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/linux/tools/bpf/bpftool/Documentation/
H A Dbpftool-map.rst1 .. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 bpftool-map
6 ---
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/linux/tools/perf/Documentation/
H A Dperf-config.txt1 perf-config(1)
5 ----
6 perf-config - Get and set variables in a configuration file.
9 --------
11 'perf config' [<file-option>] [section.name[=value] ...]
13 'perf config' [<file-option>] -l | --list
16 -----------
20 -------
22 -l::
23 --list::
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/linux/Documentation/devicetree/bindings/misc/
H A Dintel,ixp4xx-ahb-queue-manager.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/misc/intel,ixp4xx-ahb-queue-manager.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Intel IXP4xx AHB Queue Manager
11 - Linus Walleij <linusw@kernel.org>
14 The IXP4xx AHB Queue Manager maintains queues as circular buffers in
18 queues from the queue manager with foo-queue = <&qmgr N> where the
19 &qmgr is a phandle to the queue manager and N is the queue resource
20 number. The queue resources available and their specific purpose
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/linux/tools/testing/selftests/tc-testing/tc-tests/qdiscs/
H A Dfifo.json17 "matchPattern": "qdisc bfifo 1: root.*limit [0-9]+b",
38 "matchPattern": "qdisc pfifo 1: root.*limit [0-9]+p",
59 "matchPattern": "qdisc bfifo ffff: root.*limit [0-9]+b",
67 "name": "Add bfifo qdisc on egress with queue size of 3000 bytes",
88 "name": "Add pfifo qdisc on egress with queue size of 3000 packets",
123 "matchPattern": "qdisc bfifo 10000: root.*limit [0-9]+b",
170 "name": "Replace bfifo qdisc on egress with new queue size",
193 "name": "Replace pfifo qdisc on egress with new queue size",
216 "name": "Add bfifo qdisc on egress with queue size in invalid format",
226 "cmdUnderTest": "$TC qdisc add dev $DUMMY handle 1: root bfifo limit foo-bar",
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/linux/drivers/net/wireless/ath/
H A Dath.h2 * Copyright (c) 2008-2009 Atheros Communications Inc.
30 * and station state to short-circuit node lookups on rx.
119 * struct ath_ops - Register read/write operations
195 return common->ps_ops; in ath_ps_ops()
234 * enum ath_debug_level - atheros wireless debug level
237 * @ATH_DBG_QUEUE: hardware queue management
252 * used exclusively for WLAN-BT coexistence starting from
262 * modifying debug level states -- but this is typically done through a
298 if ((common)->debug_mask & ATH_DBG_##dbg_mask) \
302 #define ATH_DBG_WARN(foo, arg...) WARN(foo, arg) argument
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/linux/rust/pin-init/src/
H A Dlib.rs1 // SPDX-License-Identifier: Apache-2.0 OR MIT
3 //! Library to safely and fallibly initialize pinned `struct`s using in-place constructors.
7 //! It also allows in-place initialization of big `struct`s that would otherwise produce a stack
10 //! This library's main use-case is in [Rust-for-Linux]. Although this version can be used
13 //! There are cases when you want to in-place initialize a struct. For example when it is very big
18 //! <https://rust-for-linux.com/the-safe-pinned-initialization-problem>.
20 //! This library allows you to do in-place initialization safely.
28 …ocator_api` unstable feature]: https://doc.rust-lang.org/nightly/unstable-book/library-features/al…
30 //! The feature is enabled by default, thus by default `pin-init` will require a nightly compiler.
32 //! will require the `std` feature, because stable compilers have neither `Box` nor `Arc` in no-std
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/linux/Documentation/filesystems/
H A Dinotify.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Inotify - A Powerful yet Simple File Change Notification System
13 - Deleted obsoleted interface, just refer to manpages for user interface.
29 What is the design decision behind using an-fd-per-instance as opposed to
30 an fd-per-watch?
33 An fd-per-watch quickly consumes more file descriptors than are allowed,
35 select()-able. Yes, root can bump the per-process fd limit and yes, users
38 spaces is thus sensible. The current design is what user-space developers
41 thousand times is silly. If we can implement user-space's preferences
42 cleanly--and we can, the idr layer makes stuff like this trivial--then we
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/linux/net/sunrpc/
H A Drpc_pipe.c1 // SPDX-License-Identifier: GPL-2.0-only
72 msg = list_entry(head->next, struct rpc_pipe_msg, list); in rpc_purge_list()
73 list_del_init(&msg->list); in rpc_purge_list()
74 msg->errno = err; in rpc_purge_list()
91 spin_lock(&pipe->lock); in rpc_timeout_upcall_queue()
92 destroy_msg = pipe->ops->destroy_msg; in rpc_timeout_upcall_queue()
93 if (pipe->nreaders == 0) { in rpc_timeout_upcall_queue()
94 list_splice_init(&pipe->pipe, &free_list); in rpc_timeout_upcall_queue()
95 pipe->pipelen = 0; in rpc_timeout_upcall_queue()
97 dentry = dget(pipe->dentry); in rpc_timeout_upcall_queue()
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/linux/net/unix/
H A Dgarbage.c1 // SPDX-License-Identifier: GPL-2.0-or-later
13 * - object w/ a bit
14 * - free list
18 * - explicit stack instead of recursion
19 * - tail recurse on first born instead of immediate push/pop
20 * - we gather the stuff that should not be killed into tree
25 * - don't just push entire root set; process in place
32 * of foo to bar and vice versa. Current code chokes on that.
38 * upon the beginning and unmark non-junk ones.
56 * parents (->gc_tree).
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/linux/Documentation/networking/
H A Dsnmp_counter.rst17 .. _RFC1213 ipInReceives: https://tools.ietf.org/html/rfc1213#page-26
30 .. _RFC1213 ipInDelivers: https://tools.ietf.org/html/rfc1213#page-28
41 .. _RFC1213 ipOutRequests: https://tools.ietf.org/html/rfc1213#page-28
60 .. _Explicit Congestion Notification: https://tools.ietf.org/html/rfc3168#page-6
73 .. _RFC1213 ipInHdrErrors: https://tools.ietf.org/html/rfc1213#page-27
81 .. _RFC1213 ipInAddrErrors: https://tools.ietf.org/html/rfc1213#page-27
98 .. _RFC1213 ipInUnknownProtos: https://tools.ietf.org/html/rfc1213#page-27
111 .. _RFC1213 ipInDiscards: https://tools.ietf.org/html/rfc1213#page-28
118 .. _RFC1213 ipOutDiscards: https://tools.ietf.org/html/rfc1213#page-28
125 .. _RFC1213 ipOutNoRoutes: https://tools.ietf.org/html/rfc1213#page-29
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H A Dfilter.rst1 .. SPDX-License-Identifier: GPL-2.0
3 .. _networking-filter:
10 ------
17 ------------
24 BPF allows a user-space program to attach a filter onto any socket and
49 The biggest user of this construct might be libpcap. Issuing a high-level
50 filter command like `tcpdump -i em1 port 22` passes through the libpcap
52 via SO_ATTACH_FILTER to the kernel. `tcpdump -i em1 port 22 -ddd`
57 qdisc layer, SECCOMP-BPF (SECure COMPuting [1]_), and lots of other places
60 .. [1] Documentation/userspace-api/seccomp_filter.rst
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/linux/ipc/
H A Dmqueue.c1 // SPDX-License-Identifier: GPL-2.0
69 * Accesses to a message queue are synchronized by acquiring info->lock.
72 * - The actual wakeup of a sleeping task is performed using the wake_q
73 * framework. info->lock is already released when wake_up_q is called.
74 * - The exit codepaths after sleeping check ext_wait_queue->state without
76 * acquiring info->lock.
93 * ->state = STATE_READY (reordered)
101 * the smp_store_release() that does ->state = STATE_READY.
115 * receiver->msg = message; (reordered)
119 * 3) There is intentionally no barrier when setting current->state
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/linux/fs/ceph/
H A Dmds_client.c1 // SPDX-License-Identifier: GPL-2.0
29 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
91 ceph_decode_64_safe(p, end, info->max_bytes, bad); in parse_reply_info_quota()
92 ceph_decode_64_safe(p, end, info->max_files, bad); in parse_reply_info_quota()
96 return -EIO; in parse_reply_info_quota()
109 if (features == (u64)-1) { in parse_reply_info_in()
124 info->in = *p; in parse_reply_info_in()
126 sizeof(*info->in->fragtree.splits) * in parse_reply_info_in()
127 le32_to_cpu(info->in->fragtree.nsplits); in parse_reply_info_in()
129 ceph_decode_32_safe(p, end, info->symlink_len, bad); in parse_reply_info_in()
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/linux/Documentation/doc-guide/
H A Dsphinx.rst12 .. _Sphinx: http://www.sphinx-doc.org/
16 documentation comments, or kernel-doc comments, from source files. Usually these
18 kernel-doc comments have some special structure and formatting, but beyond that
34 :ref:`sphinx-pre-install` for further details.
42 Sphinx inside a virtual environment, using ``virtualenv-3``
50 (sphinx_latest) $ pip install -r Documentation/sphinx/requirements.txt
58 ------------
69 --------------------
80 ------------------------
89 The former was the only option for pre-6.1 kernel documentation and it
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/linux/net/ipv4/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
40 so-called IP spoofing, however it can pose problems if you use
42 than packets from that host to you) or if you operate a non-routing
52 <file:Documentation/networking/ip-sysctl.rst>.
71 address into account. Furthermore, the TOS (Type-Of-Service) field
89 equal "cost" and chooses one of them in a non-deterministi
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H A Dip_output.c1 // SPDX-License-Identifier: GPL-2.0-only
39 * silently drop skb instead of failing with -EPERM.
81 #include <linux/bpf-cgroup.h>
97 iph->check = 0; in ip_send_check()
98 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); in ip_send_check()
108 iph_set_totlen(iph, skb->le in __ip_local_out()
952 __ip_append_data(struct sock * sk,struct flowi4 * fl4,struct sk_buff_head * queue,struct inet_cork * cork,struct page_frag * pfrag,int getfrag (void * from,char * to,int offset,int len,int odd,struct sk_buff * skb),void * from,int length,int transhdrlen,unsigned int flags) __ip_append_data() argument
1398 __ip_make_skb(struct sock * sk,struct flowi4 * fl4,struct sk_buff_head * queue,struct inet_cork * cork) __ip_make_skb() argument
1535 __ip_flush_pending_frames(struct sock * sk,struct sk_buff_head * queue,struct inet_cork * cork) __ip_flush_pending_frames() argument
1559 struct sk_buff_head queue; ip_make_skb() local
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/linux/tools/testing/selftests/net/mptcp/
H A Dmptcp_connect.c1 // SPDX-License-Identifier: GPL-2.0
113 fprintf(stderr, "Usage: mptcp_connect [-6] [-c cmsg] [-f offset] [-i file] [-I num] [-j] [-l] " in die_usage()
114 "[-m mode] [-M mark] [-o option] [-p port] [-P mode] [-r num] [-R num] " in die_usage()
115 "[-s MPTCP|TCP] [-S num] [-t num] [-T num] [-w sec] connect_address\n"); in die_usage()
116 fprintf(stderr, "\t-6 use ipv6\n"); in die_usage()
117 fprintf(stderr, "\t-c cmsg -- test cmsg type <cmsg>\n"); in die_usage()
118 fprintf(stderr, "\t-f offset -- stop the I/O after receiving and sending the specified amount " in die_usage()
119 "of bytes. If there are unread bytes in the receive queue, that will cause a MPTCP " in die_usage()
122 fprintf(stderr, "\t-i file -- read the data to send from the given file instead of stdin"); in die_usage()
123 fprintf(stderr, "\t-I num -- repeat the transfer 'num' times. In listen mode accepts num " in die_usage()
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/linux/drivers/net/ethernet/nvidia/
H A Dforcedeth.c1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * engineered documentation written by Carl-Daniel Hailfinger
15 * Copyright (C) 2004 Carl-Daniel Hailfinger (invalid MAC handling, insane
50 #include <linux/dma-mapping.h>
73 #define DEV_HAS_MSI_X 0x0000080 /* device supports MSI-X */
483 * - DESC_VER_1: Original
484 * - DESC_VER_2: support for jumbo frames.
485 * - DESC_VER_3: 64-bit format.
568 /* MSI/MSI-X defines */
638 u64 tx_bytes; /* should be ifconfig->tx_bytes + 4*tx_packets */
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/linux/init/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
8 - Re-run Kconfig when the compiler is updated
13 - Ensure full rebuild when the compiler is updated
14 include/linux/compiler-version.h contains this option in the comment
16 auto-generated dependency. When the compiler is updated, syncconfig
20 def_bool $(success,test "$(cc-name)" = GCC)
24 default $(cc-version) if CC_IS_GCC
28 def_bool $(success,test "$(cc-name)" = Clang)
32 default $(cc-version) if CC_IS_CLANG
36 def_bool $(success,test "$(as-name)" = GNU)
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/linux/Documentation/
H A Dmemory-barriers.txt19 documentation at tools/memory-model/. Nevertheless, even this memory
37 Note also that it is possible that a barrier may be a no-op for an
48 - Device operations.
49 - Guarantees.
53 - Varieties of memory barrier.
54 - What may not be assumed about memory barriers?
55 - Address-dependency barriers (historical).
56 - Control dependencies.
57 - SMP barrier pairing.
58 - Examples of memory barrier sequences.
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/linux/fs/btrfs/
H A Dinode.c1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/blk-cgroup.h>
18 #include <linux/backing-dev.h>
39 #include "disk-io.h"
42 #include "ordered-data.h"
44 #include "tree-log.h"
50 #include "delalloc-space.h"
51 #include "block-group.h"
52 #include "space-info.h"
55 #include "inode-item.h"
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/linux/Documentation/admin-guide/
H A Dkernel-parameters.txt39 Documentation/arch/m68k/kernel-options.rst.
49 PARISC The PA-RISC architecture is enabled.
64 the Documentation/scsi/ sub-directory.
83 X86-32 X86-32, aka i386 architecture is enabled.
84 X86-64 X86-64 architecture is enabled.
85 X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64)
94 KNL Is a kernel start-up parameter.
114 force -- enable ACPI if default was off
115 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
116 off -- disable ACPI if default was on
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/linux/drivers/atm/
H A Deni.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
41 * - OAM support
42 * - fix bugs listed below
48 * - may run into JK-JK bug and deadlock
49 * - should allocate UBR channel first
50 * - buffer space allocation algorithm is stupid
53 * - doesn't support OAM cells
54 * - eni_put_free may hang if not putting memory fragments that _complete_
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/linux/Documentation/kernel-hacking/
H A Dlocking.rst37 +------------------------------------+------------------------------------+
41 +------------------------------------+------------------------------------+
43 +------------------------------------+------------------------------------+
45 +------------------------------------+------------------------------------+
47 +------------------------------------+------------------------------------+
49 +------------------------------------+------------------------------------+
51 +------------------------------------+------------------------------------+
57 +------------------------------------+------------------------------------+
61 +------------------------------------+------------------------------------+
63 +------------------------------------+------------------------------------+
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/linux/arch/x86/kernel/
H A Dalternative.c1 // SPDX-License-Identifier: GPL-2.0-only
10 #include <asm/text-patching.h>
12 #include <asm/insn-eval.h>
21 #define MAX_PATCH_LEN (255-1)
42 __setup("debug-alternative", debug_alt);
51 __setup("noreplace-smp", setup_noreplace_smp);
68 for (j = 0; j < (len) - 1; j++) \
128 void *tmp = krealloc(pages->pages, (pages->num+1) * sizeof(void *), in __its_alloc()
133 pages->pages = tmp; in __its_alloc()
134 pages->pages[pages->num++] = page; in __its_alloc()
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