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/linux/fs/erofs/
H A Dxattr.c31 struct erofs_xattr_iter it; in erofs_init_inode_xattrs() local
57 * 1) it is not enough to contain erofs_xattr_ibody_header then in erofs_init_inode_xattrs()
58 * ->xattr_isize should be 0 (it means no xattr); in erofs_init_inode_xattrs()
59 * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk in erofs_init_inode_xattrs()
79 it.buf = __EROFS_BUF_INITIALIZER; in erofs_init_inode_xattrs()
80 ret = erofs_init_metabuf(&it.buf, sb, erofs_inode_in_metabox(inode)); in erofs_init_inode_xattrs()
83 it.pos = erofs_iloc(inode) + vi->inode_isize; in erofs_init_inode_xattrs()
86 it.kaddr = erofs_bread(&it.buf, it.pos, true); in erofs_init_inode_xattrs()
87 if (IS_ERR(it.kaddr)) { in erofs_init_inode_xattrs()
88 ret = PTR_ERR(it.kaddr); in erofs_init_inode_xattrs()
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/linux/tools/lib/bpf/
H A Dbtf_iter.c16 int btf_field_iter_init(struct btf_field_iter *it, struct btf_type *t, in btf_field_iter_init() argument
19 it->p = NULL; in btf_field_iter_init()
20 it->m_idx = -1; in btf_field_iter_init()
21 it->off_idx = 0; in btf_field_iter_init()
22 it->vlen = 0; in btf_field_iter_init()
32 it->desc = (struct btf_field_desc) {}; in btf_field_iter_init()
44 it->desc = (struct btf_field_desc) { 1, {offsetof(struct btf_type, type)} }; in btf_field_iter_init()
47 it->desc = (struct btf_field_desc) { in btf_field_iter_init()
54 it->desc = (struct btf_field_desc) { in btf_field_iter_init()
61 it->desc = (struct btf_field_desc) { in btf_field_iter_init()
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/linux/drivers/usb/typec/mux/
H A Dit5205.c71 struct it5205 *it = typec_switch_get_drvdata(sw); in it5205_switch_set() local
75 regmap_update_bits(it->regmap, IT5205_REG_MUXCR, in it5205_switch_set()
79 regmap_update_bits(it->regmap, IT5205_REG_MUXCR, in it5205_switch_set()
85 regmap_write(it->regmap, IT5205_REG_MUXCR, 0); in it5205_switch_set()
94 struct it5205 *it = typec_mux_get_drvdata(mux); in it5205_mux_set() local
120 return regmap_update_bits(it->regmap, IT5205_REG_MUXCR, in it5205_mux_set()
126 struct it5205 *it = data; in it5205_irq_handler() local
130 ret = regmap_read(it->regmap, IT5205_REG_ISR, &val); in it5205_irq_handler()
135 dev_warn(&it->client->dev, "Overvoltage detected!\n"); in it5205_irq_handler()
138 regmap_update_bits(it->regmap, IT5205_REG_CSBUSR, in it5205_irq_handler()
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/linux/Documentation/ABI/testing/
H A Dsysfs-class-watchdog5 It is a read only file. It contains status of the watchdog
6 device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
13 It is a read only file. It contains options of watchdog device.
19 It is a read only file. It contains firmware version of
26 It is a read only file. It contains identity string of
33 It is a read/write file. While reading, it gives '1'
35 it gives '0'. Writing a '1' to the file enables the
45 It is a read only file. It gives active/inactive status of
52 It is a read only file. It contains watchdog device's
53 internal status bits. It is equivalent to WDIOC_GETSTATUS
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/linux/Documentation/process/
H A Dmanagement-style.rst7 on who you ask) management style for the linux kernel. It's meant to
14 to do with reality. It started as a lark, but that doesn't mean that it
17 Btw, when talking about "kernel manager", it's all about the technical
24 People", and NOT read it. Burn it, it's a great symbolic gesture.
27 making it painfully obvious to the questioner that we don't have a clue
39 manager must be to make it. That's very deep and obvious, but it's not
60 It helps to realize that the key difference between a big decision and a
75 It turns out that since nobody would be stupid enough to ever really let
76 a kernel manager have huge fiscal responsibility **anyway**, it's usually
83 you made a year ago wasn't a big decision after all, since it could be
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H A Dhandling-regressions.rst8 Linux kernel development" means in practice for developers. It complements
10 user's point of view; if you never read that text, go and at least skim over it
20 * When receiving a mailed report that did not CC the list, bring it into the
72 it into the loop by sending at least a brief "Reply-all" with the list CCed;
73 try to ensure it gets CCed again in case you reply to a reply that omitted
76 * If a report submitted in a bug tracker hits your Inbox, forward or bounce it
94 Note the caret (^) before the "introduced": it tells regzbot to treat the
132 All this is expected from you and important when it comes to regression, as
151 than three weeks after the regression's culprit was identified. Ideally it
152 should be less than two. And it ought to be just a few days, if the issue is
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/linux/drivers/accessibility/speakup/
H A DKconfig8 This is the Speakup screen reader. Think of it as a
10 kernel, it can speak everything on the text console from
55 synthesizer. You can say y to build it into the kernel,
56 or m to build it as a module. See the configuration
64 synthesizer. You can say y to build it into the kernel,
65 or m to build it as a module. See the configuration
72 synthesizer. You can say y to build it into the kernel,
73 or m to build it as a module. See the configuration
80 You can say y to build it into the kernel, or m to
81 build it as a module. See the configuration help on the
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/linux/Documentation/filesystems/caching/
H A Dnetfs-api.rst63 blob into something it can use and may employ hash tables, trees or whatever to
67 A filesystem would typically have a cookie for each inode, and would acquire it
68 in iget and relinquish it when evicting the cookie.
70 Once it has a cookie, the filesystem needs to mark the cookie as being in use.
76 unuse it in file release and it needs to use the cookie around calls to
77 truncate the cookie locally. It *also* needs to use the cookie when the
78 pagecache becomes dirty and unuse it when writeback is complete. This is
79 slightly tricky, and provision is made for it.
88 actually required and it can use the fscache I/O API directly.
95 volume it wants to access::
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/linux/net/netfilter/ipvs/
H A DKconfig24 If you want to compile it in kernel, say Y. To compile it as a
60 small, otherwise you will lose performance on it. You can adapt the
62 It is good to set the table size not far less than the number of
67 less than 200x200, it is good to set the table size 32768 (2**15).
121 If you want to compile it in kernel, say Y. To compile it as a
134 If you want to compile it in kernel, say Y. To compile it as a
144 If you want to compile it in kernel, say Y. To compile it as a
154 If you want to compile it in kernel, say Y. To compile it as a
164 If you want to compile it in kernel, say Y. To compile it as a
175 If you want to compile it in kernel, say Y. To compile it as a
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/linux/Documentation/translations/it_IT/process/
H A Dprogramming-language.rst4 :Translator: Federico Vaga <federico.vaga@vaga.pv.it>
11 Il kernel è scritto nel linguaggio di programmazione C [it-c-language]_.
12 Più precisamente, il kernel viene compilato con ``gcc`` [it-gcc]_ usando
13 l'opzione ``-std=gnu11`` [it-gcc-c-dialect-options]_: il dialetto GNU
15 Linux supporta anche ``clang`` [it-clang]_, leggete la documentazione
18 Questo dialetto contiene diverse estensioni al linguaggio [it-gnu-extensions]_,
25 [it-gcc-attribute-syntax]_. Gli attributi permettono di aggiungere una semantica,
28 linguaggio stesso (come l'aggiunta di nuove parole chiave) [it-n2049]_.
46 [it-rust-language]_ abilitando l'opzione di configurazione ``CONFIG_RUST``. Il
47 codice verrà compilato usando ``rustc`` [it-rustc]_ con l'opzione
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/linux/Documentation/admin-guide/pm/
H A Dcpufreq.rst28 In some situations it is desirable or even necessary to run the program as fast
31 available). In some other cases, however, it may not be necessary to execute
33 relatively long time without utilizing it entirely may be regarded as wasteful.
34 It also may not be physically possible to maintain maximum CPU capacity for too
44 to as CPU performance scaling or CPU frequency scaling (because it involves
56 interfaces for all platforms that support CPU performance scaling. It defines
71 platform-independent form in the majority of cases, so it should be possible
79 interface it comes from and may not be easily represented in an abstract,
90 control the P-state of multiple CPUs at the same time and writing to it affects
111 It is only possible to register one scaling driver at a time, so the scaling
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H A Dsleep-states.rst21 Depending on its configuration and the capabilities of the platform it runs on,
32 referred to as S2I or S2Idle). It allows more energy to be saved relative to
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
44 deeper system suspend variants to provide reduced resume latency. It is always
55 go back to where it left off easily enough.
60 are suspended during transitions into this state. For this reason, it should
65 reduced relative to :ref:`suspend-to-idle <s2idle>` and it may be necessary to
69 option is set and the support for it is registered by the platform with the
94 platform firmware to resume the system from it. This may be the case on other
98 relative to :ref:`suspend-to-idle <s2idle>` and :ref:`standby <standby>` and it
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H A Dintel_pstate.rst18 (``CPUFreq``). It is a scaling driver for the Sandy Bridge and later
20 may not be supported. [To understand ``intel_pstate`` it is necessary to know
31 frequencies are involved in the user space interface exposed by it, so
33 (fortunately, that mapping is unambiguous). At the same time, it would not be
35 available frequencies due to the possible size of it, so the driver does not do
44 it goes back online.
46 ``intel_pstate`` is not modular, so it cannot be unloaded, which means that the
47 only way to pass early-configuration-time parameters to it is via the kernel
49 great extent. In some configurations it even is possible to unregister it via
58 active mode, it uses its own internal performance scaling governor algorithm or
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/linux/drivers/net/wireless/realtek/rtlwifi/
H A DKconfig24 If you choose to build it as a module, it will be called rtl8192ce
35 If you choose to build it as a module, it will be called rtl8192se
47 If you choose to build it as a module, it will be called rtl8192de
60 If you choose to build it as a module, it will be called rtl8723ae
73 If you choose to build it as a module, it will be called rtl8723be
84 If you choose to build it as a module, it will be called rtl8188ee
96 If you choose to build it as a module, it will be called rtl8192ee
108 If you choose to build it as a module, it will be called rtl8821ae
120 If you choose to build it as a module, it will be called rtl8192cu
132 If you choose to build it as a module, it will be called rtl8192du
/linux/drivers/misc/vmw_vmci/
H A Dvmci_route.c18 * devices. Will set the source context if it is invalid.
33 * which comes from the VMX, so we know it is coming from a in vmci_route()
50 * cannot send it to the hypervisor. It must come in vmci_route()
69 * respect it (both context and resource are invalid). in vmci_route()
72 * should set the real context here before passing it in vmci_route()
87 * If it is not from a guest but we are acting as a in vmci_route()
88 * guest, then we need to send it down to the host. in vmci_route()
99 * itself, but it will never send datagrams to in vmci_route()
116 /* Send it from local client down to the host. */ in vmci_route()
122 * Otherwise we already received it from a guest and in vmci_route()
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/linux/Documentation/fb/
H A Dmatroxfb.rst10 * It provides a nice large console (128 cols + 48 lines with 1024x768)
21 How to use it?
90 XF{68,86}_FBDev should work just fine, but it is non-accelerated. On non-intel
105 Driver contains SVGALib compatibility code. It is turned on by choosing textual
106 mode for console. You can do it at boot time by using videomode
109 Switching to another console and back fixes it. I hope that it is SVGALib's
124 it always probe for memory. Default is to use whole detected
129 configuration, you can override it by this (you cannot override
130 `off`). It is default.
131 noaccel do not use acceleration engine. It does not work on Alphas.
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/linux/Documentation/userspace-api/media/dvb/
H A Dfrontend-stat-properties.rst16 It should be noted, however, that new OFDM delivery systems like ISDB
36 - ``scale`` - Scale for the value. It can be:
39 frontend, but it was not possible to collect it (could be a
63 - ``FE_SCALE_NOT_AVAILABLE`` - it failed to measure it, or the
82 - ``FE_SCALE_NOT_AVAILABLE`` - it failed to measure it, or the
103 In order to get the BER (Bit Error Rate) measurement, it should be
108 bit count measurements. The frontend may reset it when a
113 - ``FE_SCALE_NOT_AVAILABLE`` - it failed to measure it, or the
130 It should be noted that this measurement can be smaller than the total
136 bit count measurements. The frontend may reset it when a
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/linux/Documentation/security/keys/
H A Drequest-key.rst46 does not need to link the key to a keyring to prevent it from being immediately
48 it's up to the caller to destroy the key.
50 The request_key_tag() call is like the in-kernel request_key(), except that it
59 The request_key_rcu() call is like the request_key_tag() call, except that it
82 a suitable key there. If there is, it returns the key. If there isn't,
86 3) request_key() sees that A doesn't have the desired key yet, so it creates
104 Kerberos TGT key). It just requests the appropriate key, and the keyring
107 This will permit it to then search the keyrings of process A with the
108 UID, GID, groups and security info of process A as if it was process A,
111 8) The program then does what it must to get the data with which to
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/linux/Documentation/filesystems/xfs/
H A Dxfs-self-describing-metadata.rst14 adequate for supporting PB scale filesystems with billions of inodes, however it
24 For example, it is entirely possible to manually use xfs_db and a bit of
26 determine the root cause of a corruption problem, but it is still mainly a
28 weren't the ultimate cause of a corruption event. It may take a few hours to a
44 magic number in the metadata block, we have no other way of identifying what it
45 is supposed to be. We can't even identify if it is the right place. Put simply,
46 you can't look at a single metadata block in isolation and say "yes, it is
54 went wrong, but it is impossible to tell what order the blocks were linked into
74 numbers in the metadata objects. That is, if it has the current magic number,
75 the metadata isn't self identifying. If it contains a new magic number, it is
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/linux/Documentation/filesystems/
H A Dporting.rst64 informative error value to report). Call it foo_fill_super(). Now declare::
95 it by internal locking (most of filesystems couldn't care less) - you
104 and ->readdir() are called without BKL now. Grab it on entry, drop upon return
115 individual fs sb_op functions. If you don't need it, remove it.
122 free to drop it...
136 an existing filesystem, set it according to ->fs_flags::
142 FS_LITTER is gone - just remove it from fs_flags.
149 went in - and hadn't been documented ;-/). Just remove it from fs_flags
169 Briefly it allows for the definition of decode_fh and encode_fh operations
174 It is planned that this will be required for exporting once the code
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H A Dconfigfs.rst22 is discovered) and it is registered with sysfs. Its attributes then
24 readdir(3)/read(2). It may allow some attributes to be modified via
30 mkdir(2). It is destroyed via rmdir(2). The attributes appear at
44 it by doing::
50 subsystems. Once a client subsystem is loaded, it will appear as a
73 write_bin_attribute method will be invoked on the final close, therefore it is
79 When an item needs to be destroyed, remove it with rmdir(2). An
80 item cannot be destroyed if any other item has a link to it (via
87 access remote block devices. Call it FakeNBD. FakeNBD uses configfs
90 the driver about it. Here's where configfs comes in.
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/linux/Documentation/driver-api/usb/
H A Dpersist.rst20 required to behave as though the device has been unplugged. It's a
23 device is still attached or perhaps it was removed and a different
29 though they had disconnected. This is always safe and it is the
35 system woke up, who cares? It'll still work the same when you type on
36 it.
52 it's as though you had unplugged all the USB devices. Yes, it's
64 the system can't be suspended at all. (All right, it _can_ be
65 suspended -- but it will crash as soon as it wakes up, which isn't
72 The kernel includes a feature called USB-persist. It tries to work
76 It works like this. If the kernel sees that a USB host controller is
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/linux/Documentation/power/
H A Dswsusp.rst21 it may cause some problems, too. If you change kernel command line
22 between suspend and resume, it may do something wrong. If you change
23 your hardware while system is suspended... well, it was not good idea;
24 but it will probably only crash.
26 ( ) suspend/resume support is needed to make it safe.
36 line or specify it using /sys/power/resume.
40 resume_offset=<number> on the kernel command line or specify it
52 to RAM (provided your platform supports it), you can try::
66 before suspend (it is limited to around 2/5 of available RAM by default).
69 if found, it then checks the contents for the hibernation image signature.
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/linux/net/netfilter/
H A DKconfig93 Address Translation. It can also be used to enhance packet
96 To compile it as a module, choose M here. If unsure, say N.
103 It supports IPv4, IPV6, ARP and common transport protocols such
183 the flow-stop time (once it has been destroyed) via Connection
192 to connection tracking entries. It can be used with xtables connlabel
236 To compile it as a module, choose M here. If unsure, say N.
248 To compile it as a module, choose M here. If unsure, say N.
256 important VoIP protocols, it is widely used by voice hardware and
268 To compile it as a module, choose M here. If unsure, say N.
283 To compile it as a module, choose M here. If unsure, say N.
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/linux/tools/testing/ktest/
H A Dsample.conf6 # called "ktest.conf", but you can name it anything you like and specify
28 # to it followed by the number of times you want that test
75 # DEFAULTS tag and add it to the second. Be careful, options
89 # been defined previously. It will only override options that
105 # otherwise if it evaluates to zero, it will act the same
146 # It returns true if the given config variable or option has been defined
279 # typing it again in that option you can simply use the option
436 # it sends the mail if "$FOO" format is used. If "${FOO}" format is used,
457 # It is possible that the log may be very large, in which case,
469 # This is a label and not really an option (it takes no value).
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