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dt-bindings: net: dsa: Fix documentation for qca8k #696

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dt-bindings: net: dsa: Fix documentation for qca8k #696

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tiagogaspar8
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Add missing Less than an Greater than signs in the examples.

Add missing Less than an Greater than in the examples.
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gatieme pushed a commit to gatieme/linux that referenced this pull request Nov 24, 2022
…_expel()

ANBZ: torvalds#696

The performence of online task regressed because of update_rq_on_expel()
and __update_rq_on_expel() are not inlined in the compilation phase,
althrogh they have the attribute "inline".

And this patch is to fix this problem.

Here follows the test scenario and test result:

Online task: Floating-point number arithmetic task with 3 threads,
	calculating the square root from 1 to 400000000, and the bvt
	of its cgroup is 2.
Offline task: stress-ng -c $nr_cpus -l 70, and the bvt of its cgroup
	is -1.

1. Only online task running, online task performence:
quantile 0.5:  3.8557952085e+09 ns
quantile 0.90:  3.8581308506e+09 ns
quantile 0.95:  3.8589838853e+09 ns
quantile 0.99:  3.860188924e+09 ns

2. Online task + offline task before applying this patch, online task
performence:
quantile 0.5:  3.9636566725e+09 ns
quantile 0.90:  4.0008950969e+09 ns
quantile 0.95:  4.0098206868e+09 ns
quantile 0.99:  4.196525352e+09 ns

3. Online task + offline task after applying this patch, online task
performence:
quantile 0.5:  3.8602548115e+09 ns
quantile 0.90:  3.8633850429e+09 ns
quantile 0.95:  3.8649974241e+09 ns
quantile 0.99:  3.869420975e+09 ns

This patch meets our expection.

Fixes: 1d45c19 ("sched: make ID_LOOSE_EXPEL defined with CONFIG_GROUP_IDENTITY on")
Signed-off-by: Cruz Zhao <[email protected]>
Acked-by: Michael Wang <[email protected]>
jimc added a commit to jimc/linux that referenced this pull request Jan 10, 2023
__jump_label_patch currently will "crash the box" if it finds a
jump_entry not as expected.  ISTM this overly harsh; it doesn't
distinguish between "alternate/opposite" state, and truly
"insane/corrupted".

The "opposite" (but well-formed) state is a milder mis-initialization
problem, and some less severe mitigation is practical ?  ATM this just
warns about it, obviously an range/enum of outcomes: warn, crash,
silence, correct, etc are possible, if warranted.

Ive managed to create this mis-initialization condition with
test_dynamic_debug.ko & _submod.ko.  This is definitely a useage bug,
but crashing the box over a similar (undiscovered) bug seems severe.

:#> echo 1 > /sys/module/test_dynamic_debug/parameters/p_disjoint_bits
[  235.258452] dyndbg: bits:0x1 > *.p_disjoint_bits
[  235.258908] dyndbg: apply bitmap: 0x1 to: 0x4f for '*'
[  235.259351] dyndbg: query 0: "class D2_DRIVER -p" mod:*
[  235.259799] dyndbg: split into words: "class" "D2_DRIVER" "-p"
[  235.260290] dyndbg: op='-' flags=0x0 maskp=0xfffffffe
[  235.260720] dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=D2_DRIVER
[  235.261418] dyndbg: good-class: test_dynamic_debug.D2_DRIVER module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[  235.262276] dyndbg: class-ref: test_dynamic_debug_submod.D2_DRIVER module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[  235.263178] jump_label: found alternate op at do_cats+0x16/0x180 [test_dynamic_debug_submod] [00000000ba944cc2] (0f 1f 44 00 00 != e9 e1 00 00 00)) size:5 type:0
[  235.264431] dyndbg: processed 1 queries, with 2 matches, 0 errs
[  235.264951] dyndbg: bit_1: 2 matches on class: D2_DRIVER -> 0x1
[  235.265444] dyndbg: query 0: "class D2_KMS -p" mod:*
[  235.265869] dyndbg: split into words: "class" "D2_KMS" "-p"
[  235.266337] dyndbg: op='-' flags=0x0 maskp=0xfffffffe
[  235.266767] dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=D2_KMS
[  235.267432] dyndbg: good-class: test_dynamic_debug.D2_KMS module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[  235.268264] dyndbg: class-ref: test_dynamic_debug_submod.D2_KMS module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[  235.269142] jump_label: found alternate op at do_cats+0x1b/0x180 [test_dynamic_debug_submod] [00000000e8d6c160] (0f 1f 44 00 00 != e9 c4 00 00 00)) size:5 type:0
[  235.270384] dyndbg: processed 1 queries, with 2 matches, 0 errs

RFC:

Ive hit this case a few times, but havent been able to isolate the
when and why.

warn-only is something of a punt, and I'm still left with remaining
bugs which are likely related; I'm able to toggle the p-flag on
callsites in the submod, but their enablement still doesn't yield
logging activity.

CC: Jason Baron <[email protected]>
CC: Peter Zijlstra <[email protected]>
Signed-off-by: Jim Cromie <[email protected]>
---

heres the Fatal kernel bug: (its on a -dirty kernel)

[ 2831.639643] dyndbg: good-class: test_dynamic_debug.D2_CORE module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[ 2831.641316] dyndbg: class-ref: test_dynamic_debug_submod.D2_CORE module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[ 2831.642048] jump_label: Fatal kernel bug, unexpected op at do_cats+0x11/0x180 [test_dynamic_debug_submod] [00000000fa724232] (0f 1f 44 00 00 != e9 fe 00 00 00)) size:5 type:0
[ 2831.643077] ------------[ cut here ]------------
[ 2831.643537] kernel BUG at arch/x86/kernel/jump_label.c:73!
[ 2831.643902] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 2831.644248] CPU: 1 PID: 425 Comm: bash Tainted: G            E      6.1.0-tf2-00021-gbe37efe8728f-dirty torvalds#696
[ 2831.644862] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014
[ 2831.645431] RIP: 0010:__jump_label_patch.cold+0x24/0x26
[ 2831.645773] Code: 83 e9 ef 00 ac fe 48 c7 c3 20 4c 5c 85 41 56 45 89 f9 49 89 d8 4c 89 e9 4c 89 ea 4c 89 ee 48 c7 c7 00 70 c5 82 e8 d7 1a 01 00 <0f> 0b 41 54 45 31 e4 55 48 89 fd 53 bb 00 00 00 80 48 81 c3 00 20
[ 2831.646896] RSP: 0018:ffffc9000101f738 EFLAGS: 00010282
[ 2831.647242] RAX: 00000000000000a2 RBX: ffffffff855c4c20 RCX: 0000000000000000
[ 2831.647702] RDX: 00000000000000a2 RSI: ffffffff81294fc4 RDI: fffff52000203ede
[ 2831.648155] RBP: ffffc9000101f778 R08: 0000000000000003 R09: ffffc9000101f4ff
[ 2831.648626] R10: fffff52000203e9f R11: 78656e75202c756a R12: ffffffff855c4c20
[ 2831.649096] R13: ffffffffc0250011 R14: 0000000000000000 R15: 0000000000000005
[ 2831.649498] FS:  00007fe4014aa740(0000) GS:ffff88805ae00000(0000) knlGS:0000000000000000
[ 2831.649894] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2831.650175] CR2: 00007f9c326e6c08 CR3: 000000000ff59000 CR4: 0000000000750ee0
[ 2831.650520] PKRU: 55555554
[ 2831.650667] Call Trace:
[ 2831.650793]  <TASK>
[ 2831.650903]  ? do_cats+0x11/0x180 [test_dynamic_debug_submod]
[ 2831.651195]  arch_jump_label_transform_queue+0x43/0xa0
[ 2831.651450]  __jump_label_update+0x9b/0x1b0
[ 2831.651670]  static_key_disable_cpuslocked+0x9f/0xd0
[ 2831.651917]  static_key_disable+0x16/0x20
[ 2831.652117]  ddebug_change+0x45d/0x5c0
jimc added a commit to jimc/linux that referenced this pull request Jan 11, 2023
__jump_label_patch currently will "crash the box" if it finds a
jump_entry not as expected.  ISTM this overly harsh; it doesn't
distinguish between "alternate/opposite" state, and truly
"insane/corrupted".

The "opposite" (but well-formed) state is a milder mis-initialization
problem, and some less severe mitigation seems practical.  ATM this
just warns about it; a range/enum of outcomes: warn, crash, silence,
ok, fixup-continue, etc, are possible on a case-by-case basis.

Ive managed to create this mis-initialization condition with
test_dynamic_debug.ko & _submod.ko.  These replicate DRM's regression
on DRM_USE_DYNAMIC_DEBUG=y; drm.debug callsites in drivers/helpers
(dependent modules) are not enabled along with those in drm.ko itself.

Heres that "opposite" state, occurring:

:#> echo 1 > /sys/module/test_dynamic_debug/parameters/p_disjoint_bits
[  235.258452] dyndbg: bits:0x1 > *.p_disjoint_bits
[  235.258908] dyndbg: apply bitmap: 0x1 to: 0x4f for '*'
[  235.259351] dyndbg: query 0: "class D2_DRIVER -p" mod:*
[  235.259799] dyndbg: split into words: "class" "D2_DRIVER" "-p"
[  235.260290] dyndbg: op='-' flags=0x0 maskp=0xfffffffe
[  235.260720] dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=D2_DRIVER
[  235.261418] dyndbg: good-class: test_dynamic_debug.D2_DRIVER module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[  235.262276] dyndbg: class-ref: test_dynamic_debug_submod.D2_DRIVER module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[  235.263178] jump_label: found alternate op at do_cats+0x16/0x180 [test_dynamic_debug_submod] [00000000ba944cc2] (0f 1f 44 00 00 != e9 e1 00 00 00)) size:5 type:0
[  235.264431] dyndbg: processed 1 queries, with 2 matches, 0 errs
[  235.264951] dyndbg: bit_1: 2 matches on class: D2_DRIVER -> 0x1
[  235.265444] dyndbg: query 0: "class D2_KMS -p" mod:*
[  235.265869] dyndbg: split into words: "class" "D2_KMS" "-p"
[  235.266337] dyndbg: op='-' flags=0x0 maskp=0xfffffffe
[  235.266767] dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=D2_KMS
[  235.267432] dyndbg: good-class: test_dynamic_debug.D2_KMS module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[  235.268264] dyndbg: class-ref: test_dynamic_debug_submod.D2_KMS module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[  235.269142] jump_label: found alternate op at do_cats+0x1b/0x180 [test_dynamic_debug_submod] [00000000e8d6c160] (0f 1f 44 00 00 != e9 c4 00 00 00)) size:5 type:0
[  235.270384] dyndbg: processed 1 queries, with 2 matches, 0 errs

RFC:

Ive hit this case a few times, but havent been able to isolate the
when and why.

warn-only is something of a punt, and I'm still left with remaining
bugs which are likely related; I'm able to toggle the p-flag on
callsites in the submod, but their enablement still doesn't yield
logging activity.

CC: Jason Baron <[email protected]>
CC: Peter Zijlstra <[email protected]>
Signed-off-by: Jim Cromie <[email protected]>
---

heres the Fatal kernel bug: (its on a -dirty kernel)

[ 2831.639643] dyndbg: good-class: test_dynamic_debug.D2_CORE module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[ 2831.641316] dyndbg: class-ref: test_dynamic_debug_submod.D2_CORE module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[ 2831.642048] jump_label: Fatal kernel bug, unexpected op at do_cats+0x11/0x180 [test_dynamic_debug_submod] [00000000fa724232] (0f 1f 44 00 00 != e9 fe 00 00 00)) size:5 type:0
[ 2831.643077] ------------[ cut here ]------------
[ 2831.643537] kernel BUG at arch/x86/kernel/jump_label.c:73!
[ 2831.643902] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 2831.644248] CPU: 1 PID: 425 Comm: bash Tainted: G            E      6.1.0-tf2-00021-gbe37efe8728f-dirty torvalds#696
[ 2831.644862] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014
[ 2831.645431] RIP: 0010:__jump_label_patch.cold+0x24/0x26
[ 2831.645773] Code: 83 e9 ef 00 ac fe 48 c7 c3 20 4c 5c 85 41 56 45 89 f9 49 89 d8 4c 89 e9 4c 89 ea 4c 89 ee 48 c7 c7 00 70 c5 82 e8 d7 1a 01 00 <0f> 0b 41 54 45 31 e4 55 48 89 fd 53 bb 00 00 00 80 48 81 c3 00 20
[ 2831.646896] RSP: 0018:ffffc9000101f738 EFLAGS: 00010282
[ 2831.647242] RAX: 00000000000000a2 RBX: ffffffff855c4c20 RCX: 0000000000000000
[ 2831.647702] RDX: 00000000000000a2 RSI: ffffffff81294fc4 RDI: fffff52000203ede
[ 2831.648155] RBP: ffffc9000101f778 R08: 0000000000000003 R09: ffffc9000101f4ff
[ 2831.648626] R10: fffff52000203e9f R11: 78656e75202c756a R12: ffffffff855c4c20
[ 2831.649096] R13: ffffffffc0250011 R14: 0000000000000000 R15: 0000000000000005
[ 2831.649498] FS:  00007fe4014aa740(0000) GS:ffff88805ae00000(0000) knlGS:0000000000000000
[ 2831.649894] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2831.650175] CR2: 00007f9c326e6c08 CR3: 000000000ff59000 CR4: 0000000000750ee0
[ 2831.650520] PKRU: 55555554
[ 2831.650667] Call Trace:
[ 2831.650793]  <TASK>
[ 2831.650903]  ? do_cats+0x11/0x180 [test_dynamic_debug_submod]
[ 2831.651195]  arch_jump_label_transform_queue+0x43/0xa0
[ 2831.651450]  __jump_label_update+0x9b/0x1b0
[ 2831.651670]  static_key_disable_cpuslocked+0x9f/0xd0
[ 2831.651917]  static_key_disable+0x16/0x20
[ 2831.652117]  ddebug_change+0x45d/0x5c0
jimc added a commit to jimc/linux that referenced this pull request Jan 17, 2023
__jump_label_patch currently will "crash the box" if it finds a
jump_entry not as expected.  ISTM this overly harsh; it doesn't
distinguish between the "alternate/toggled" state, and a truly
"insane/corrupted" one (any other value).

The "toggled" (but well-formed) state is a milder mis-initialization
problem, and a less severe mitigation seems useful.  ATM this just
warns about it; a range/enum of jump_label_patch_response: warn,
crash, silence, ok, once, fixup-continue, etc, are maybe useful case
by case.

I've managed to create this mis-initialization condition with
test_dynamic_debug.ko & _submod.ko.  They replicate the scenario which
exposed the DRM_USE_DYNAMIC_DEBUG=y regression; drm.debug callsites in
drivers/helpers (dependent modules) are not enabled along with those
in drm.ko itself.

Heres the toggled state, occurring:

:#> echo 1 > /sys/module/test_dynamic_debug/parameters/p_disjoint_bits
[  235.258452] dyndbg: bits:0x1 > *.p_disjoint_bits
[  235.258908] dyndbg: apply bitmap: 0x1 to: 0x4f for '*'
[  235.259351] dyndbg: query 0: "class D2_DRIVER -p" mod:*
[  235.259799] dyndbg: split into words: "class" "D2_DRIVER" "-p"
[  235.260290] dyndbg: op='-' flags=0x0 maskp=0xfffffffe
[  235.260720] dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=D2_DRIVER
[  235.261418] dyndbg: good-class: test_dynamic_debug.D2_DRIVER module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[  235.262276] dyndbg: class-ref: test_dynamic_debug_submod.D2_DRIVER module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[  235.263178] jump_label: found toggled op at do_cats+0x16/0x180 [test_dynamic_debug_submod] [00000000ba944cc2] (0f 1f 44 00 00 != e9 e1 00 00 00)) size:5 type:0
[  235.264431] dyndbg: processed 1 queries, with 2 matches, 0 errs
[  235.264951] dyndbg: bit_1: 2 matches on class: D2_DRIVER -> 0x1
[  235.265444] dyndbg: query 0: "class D2_KMS -p" mod:*
[  235.265869] dyndbg: split into words: "class" "D2_KMS" "-p"
[  235.266337] dyndbg: op='-' flags=0x0 maskp=0xfffffffe
[  235.266767] dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=D2_KMS
[  235.267432] dyndbg: good-class: test_dynamic_debug.D2_KMS module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[  235.268264] dyndbg: class-ref: test_dynamic_debug_submod.D2_KMS module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[  235.269142] jump_label: found toggled op at do_cats+0x1b/0x180 [test_dynamic_debug_submod] [00000000e8d6c160] (0f 1f 44 00 00 != e9 c4 00 00 00)) size:5 type:0
[  235.270384] dyndbg: processed 1 queries, with 2 matches, 0 errs

The warning appears to happen just once per prdbg * modprobe cycle,
and settle out after toggling the kernel-param

so a _ONCE response

The mismatch is apparently due to some of these factors:
. test-dynamic-debug uses DEBUG, enables all prdbgs
. test-dynamic-debug-submod doesnt, all prdbgs disabled.
. 0x1 > p_disjoint_bits init doesn't match either
. p_disjoint_bits is simplified interface to all class'd prdbg callsites.
  must clear-then-set to fully force prdbg states

Ive hit this case a few times, but havent been able to isolate the
when and why.

warn-only is something of a punt, and I'm still left with remaining
bugs which are likely related; I'm able to toggle the p-flag on
callsites in the submod, but their enablement still doesn't yield
logging activity.

CC: Jason Baron <[email protected]>
CC: Peter Zijlstra <[email protected]>
Signed-off-by: Jim Cromie <[email protected]>
---

heres the Fatal kernel bug: (its on a -dirty kernel)

[ 2831.639643] dyndbg: good-class: test_dynamic_debug.D2_CORE module: test_dynamic_debug nd: 32 nc: 4 nu: 0
[ 2831.641316] dyndbg: class-ref: test_dynamic_debug_submod.D2_CORE module: test_dynamic_debug_submod nd: 32 nc: 0 nu: 4
[ 2831.642048] jump_label: Fatal kernel bug, unexpected op at do_cats+0x11/0x180 [test_dynamic_debug_submod] [00000000fa724232] (0f 1f 44 00 00 != e9 fe 00 00 00)) size:5 type:0
[ 2831.643077] ------------[ cut here ]------------
[ 2831.643537] kernel BUG at arch/x86/kernel/jump_label.c:73!
[ 2831.643902] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 2831.644248] CPU: 1 PID: 425 Comm: bash Tainted: G            E      6.1.0-tf2-00021-gbe37efe8728f-dirty torvalds#696
[ 2831.644862] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014
[ 2831.645431] RIP: 0010:__jump_label_patch.cold+0x24/0x26
[ 2831.645773] Code: 83 e9 ef 00 ac fe 48 c7 c3 20 4c 5c 85 41 56 45 89 f9 49 89 d8 4c 89 e9 4c 89 ea 4c 89 ee 48 c7 c7 00 70 c5 82 e8 d7 1a 01 00 <0f> 0b 41 54 45 31 e4 55 48 89 fd 53 bb 00 00 00 80 48 81 c3 00 20
[ 2831.646896] RSP: 0018:ffffc9000101f738 EFLAGS: 00010282
[ 2831.647242] RAX: 00000000000000a2 RBX: ffffffff855c4c20 RCX: 0000000000000000
[ 2831.647702] RDX: 00000000000000a2 RSI: ffffffff81294fc4 RDI: fffff52000203ede
[ 2831.648155] RBP: ffffc9000101f778 R08: 0000000000000003 R09: ffffc9000101f4ff
[ 2831.648626] R10: fffff52000203e9f R11: 78656e75202c756a R12: ffffffff855c4c20
[ 2831.649096] R13: ffffffffc0250011 R14: 0000000000000000 R15: 0000000000000005
[ 2831.649498] FS:  00007fe4014aa740(0000) GS:ffff88805ae00000(0000) knlGS:0000000000000000
[ 2831.649894] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2831.650175] CR2: 00007f9c326e6c08 CR3: 000000000ff59000 CR4: 0000000000750ee0
[ 2831.650520] PKRU: 55555554
[ 2831.650667] Call Trace:
[ 2831.650793]  <TASK>
[ 2831.650903]  ? do_cats+0x11/0x180 [test_dynamic_debug_submod]
[ 2831.651195]  arch_jump_label_transform_queue+0x43/0xa0
[ 2831.651450]  __jump_label_update+0x9b/0x1b0
[ 2831.651670]  static_key_disable_cpuslocked+0x9f/0xd0
[ 2831.651917]  static_key_disable+0x16/0x20
[ 2831.652117]  ddebug_change+0x45d/0x5c0
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