Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEADgrafted

Changes:

Make expedited grace periods expedite normal RCU callbacks

Miscellaneous fixes:
 * Improve diagnostic output with character task states.
 * Mark accesses to inform KCSAN of concurrency design.
 * Move from kmalloc() to kmalloc_obj().
 * Documentation updates.
 * Improve handling of RCU deferred quiescent states.
 * Clean up unused function arguments and structure fields.
 * Reduce show_rcu_gp_kthreads() stack space.

Tasks RCU updates:
 * Clean up after SRCU re-implementation of Tasks Trace RCU.
 * Mark accesses to inform KCSAN of concurrency design.
 * Add ->lazy_timer status to diagnostic output.
 * Remove an unnecessary memory barrier.
 * Fix a data race, courtesy of KCSAN.
 * Documentation updates.
 * Convert cond_resched_tasks_rcu_qs() from macro to static inline
   function.

SRCU updates:
 * Add Rust helpers for SRCU.
 * Avoid losing queued work at cleanup_srcu_struct() time.

Torture-test updates:
 * Preparation work for immediate RCU priority deboosting.
 * Test RCU readers from real interrupt handlers (as opposed to softirq).
 * Simplify code through use of cpumask_next_wrap().
 * Improve diagnostic output with character task states.
 * Add rcutorture.nwriters parameter to allow lightweight stall testing,
   and rcutorture.stall_only to make doing so easier.
 * Test an RCU Tasks Trace grace period implying an RCU grace period.
 * Make RCU Tasks Trace torturing track reader batches.
 * Fix a data race, courtesy of KCSAN.
 * Plug a shuffle_tmp_mask memory leak on kthread spawn failure.

1 files changed, 236 insertions, 0 deletions

diff --git a/tools/Makefile b/tools/Makefile
new file mode 100644
index 000000000..cb40961a7
--- /dev/null
+++ b/tools/Makefile
@@ -0,0 +1,236 @@
+# SPDX-License-Identifier: GPL-2.0
+# Some of the tools (perf) use same make variables
+# as in kernel build.
+export srctree=
+export objtree=
+
+include scripts/Makefile.include
+
+help:
+	@echo 'Possible targets:'
+	@echo ''
+	@echo '  acpi                   - ACPI tools'
+	@echo '  bpf                    - misc BPF tools'
+	@echo '  counter                - counter tools'
+	@echo '  cpupower               - a tool for all things x86 CPU power'
+	@echo '  debugging              - tools for debugging'
+	@echo '  dma                    - tools for DMA mapping'
+	@echo '  firewire               - the userspace part of nosy, an IEEE-1394 traffic sniffer'
+	@echo '  firmware               - Firmware tools'
+	@echo '  freefall               - laptop accelerometer program for disk protection'
+	@echo '  gpio                   - GPIO tools'
+	@echo '  hv                     - tools used when in Hyper-V clients'
+	@echo '  iio                    - IIO tools'
+	@echo '  intel-speed-select     - Intel Speed Select tool'
+	@echo '  kvm_stat               - top-like utility for displaying kvm statistics'
+	@echo '  leds                   - LEDs  tools'
+	@echo '  nolibc                 - nolibc headers testing and installation'
+	@echo '  objtool                - an ELF object analysis tool'
+	@echo '  perf                   - Linux performance measurement and analysis tool'
+	@echo '  selftests              - various kernel selftests'
+	@echo '  sched_ext              - sched_ext example schedulers'
+	@echo '  bootconfig             - boot config tool'
+	@echo '  spi                    - spi tools'
+	@echo '  tmon                   - thermal monitoring and tuning tool'
+	@echo '  thermometer            - temperature capture tool'
+	@echo '  thermal-engine         - thermal monitoring tool'
+	@echo '  thermal                - thermal library'
+	@echo '  tracing                - misc tracing tools'
+	@echo '  turbostat              - Intel CPU idle stats and freq reporting tool'
+	@echo '  usb                    - USB testing tools'
+	@echo '  virtio                 - vhost test module'
+	@echo '  mm                     - misc mm tools'
+	@echo '  wmi			- WMI interface examples'
+	@echo '  x86_energy_perf_policy - Intel energy policy tool'
+	@echo '  ynl			- ynl headers, library, and python tool'
+	@echo ''
+	@echo 'You can do:'
+	@echo ' $$ make -C tools/ <tool>_install'
+	@echo ''
+	@echo '  from the kernel command line to build and install one of'
+	@echo '  the tools above'
+	@echo ''
+	@echo '  $$ make tools/all'
+	@echo ''
+	@echo '  builds all tools.'
+	@echo ''
+	@echo '  $$ make tools/install'
+	@echo ''
+	@echo '  installs all tools.'
+	@echo ''
+	@echo 'Cleaning targets:'
+	@echo ''
+	@echo '  all of the above with the "_clean" string appended cleans'
+	@echo '    the respective build directory.'
+	@echo '  clean: a summary clean target to clean _all_ folders'
+
+acpi: FORCE
+	$(call descend,power/$@)
+
+cpupower: FORCE
+	$(call descend,power/$@)
+
+counter dma firewire hv guest bootconfig spi usb virtio mm bpf iio gpio objtool leds wmi firmware debugging tracing: FORCE
+	$(call descend,$@)
+
+bpf/%: FORCE
+	$(call descend,$@)
+
+libapi: FORCE
+	$(call descend,lib/api)
+
+nolibc: FORCE
+	$(call descend,include/nolibc)
+
+nolibc_%: FORCE
+	$(call descend,include/nolibc,$(patsubst nolibc_%,%,$@))
+
+# The perf build does not follow the descend function setup,
+# invoking it via it's own make rule.
+PERF_O   = $(if $(O),$(O)/tools/perf,)
+
+perf: FORCE
+	$(Q)mkdir -p $(PERF_O) .
+	$(Q)$(MAKE) --no-print-directory -C perf O=$(PERF_O) subdir=
+
+sched_ext: FORCE
+	$(call descend,sched_ext)
+
+selftests: FORCE
+	$(call descend,testing/$@)
+
+thermal: FORCE
+	$(call descend,lib/$@)
+
+turbostat x86_energy_perf_policy intel-speed-select: FORCE
+	$(call descend,power/x86/$@)
+
+tmon: FORCE
+	$(call descend,thermal/$@)
+
+thermometer: FORCE
+	$(call descend,thermal/$@)
+
+thermal-engine: FORCE thermal
+	$(call descend,thermal/$@)
+
+freefall: FORCE
+	$(call descend,laptop/$@)
+
+kvm_stat: FORCE
+	$(call descend,kvm/$@)
+
+ynl: FORCE
+	$(call descend,net/ynl)
+
+all: acpi counter cpupower dma gpio hv firewire \
+		perf selftests bootconfig spi turbostat usb \
+		virtio mm bpf x86_energy_perf_policy \
+		tmon freefall iio objtool kvm_stat wmi \
+		debugging tracing thermal thermometer thermal-engine ynl
+
+acpi_install:
+	$(call descend,power/$(@:_install=),install)
+
+cpupower_install:
+	$(call descend,power/$(@:_install=),install)
+
+counter_install dma_install firewire_install gpio_install hv_install iio_install perf_install bootconfig_install spi_install usb_install virtio_install mm_install bpf_install objtool_install wmi_install debugging_install tracing_install:
+	$(call descend,$(@:_install=),install)
+
+selftests_install:
+	$(call descend,testing/$(@:_install=),install)
+
+thermal_install:
+	$(call descend,lib/$(@:_install=),install)
+
+turbostat_install x86_energy_perf_policy_install intel-speed-select_install:
+	$(call descend,power/x86/$(@:_install=),install)
+
+tmon_install:
+	$(call descend,thermal/$(@:_install=),install)
+
+thermometer_install:
+	$(call descend,thermal/$(@:_install=),install)
+
+thermal-engine_install:
+	$(call descend,thermal/$(@:_install=),install)
+
+freefall_install:
+	$(call descend,laptop/$(@:_install=),install)
+
+kvm_stat_install:
+	$(call descend,kvm/$(@:_install=),install)
+
+ynl_install:
+	$(call descend,net/$(@:_install=),install)
+
+install: acpi_install counter_install cpupower_install dma_install gpio_install \
+		hv_install firewire_install iio_install \
+		perf_install selftests_install turbostat_install usb_install \
+		virtio_install mm_install bpf_install x86_energy_perf_policy_install \
+		tmon_install freefall_install objtool_install kvm_stat_install \
+		wmi_install debugging_install intel-speed-select_install \
+		tracing_install thermometer_install thermal-engine_install ynl_install
+
+acpi_clean:
+	$(call descend,power/acpi,clean)
+
+cpupower_clean:
+	$(call descend,power/cpupower,clean)
+
+counter_clean dma_clean hv_clean firewire_clean bootconfig_clean spi_clean usb_clean virtio_clean mm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean firmware_clean debugging_clean tracing_clean:
+	$(call descend,$(@:_clean=),clean)
+
+libapi_clean:
+	$(call descend,lib/api,clean)
+
+libbpf_clean:
+	$(call descend,lib/bpf,clean)
+
+libsubcmd_clean:
+	$(call descend,lib/subcmd,clean)
+
+perf_clean:
+	$(Q)mkdir -p $(PERF_O) .
+	$(Q)$(MAKE) --no-print-directory -C perf O=$(PERF_O) subdir= clean
+
+sched_ext_clean:
+	$(call descend,sched_ext,clean)
+
+selftests_clean:
+	$(call descend,testing/$(@:_clean=),clean)
+
+thermal_clean:
+	$(call descend,lib/thermal,clean)
+
+turbostat_clean x86_energy_perf_policy_clean intel-speed-select_clean:
+	$(call descend,power/x86/$(@:_clean=),clean)
+
+thermometer_clean:
+	$(call descend,thermal/thermometer,clean)
+
+thermal-engine_clean:
+	$(call descend,thermal/thermal-engine,clean)
+
+tmon_clean:
+	$(call descend,thermal/tmon,clean)
+
+freefall_clean:
+	$(call descend,laptop/freefall,clean)
+
+build_clean:
+	$(call descend,build,clean)
+
+ynl_clean:
+	$(call descend,net/$(@:_clean=),clean)
+
+clean: acpi_clean counter_clean cpupower_clean dma_clean hv_clean firewire_clean \
+		perf_clean selftests_clean turbostat_clean bootconfig_clean spi_clean usb_clean virtio_clean \
+		mm_clean bpf_clean iio_clean x86_energy_perf_policy_clean tmon_clean \
+		freefall_clean build_clean libbpf_clean libsubcmd_clean \
+		gpio_clean objtool_clean leds_clean wmi_clean firmware_clean debugging_clean \
+		intel-speed-select_clean tracing_clean thermal_clean thermometer_clean thermal-engine_clean \
+		sched_ext_clean ynl_clean
+
+.PHONY: FORCE