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/linux/Documentation/process/
H A Dmanagement-style.rst45 manage had better know the details better than you, so if they come to
51 Namely that you are in the wrong job, and that **they** should be managing
113 not. After all, if **they** aren't certain whether it's a good idea, you
114 sure as hell shouldn't encourage them by promising them that what they
115 work on will be included. Make them at least think twice before they
118 Remember: they'd better know more about the details than you do, and
119 they usually already think they have the answer to everything. The best
121 healthy dose of critical thinking on what they do.
125 clear which approach is better, they'll eventually figure it out. The
127 situation that they just give up.
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H A D6.Followthrough.rst26 developers as they review the code. Working with reviewers can be, for
42 they see the same mistakes being made over and over again. If you get a
49 be working on the kernel years from now, but they understand that their
50 employer could change. They truly are, almost without exception,
51 working toward the creation of the best kernel they can; they are not
62 you need to pay attention to the technical observations that they are
85 One fatal mistake is to ignore review comments in the hope that they will
86 go away. They will not go away. If you repost code without having
96 time; if you help them get a running start, they will be in a better mood
97 when they revisit your code.
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H A D2.Process.rst45 merge window do not come out of thin air; they have been collected, tested,
63 exception is made for drivers for previously-unsupported hardware; if they
64 touch no in-tree code, they cannot cause regressions and should be safe to
128 Some kernels are designated "long term" kernels; they will receive support
166 developers on that list reply with any comments they may have. This
182 make those changes or justify why they should not be made. If your
225 of the kernel they manage; they are the ones who will (usually) accept a
236 the patches they have selected for merging from their repositories. If
279 mailing list, or they may apply to a part of the kernel for which there is
300 lists when they are assembled; they can be downloaded from:
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H A Dvolatile-considered-harmful.rst8 changed outside of the current thread of execution; as a result, they are
10 being used. In other words, they have been known to treat volatile types
11 as a sort of easy atomic variable, which they are not. The use of volatile in
23 unwanted optimization. If they are being used properly, there will be no
38 primitives act as memory barriers - they are explicitly written to do so -
101 volatile should take a step back and think about what they are truly trying
105 they come with a justification which shows that the concurrency issues have
/linux/tools/perf/pmu-events/arch/x86/tigerlake/
H A Dfloating-point.json12 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
43 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
48 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
52 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/tools/perf/pmu-events/arch/x86/rocketlake/
H A Dfloating-point.json12 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
43 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
48 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
52 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/tools/perf/pmu-events/arch/x86/icelakex/
H A Dfloating-point.json12 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
43 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
48 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
52 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/tools/perf/pmu-events/arch/x86/icelake/
H A Dfloating-point.json12 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
43 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
48 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
52 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/Documentation/core-api/
H A Derrseq.rst39 can tell whether the value has changed since they last checked it.
54 They're all handing him work to do -- so much he can't keep track of who
56 just want to know when he's finished all of the work they've handed him so
57 far and whether he made any mistakes since they last asked.
59 He might have made the mistake on work they didn't actually hand him,
75 The supervisors come in and get an initial read for the day. They
88 Now they start handing him tasks to do. Every few minutes they ask him to
89 finish up all of the work they've handed him so far. Then they ask him
106 and they each get the error when they next check. Subsequent calls will
111 whether one was made since they last checked, and the latest value
/linux/tools/perf/pmu-events/arch/x86/broadwellx/
H A Dfloating-point.json3 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
7 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
12 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 4 calculati…
16 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 4 calculati…
25 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 8 calculati…
34 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
43 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/tools/perf/pmu-events/arch/x86/broadwellde/
H A Dfloating-point.json3 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
7 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
12 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 4 calculati…
16 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 4 calculati…
25 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 8 calculati…
34 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
43 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/tools/perf/pmu-events/arch/x86/broadwell/
H A Dfloating-point.json3 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
7 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
12 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 4 calculati…
16 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
21 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 4 calculati…
25 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
30 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 8 calculati…
34 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
43 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/tools/perf/pmu-events/arch/x86/skylakex/
H A Dfloating-point.json7 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
43 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
48 …SQRT RSQRT14 RCP14 FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
52 …SQRT RSQRT14 RCP14 FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
57 …SQRT RSQRT14 RCP14 FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
61 …SQRT RSQRT14 RCP14 FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
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/linux/tools/perf/pmu-events/arch/x86/snowridgex/
H A Duncore-memory.json472 …Q soon after they enter the memory controller, and need credits for an entry in this buffer before…
483 …Q soon after they enter the memory controller, and need credits for an entry in this buffer before…
493 …Q soon after they enter the memory controller, and need credits for an entry in this buffer before…
503 …Q soon after they enter the memory controller, and need credits for an entry in this buffer before…
513 …PQ soon after they enter the memory controller, and need credits for an entry in this buffer befor…
522 …PQ soon after they enter the memory controller, and need credits for an entry in this buffer befor…
552they enter the memory controller, and need credits for an entry in this buffer before being sent f…
563they enter the memory controller, and need credits for an entry in this buffer before being sent f…
573they enter the memory controller, and need credits for an entry in this buffer before being sent f…
583they enter the memory controller, and need credits for an entry in this buffer before being sent f…
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/linux/Documentation/locking/
H A Dspinlocks.rst39 using spinlocks they tend to expand to areas you might not have noticed
41 shared data structures **everywhere** they are used. The spinlocks are most
47 touches a shared variable has to agree about the spinlock they want
57 (rw_lock) versions of the spinlocks are sometimes useful. They allow multiple
100 The single spin-lock primitives above are by no means the only ones. They
102 but partly **because** they are safe they are also fairly slow. They are slower
103 than they'd need to be, because they do have to disable interrupts
/linux/tools/perf/pmu-events/arch/x86/cascadelakex/
H A Dfloating-point.json7 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
43 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
48 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
52 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
57 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
61 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
[all …]
/linux/Documentation/input/
H A Dgamepad.rst56 all devices have both or any, but they are present at most times.
80 bugs, if they don't.
83 the buttons from this protocol. However, they try to do this in a compatible
111 If only 2 action-buttons are present, they are reported as BTN_SOUTH and
117 If only 3 action-buttons are present, they are reported as (from left
119 If the buttons are aligned perfectly vertically, they are reported as
124 If all 4 action-buttons are present, they can be aligned in two
125 different formations. If diamond-shaped, they are reported as BTN_NORTH,
152 If analog-sticks provide digital buttons, they are mapped accordingly as
167 If only one trigger-button combination is present (upper+lower), they are
/linux/Documentation/filesystems/bcachefs/
H A DCodingStyle.rst32 are logically impossible. (Or, make them debug mode assertions if they're
76 Pretty printers are wonderful, because they compose and you can use them
78 make your error messages much easier to write (therefore they will actually
79 exist) and much more informative. And they can be used from sysfs/debugfs, as
90 Tracepoints shouldn't be the first thing you reach for. They're an important
97 The humble counter is an incredibly useful tool. They're cheap and simple to
112 a user waiting. They'll thank you in the long run, and when they understand
113 what you're doing you'll be amazed at how patient they're happy to be. Users
114 like to help - otherwise they wouldn't be reporting the bug in the first place.
141 existing code. Sometimes these can be the best projects, because they can lead
/linux/arch/hexagon/include/asm/
H A Dtlbflush.h16 * ones from smp.c, else they are some local flavors.
36 * The VM kernel doesn't walk page tables, and they are passed to the VMM
37 * by logical address. There doesn't seem to be any possibility that they
39 * they would only be located by consulting the mm structure, and they
/linux/Documentation/admin-guide/pm/
H A Dstrategies.rst32 ``inactive`` (idle). If they are active, they have to be in power states
33 allowing them to process data and to be accessed by software. In turn, if they
34 are inactive, ideally, they should be in low-power states in which they may not
47 sleep states than when they are runtime idle most of the time.
/linux/tools/perf/pmu-events/arch/x86/skylake/
H A Dfloating-point.json7 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
16 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
25 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
34 …T RCP DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
39 …RCP14 RSQRT14 SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB count twice as they perform 2 calculati…
43 … SQRT DPP FM(N)ADD/SUB. DPP and FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
52 …AX SQRT RSQRT RCP FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
61 … DIV MIN MAX SQRT FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
70 …AX SQRT RSQRT RCP FM(N)ADD/SUB. FM(N)ADD/SUB instructions count twice as they perform 2 calculati…
/linux/Documentation/dev-tools/kunit/
H A Dstyle.rst8 strongly encouraged that they are named and written according to the guidelines
10 they may break some tooling, may conflict with other tests, and may not be run
23 To make tests easy to find, they are grouped into suites and subsystems. A test
42 If a test subsystem name has multiple components, they should be separated by
71 The KUnit API and tools do not explicitly know about subsystems. They are
84 Test suites are named after the subsystem they are part of. If a subsystem
89 subsystem (for example, both unit tests and integration tests), they should be
128 Tests should be named after what they are testing. This is often the name of the
130 As tests are C functions, they should be named and written in accordance with
/linux/Documentation/filesystems/
H A Didmappings.rst6 Most filesystem developers will have encountered idmappings. They are used when
76 range of the first idmapping anymore (However they are order isomorphic over
136 The kernel is mostly concerned with kernel ids. They are used when performing
156 going to be concerned with how idmappings are created nor how they are used
325 ``kuid_t`` and ``kgid_t`` the compiler will throw an error when they are
350 but they are exclusively used when determining file ownership which is why they
351 are called "filesystem ids". They are usually identical to the uid and gid of
352 the caller but can differ. We will just assume they are always identical to not
387 they can solve the problems we observed before.
576 ``chown()``. For example, they could change ownership so that ``dir`` and all
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/linux/drivers/gpu/drm/i915/
H A Di915_priolist_types.h32 * another context. They get scheduled with their default priority and
33 * once they reach the execlist ports we ensure that they stick on the
34 * HW until finished by pretending that they have maximum priority,
/linux/Documentation/driver-api/acpi/
H A Dscan_handlers.rst19 acpi_device objects are referred to as "device nodes" in what follows, but they
29 appropriate data, but some of them require additional handling after they have
38 basis of the device node's hardware ID (HID). They are performed by objects
73 scope (if they have scan handlers). Next, it unregisters all of the device
79 is the order in which they are matched against device nodes during namespace
83 first time and they cannot be removed from it.

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