Kumar Kartikeya Dwivedi 15cf39221e selftests/bpf: Add stress test for rqspinlock in NMI ... Introduce a kernel module that will exercise lock acquisition in the NMI path, and bias toward creating contention such that NMI waiters end up being non-head waiters. Prior to the rqspinlock fix made in the commit 0d80e7f951 ("rqspinlock: Choose trylock fallback for NMI waiters"), it was possible for the queueing path of non-head waiters to get stuck in NMI, which this stress test reproduces fairly easily with just 3 CPUs. Both AA and ABBA flavors are supported, and it will serve as a test case for future fixes that address this corner case. More information about the problem in question is available in the commit cited above. When the fix is reverted, this stress test will lock up the system. To enable this test automatically through the test_progs infrastructure, add a load_module_params API to exercise both AA and ABBA cases when running the test. Note that the test runs for at most 5 seconds, and becomes a noop after that, in order to allow the system to make forward progress. In addition, CPU 0 is always kept untouched by the created threads and NMIs. The test will automatically scale to the number of available online CPUs. Note that at least 3 CPUs are necessary to run this test, hence skip the selftest in case the environment has less than 3 CPUs available. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20250927205304.199760-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2025-09-28 03:18:40 -07:00
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accounting	tools/getdelays: add backward compatibility for taskstats version	2025-08-02 12:01:41 -07:00
arch	ARM:	2025-08-29 13:54:26 -07:00
bootconfig	bootconfig: Fix negative seeks on 32-bit with LFS enabled	2025-08-21 08:16:31 +09:00
bpf	bpftool: Remove duplicate string.h header	2025-09-27 04:23:15 -07:00
build
certs
cgroup	memcg_slabinfo: Fix use of PG_slab	2025-07-23 11:55:22 +02:00
counter
crypto
debugging
firewire
firmware
gpio	tools: gpio: remove the include directory on make clean	2025-09-04 16:29:28 +02:00
hv
iio
include	bpf: bpf task work plumbing	2025-09-23 07:34:38 -07:00
kvm/kvm_stat
laptop
leds
lib	libbpf: Fix error when st-prefix_ops and ops from differ btf	2025-09-26 13:03:19 -07:00
memory-model
mm
net	tools: ynl-gen: fix nested array counting	2025-09-03 15:18:34 -07:00
objtool	objtool/LoongArch: Get table size correctly if LTO is enabled	2025-08-20 22:23:15 +08:00
pcmcia
perf	perf symbol-elf: Add support for the block argument for libbfd	2025-09-04 16:37:35 -07:00
power	cpupower: Allow control of boost feature on non-x86 based systems with boost support.	2025-08-15 10:49:14 -06:00
rcu
sched
sched_ext
scripts	tools headers: Sync syscall tables with the kernel source	2025-08-18 13:49:25 -07:00
sound
spi
testing	selftests/bpf: Add stress test for rqspinlock in NMI	2025-09-28 03:18:40 -07:00
thermal
time
tracing	rtla: Check pkg-config install	2025-08-19 20:32:54 -04:00
usb
verification	rv: Add opid per-cpu monitor	2025-07-28 16:47:35 -04:00
virtio
wmi
workqueue
writeback
Makefile