arch/xtensa/kernel/
H A Dcoprocessor.S4 * Xtensa processor configuration-specific table of coprocessor and
11 * Copyright (C) 2003 - 2007 Tensilica Inc.
16 #include <asm/asm-offsets.h>
25 * - a task may have live coprocessors only on one CPU.
27 * - whether coprocessor context of task T is live on some CPU is
28 * denoted by T's thread_info->cpenable.
30 * - non-zero thread_info->cpenable means that thread_info->cp_owner_cpu
31 * is valid in the T's thread_info. Zero thread_info->cpenable means that
34 * - if a coprocessor context of task T is live on CPU X, only CPU X changes
35 * T's thread_info->cpenable, cp_owner_cpu and coprocessor save area.
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/linux/sound/pci/emu10k1/
H A Demu10k1_main.c1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * James Courtier-Dutton <James@superbug.co.uk>
85 if (emu->audigy) { in snd_emu10k1_voice_init()
128 { 0x0e, 0xcf }, /* Attenuation Left 0x01 = -103dB, 0xff = 24dB */
146 HCFG_MUTEBUTTONENABLE, emu->port + HCFG); in snd_emu10k1_init()
148 outl(0, emu->port + INTE); in snd_emu10k1_init()
169 if (emu->audigy) { in snd_emu10k1_init()
182 SPCS0, emu->spdif_bits[0], in snd_emu10k1_init()
183 SPCS1, emu->spdif_bits[1], in snd_emu10k1_init()
184 SPCS2, emu->spdif_bits[2], in snd_emu10k1_init()
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/linux/drivers/of/
H A Doverlay.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2012 Pantelis Antoniou <panto@antoniou-consulting.com>
27 * struct target - info about current target node as recursing through overlay
29 * @in_livetree: @np is a node in the live devicetree
33 * in the live devicetree where the overlay subtree is targeted to be grafted
35 * also recurses to the next level of the live devicetree, as long as overlay
36 * subtree node also exists in the live devicetree. When a node in the overlay
37 * subtree does not exist at the same level in the live devicetree, target->np
47 * struct fragment - info about fragment nodes in overlay expanded device tree
67 * @cset: changeset to apply fragments to live device tree
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/linux/drivers/misc/lkdtm/
H A Drodata.c1 // SPDX-License-Identifier: GPL-2.0
3 * This includes functions that are meant to live entirely in .rodata
4 * (via objcopy tricks), to validate the non-executability of .rodata.
/linux/Documentation/admin-guide/
H A Dtainted-kernels.rst2 ---------------
16 ('kernel oops') or a non-recoverable error ('kernel panic') and writes debug
30 CPU: 0 PID: 4424 Comm: insmod Tainted: P W O 4.20.0-0.rc6.fc30 #1
43 a warning occurred (``W``), and an externally-built module was loaded (``O``).
53 decode that number is the script ``tools/debugging/kernel-chktaint``, which your
54 distribution might ship as part of a package called ``linux-tools`` or
55 ``kernel-tools``; if it doesn't, you can download the script from
56 …git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/tools/debugging/kernel-chktaint>`_
57 and execute it with ``sh kernel-chktaint``, which would print something like
63 * Externally-built ('out-of-tree') module was loaded (#12)
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/linux/tools/testing/selftests/powerpc/tm/
H A Dtm-signal-context-chk-gpr.c1 // SPDX-License-Identifier: GPL-2.0-or-later
16 * speculative nature of the 'live' registers and may infer the wrong
32 #define NV_GPR_REGS 18 /* Number of non-volatile GPR registers */
33 #define R14 14 /* First non-volatile register to check in r14-r31 subset */
39 /* Test only non-volatile general purpose registers, i.e. r14-r31 */
41 /* First context will be set with these values, i.e. non-speculative */
46 -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18
53 ucontext_t *tm_ucp = ucp->uc_link; in signal_usr1()
57 fail = (ucp->uc_mcontext.gp_regs[R14 + i] != gprs[i]); in signal_usr1()
61 R14 + i, ucp->uc_mcontext.gp_regs[R14 + i], gprs[i]); in signal_usr1()
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H A Dtm-signal-context-chk-fpu.c1 // SPDX-License-Identifier: GPL-2.0-or-later
16 * speculative nature of the 'live' registers and may infer the wrong
32 #define NV_FPU_REGS 18 /* Number of non-volatile FP registers */
33 #define FPR14 14 /* First non-volatile FP register to check in f14-31 subset */
37 /* Test only non-volatile registers, i.e. 18 fpr registers from f14 to f31 */
39 /* First context will be set with these values, i.e. non-speculative */
42 -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18
51 ucontext_t *tm_ucp = ucp->uc_link; in signal_usr1()
55 fail = (ucp->uc_mcontext.fp_regs[FPR14 + i] != fps[i]); in signal_usr1()
59 FPR14 + i, ucp->uc_mcontext.fp_regs[FPR14 + i], fps[i]); in signal_usr1()
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H A Dtm-signal-context-chk-vmx.c1 // SPDX-License-Identifier: GPL-2.0-or-later
16 * speculative nature of the 'live' registers and may infer the wrong
33 #define NV_VMX_REGS 12 /* Number of non-volatile VMX registers */
34 #define VMX20 20 /* First non-volatile register to check in vr20-31 subset */
40 /* Test only non-volatile registers, i.e. 12 vmx registers from vr20 to vr31 */
42 /* First context will be set with these values, i.e. non-speculative */
50 { -1, -2, -3, -4},{ -5, -6, -7, -8},{ -9,-10,-11,-12},
51 {-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
52 {-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
53 {-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
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/linux/Documentation/trace/
H A Dftrace-uses.rst18 for live kernel patching, or for security monitoring. This document describes
48 .. code-block:: c
87 .. code-block:: c
119 .. code-block:: c
129 .. code-block:: c
152 .. code-block:: c
201 traced function), it requires setting this flag. This is what live
202 kernel patches uses. Without this flag the pt_regs->ip can not be
234 .. code-block:: c
248 Non-zero to reset all filters before applying this filter.
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/linux/fs/bcachefs/
H A Dbtree_cache.c1 // SPDX-License-Identifier: GPL-2.0
23 bc->not_freed[BCH_BTREE_CACHE_NOT_FREED_##counter]++; \
40 if (!c->btree_roots_known[0].b) in bch2_recalc_btree_reserve()
46 if (r->b) in bch2_recalc_btree_reserve()
47 reserve += min_t(unsigned, 1, r->b->c.level) * 8; in bch2_recalc_btree_reserve()
50 c->btree_cache.nr_reserve = reserve; in bch2_recalc_btree_reserve()
55 struct btree_cache *bc = container_of(list, struct btree_cache, live[list->idx]); in btree_cache_can_free()
57 size_t can_free = list->nr; in btree_cache_can_free()
58 if (!list->idx) in btree_cache_can_free()
59 can_free = max_t(ssize_t, 0, can_free - bc->nr_reserve); in btree_cache_can_free()
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/linux/sound/pci/ca0106/
H A Dca0106.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (c) 2004 James Courtier-Dutton <James@superbug.demon.co.uk>
4 * Driver CA0106 chips. e.g. Sound Blaster Audigy LS and Live 24bit
48 * Added GPIO info for SB Live 24bit.
50 * Implement support for Line-in capture on SB Live 24bit.
52 * Add support for mute control on SB Live 24bit (cards w/ SPI DAC)
73 #define IPR_MIDI_RX_B 0x00020000 /* MIDI UART-B Receive buffer non-empty */
74 #define IPR_MIDI_TX_B 0x00010000 /* MIDI UART-B Transmit buffer empty */
87 #define IPR_MIDI_RX_A 0x00000004 /* MIDI UART-A Receive buffer non-empty */
88 #define IPR_MIDI_TX_A 0x00000002 /* MIDI UART-A Transmit buffer empty */
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/linux/Documentation/arch/arm/
H A Dkernel_mode_neon.rst6 -------------
10 '-march=armv7-a -mfpu=neon -mfloat-abi=softfp'
18 ------------
25 non-preemptible section for reasons outlined below.
29 -------------------------
32 kept 'live', and is only preserved and restored when multiple tasks are
50 ----------------------------
62 the NEON registers are live. (Additional calls to kernel_neon_begin() should be
67 --------------------
69 like IEEE-754 compliant underflow handling etc. When the VFP unit needs such
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/linux/arch/sparc/vdso/
H A Dvdso-layout.lds.S3 * its virtual address, and with only one read-only segment.
22 * non-allocatable things that dangle past the end of the PT_LOAD
23 * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries
26 vvar_start = . -8192;
52 * Ideally this would live in a C file: kept in here for
53 * compatibility with x86-64.
70 * Text is well-separated from actual data: there's plenty of
90 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
/linux/Documentation/ABI/testing/
H A Dsysfs-module4 Contact: masa-korg@dsn.okisemi.com
10 Contact: masa-korg@dsn.okisemi.com
34 Beware, non-standard modes are usually not thoroughly tested by
48 Description: Show the initialization state(live, coming, going) of
58 O out-of-tree module
59 F force-loaded module
67 Contact: Xen developer discussion <xen-devel@lists.xenproject.org>
73 Users: Qubes OS (https://www.qubes-os.org)
/linux/Documentation/core-api/
H A Ddebugging-via-ohci1394.rst2 Using physical DMA provided by OHCI-1394 FireWire controllers for debugging
6 ------------
9 to the OHCI-1394 specification which defines the controller to be a PCI
12 PCI-Bus master DMA after applying filters defined by the OHCI-1394 driver.
15 ask the OHCI-1394 controller to perform read and write requests on
28 hardware such as x86, x86-64 and PowerPC.
34 Together with a early initialization of the OHCI-1394 controller for debugging,
41 -------
43 The firewire-ohci driver in drivers/firewire uses filtered physical
47 Because the firewire-ohci driver depends on the PCI enumeration to be
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/linux/mm/
H A Dmemremap.c1 // SPDX-License-Identifier: GPL-2.0
48 if (pgmap->type == MEMORY_DEVICE_FS_DAX) in devmap_managed_enable_put()
54 if (pgmap->type == MEMORY_DEVICE_FS_DAX) in devmap_managed_enable_get()
68 xa_store_range(&pgmap_array, PHYS_PFN(range->start), PHYS_PFN(range->end), in pgmap_array_delete()
75 struct range *range = &pgmap->ranges[range_id]; in pfn_first()
76 unsigned long pfn = PHYS_PFN(range->start); in pfn_first()
87 for (i = 0; i < pgmap->nr_rang in pgmap_pfn_valid()
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