linux/Documentation
Linus Torvalds 6bfd2d442a Updates for the interrupt subsystem:
- Core code:
 
    - Interrupt storm detection for the lockup watchdog:
 
      Lockups which are caused by interrupt storms are not easy to debug
      because there is no information about the events which make the lockup
      detector trigger.
 
      To make this more user friendly, provide an extenstion to interrupt
      statistics which allows to take snapshots and an interface to retrieve
      the delta to the snapshot. Use this new mechanism in the watchdog code
      to do a two stage lockup analysis by taking the snapshot and printing
      the deltas for the topmost active interrupts on the second trigger.
 
      Note: This contains both the interrupt and the watchdog changes as
      the latter depend on the former obviously.
 
   - Avoid summation loops in the /proc/interrupts output and use the global
     counter when possible
 
   - Skip suspended interrupts on CPU hotplug operations to ensure that they
     are not delivered before the system resumes the device drivers when
     coming out of suspend.
 
   - On CPU hot-unplug interrupts which are affine to the outgoing CPU are
     migrated to a different CPU in the affinity mask. This can fail when
     the CPUs have no vectors left. Instead of giving up try to migrate it
     to any online CPU and thereby breaking the affinity setting in order to
     prevent a stale device interrupt which targets an offline CPU
 
   - The usual small cleanups
 
  - Driver code:
 
   - Support for the RISCV AIA MSI controller
 
   - Make the interrupt allocation for the Loongson PCH controller more
     flexible to prevent vector exhaustion
 
   - The usual set of cleanups and fixes all over the place
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Merge tag 'irq-core-2024-05-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull interrupt subsystem updates from Thomas Gleixner:
 "Core code:

   - Interrupt storm detection for the lockup watchdog:

     Lockups which are caused by interrupt storms are not easy to debug
     because there is no information about the events which make the
     lockup detector trigger.

     To make this more user friendly, provide an extenstion to interrupt
     statistics which allows to take snapshots and an interface to
     retrieve the delta to the snapshot. Use this new mechanism in the
     watchdog code to do a two stage lockup analysis by taking the
     snapshot and printing the deltas for the topmost active interrupts
     on the second trigger.

     Note: This contains both the interrupt and the watchdog changes as
     the latter depend on the former obviously.

   - Avoid summation loops in the /proc/interrupts output and use the
     global counter when possible

   - Skip suspended interrupts on CPU hotplug operations to ensure that
     they are not delivered before the system resumes the device drivers
     when coming out of suspend.

   - On CPU hot-unplug interrupts which are affine to the outgoing CPU
     are migrated to a different CPU in the affinity mask. This can fail
     when the CPUs have no vectors left. Instead of giving up try to
     migrate it to any online CPU and thereby breaking the affinity
     setting in order to prevent a stale device interrupt which targets
     an offline CPU

   - The usual small cleanups

  Driver code:

   - Support for the RISCV AIA MSI controller

   - Make the interrupt allocation for the Loongson PCH controller more
     flexible to prevent vector exhaustion

   - The usual set of cleanups and fixes all over the place"

* tag 'irq-core-2024-05-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (51 commits)
  irqchip/gic-v3-its: Remove BUG_ON in its_vpe_irq_domain_alloc
  cpuidle: Avoid explicit cpumask allocation on stack
  irqchip/sifive-plic: Avoid explicit cpumask allocation on stack
  irqchip/riscv-aplic-direct: Avoid explicit cpumask allocation on stack
  irqchip/loongson-eiointc: Avoid explicit cpumask allocation on stack
  irqchip/gic-v3-its: Avoid explicit cpumask allocation on stack
  irqchip/irq-bcm6345-l1: Avoid explicit cpumask allocation on stack
  cpumask: Introduce cpumask_first_and_and()
  irqchip/irq-brcmstb-l2: Avoid saving mask on shutdown
  genirq: Reuse irq_is_nmi()
  genirq/cpuhotplug: Retry with cpu_online_mask when migration fails
  genirq/cpuhotplug: Skip suspended interrupts when restoring affinity
  arm64: dts: st: Add interrupt parent to pinctrl on stm32mp251
  arm64: dts: st: Add exti1 and exti2 nodes on stm32mp251
  ARM: dts: stm32: List exti parent interrupts on stm32mp131
  ARM: dts: stm32: List exti parent interrupts on stm32mp151
  arm64: Kconfig.platforms: Enable STM32_EXTI for ARCH_STM32
  irqchip/stm32-exti: Mark events reserved with RIF configuration check
  irqchip/stm32-exti: Skip secure events
  irqchip/stm32-exti: Convert driver to standard PM
  ...
2024-05-14 09:47:14 -07:00
..
ABI blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW 2024-05-09 09:44:55 -06:00
accel docs/accel: correct links to mailing list archives 2024-01-23 14:45:50 -07:00
accounting
admin-guide Scheduler changes for v6.10: 2024-05-13 17:18:51 -07:00
arch - Add a tracepoint to read out LLC occupancy of resource monitor IDs with the 2024-05-14 09:04:37 -07:00
block
bpf bpf, docs: Rename legacy conformance group to packet 2024-03-04 14:31:06 +01:00
cdrom
core-api Another not-too-busy cycle for documentation, including: 2024-05-13 10:51:53 -07:00
cpu-freq
crypto
dev-tools kcsan: Introduce __data_racy type qualifier 2024-05-13 10:13:39 -07:00
devicetree Updates for the interrupt subsystem: 2024-05-14 09:47:14 -07:00
doc-guide doc: fix spelling about ReStructured Text 2024-04-02 10:07:51 -06:00
driver-api This update includes the following changes: 2024-05-13 14:53:05 -07:00
fault-injection Fixed case issue with 'fault-injection' in documentation 2024-02-21 13:44:21 -07:00
fb
features membarrier: riscv: Provide core serializing command 2024-02-15 08:04:14 -08:00
filesystems Another not-too-busy cycle for documentation, including: 2024-05-13 10:51:53 -07:00
firmware_class
firmware-guide More ACPI updates for 6.9-rc1 2024-03-19 11:15:14 -07:00
fpga
gpu drm-misc-next for v6.9: 2024-02-26 09:51:49 +01:00
hid
hwmon hwmon: (aspeed-g6-pwm-tacho): Support for ASPEED g6 PWM/Fan tach 2024-03-07 10:50:16 -08:00
i2c Documentation: i2c: Document that client auto-detection is a legacy mechanism 2024-03-07 09:42:09 +01:00
iio docs: iio: add documentation for adis16475 driver 2024-02-28 19:26:36 +00:00
images
infiniband
input
isdn
kbuild Documentation/llvm: Note s390 LLVM=1 support with LLVM 18.1.0 and newer 2024-03-31 21:09:50 +09:00
kernel-hacking
leds
litmus-tests Documentation/litmus-tests: Make cmpxchg() tests safe for klitmus 2024-05-06 14:29:21 -07:00
livepatch
locking
maintainer docs: maintainer: add existing SoC and netdev profiles 2024-02-05 10:05:57 -07:00
mhi
misc-devices dt-bindings: misc: xlnx,sd-fec: convert bindings to yaml 2024-02-04 19:49:51 -06:00
mm Another not-too-busy cycle for documentation, including: 2024-05-13 10:51:53 -07:00
netlabel
netlink netlink: specs: Add missing bridge linkinfo attrs 2024-05-06 19:06:07 -07:00
networking Documentation: Add documentation for eswitch attribute 2024-03-28 18:20:08 -07:00
nvdimm
nvme
PCI
pcmcia
peci
power Documentation: power: Fix typo in suspend and interrupts doc 2024-03-13 20:51:11 +01:00
process Update the -tip maintainers merge policy document wrt. merge window timing. 2024-05-13 17:33:48 -07:00
RCU doc: Remove references to arrayRCU.rst 2024-04-09 15:13:05 +02:00
rust Rust changes for v6.10 2024-05-13 15:13:54 -07:00
scheduler Linux 6.9-rc1 2024-03-25 11:32:29 +01:00
scsi
security Another not-too-busy cycle for documentation, including: 2024-05-13 10:51:53 -07:00
sound ALSA: doc: Use DEFINE_SIMPLE_DEV_PM_OPS() 2024-02-12 11:50:26 +01:00
sphinx docs: kernel_include.py: Cope with docutils 0.21 2024-05-02 09:50:59 -06:00
sphinx-static
spi spi: docs: spidev: fix echo command format 2024-03-19 18:37:55 +00:00
staging docs: staging: fix typo in docs 2024-02-08 15:38:21 -07:00
target
tee Documentation: tee: Add TS-TEE driver 2024-04-03 14:03:09 +02:00
timers sched/isolation: Prevent boot crash when the boot CPU is nohz_full 2024-04-28 10:07:12 +02:00
tools tools/rtla: Add -U/--user-load option to timerlat 2024-03-20 05:39:06 +01:00
trace Documentation: tracing: Fix spelling mistakes 2024-05-07 08:00:25 -06:00
translations Scheduler changes for v6.10: 2024-05-13 17:18:51 -07:00
usb Documentation: usb: Document FunctionFS DMABUF API 2024-02-17 17:00:09 +01:00
userspace-api media updates for v6.9-rc1 2024-03-15 11:36:54 -07:00
virt Documentation: kvm/sev: clarify usage of KVM_MEMORY_ENCRYPT_OP 2024-03-18 19:03:53 -04:00
w1 w1: add UART w1 bus driver 2024-02-15 15:02:33 +01:00
watchdog
wmi platform/x86: wmi: Update documentation regarding _WED 2024-02-27 14:44:31 +02:00
.gitignore
atomic_bitops.txt
atomic_t.txt Documentation/atomic_t: Emphasize that failed atomic operations give no ordering 2024-05-06 14:29:04 -07:00
Changes
CodingStyle
conf.py docs: Restore "smart quotes" for quotes 2024-02-28 15:48:18 -07:00
docutils.conf
dontdiff
index.rst doc: fix spelling about ReStructured Text 2024-04-02 10:07:51 -06:00
Kconfig
Makefile docs: Detect variable fonts and suggest denylisting them 2024-04-10 14:10:13 -06:00
memory-barriers.txt
SubmittingPatches
subsystem-apis.rst docs: Fix subsystem APIs page so ungrouped entries have their own header 2024-01-30 14:02:32 -07:00