Nicolas Saenz Julienne e06a31e61f nohz/full, sched/rt: Fix missed tick-reenabling bug in dequeue_task_rt() ... [ Upstream commit 5c66d1b9b3 ] dequeue_task_rt() only decrements 'rt_rq->rt_nr_running' after having called sched_update_tick_dependency() preventing it from re-enabling the tick on systems that no longer have pending SCHED_RT tasks but have multiple runnable SCHED_OTHER tasks: dequeue_task_rt() dequeue_rt_entity() dequeue_rt_stack() dequeue_top_rt_rq() sub_nr_running() // decrements rq->nr_running sched_update_tick_dependency() sched_can_stop_tick() // checks rq->rt.rt_nr_running, ... __dequeue_rt_entity() dec_rt_tasks() // decrements rq->rt.rt_nr_running ... Every other scheduler class performs the operation in the opposite order, and sched_update_tick_dependency() expects the values to be updated as such. So avoid the misbehaviour by inverting the order in which the above operations are performed in the RT scheduler. Fixes: 76d92ac305 ("sched: Migrate sched to use new tick dependency mask model") Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <vschneid@redhat.com> Reviewed-by: Phil Auld <pauld@redhat.com> Link: https://lore.kernel.org/r/20220628092259.330171-1-nsaenzju@redhat.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-08-21 15:15:36 +02:00
..
bpf	bpf: Make sure mac_header was set before using it	2022-07-29 17:19:23 +02:00
cgroup	cgroup: Use separate src/dst nodes when preloading css_sets for migration	2022-07-21 21:20:00 +02:00
configs
debug	lockdown: also lock down previous kgdb use	2022-05-30 09:33:22 +02:00
dma	dma-direct: don't over-decrypt memory	2022-06-22 14:13:20 +02:00
entry	KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest	2021-10-06 15:55:49 +02:00
events	perf/core: Fix data race between perf_event_set_output() and perf_mmap_close()	2022-07-29 17:19:11 +02:00
gcov	gcov: re-fix clang-11+ support	2021-04-14 08:41:58 +02:00
irq	genirq: GENERIC_IRQ_IPI depends on SMP	2022-08-21 15:15:28 +02:00
kcsan	kcsan: Fix debugfs initcall return type	2021-05-26 12:06:54 +02:00
livepatch	livepatch: Fix build failure on 32 bits processors	2022-04-08 14:40:15 +02:00
locking	locking/lockdep: Fix lockdep_init_map_*() confusion	2022-08-21 15:15:33 +02:00
power	PM: hibernate: defer device probing when resuming from hibernation	2022-08-21 15:15:31 +02:00
printk	printk: fix return value of printk.devkmsg __setup handler	2022-04-08 14:40:08 +02:00
rcu	rcu: Make TASKS_RUDE_RCU select IRQ_WORK	2022-06-09 10:20:51 +02:00
sched	nohz/full, sched/rt: Fix missed tick-reenabling bug in dequeue_task_rt()	2022-08-21 15:15:36 +02:00
time	fix race between exit_itimers() and /proc/pid/timers	2022-07-21 21:19:59 +02:00
trace	blktrace: Trace remapped requests correctly	2022-08-21 15:15:36 +02:00
.gitignore	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:47:37 +02:00
acct.c	kernel: acct.c: fix some kernel-doc nits	2020-10-16 11:11:19 -07:00
async.c	Revert "module, async: async_synchronize_full() on module init iff async is used"	2022-02-23 12:01:00 +01:00
audit.c	audit: improve audit queue handling when "audit=1" on cmdline	2022-02-08 18:30:34 +01:00
audit.h	audit: log AUDIT_TIME_* records only from rules	2022-04-08 14:40:00 +02:00
audit_fsnotify.c	fsnotify: generalize handle_inode_event()	2020-12-30 11:54:18 +01:00
audit_tree.c	audit: move put_tree() to avoid trim_trees refcount underflow and UAF	2021-09-03 10:09:31 +02:00
audit_watch.c	fsnotify: generalize handle_inode_event()	2020-12-30 11:54:18 +01:00
auditfilter.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
auditsc.c	audit: log AUDIT_TIME_* records only from rules	2022-04-08 14:40:00 +02:00
backtracetest.c
bounds.c
capability.c	LSM: Signal to SafeSetID when setting group IDs	2020-10-13 09:17:34 -07:00
compat.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
configs.c
context_tracking.c
cpu.c	random: clear fast pool, crng, and batches in cpuhp bring up	2022-05-30 09:33:36 +02:00
cpu_pm.c	PM: cpu: Make notifier chain use a raw_spinlock_t	2021-09-15 09:50:40 +02:00
crash_core.c	crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo	2021-06-23 14:42:52 +02:00
crash_dump.c
cred.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
delayacct.c
dma.c
exec_domain.c
exit.c	fix race between exit_itimers() and /proc/pid/timers	2022-07-21 21:19:59 +02:00
extable.c
fail_function.c	fail_function: Remove a redundant mutex unlock	2020-11-19 11:58:16 -08:00
fork.c	copy_process(): Move fd_install() out of sighand->siglock critical section	2022-02-23 12:01:08 +01:00
freezer.c	Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing"	2021-04-07 15:00:14 +02:00
futex.c	mm, futex: fix shared futex pgoff on shmem huge page	2021-06-30 08:47:29 -04:00
gen_kheaders.sh
groups.c	LSM: Signal to SafeSetID when setting group IDs	2020-10-13 09:17:34 -07:00
hung_task.c	kernel/hung_task.c: make type annotations consistent	2020-11-02 12:14:19 -08:00
iomem.c
irq_work.c
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-20 16:05:58 +02:00
kallsyms.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
kcmp.c	exec: Transform exec_update_mutex into a rw_semaphore	2021-01-09 13:46:24 +01:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: make some symbols static	2020-08-12 10:58:02 -07:00
kexec.c	LSM: Introduce kernel_post_load_data() hook	2020-10-05 13:37:03 +02:00
kexec_core.c	kernel: kexec: remove the lock operation of system_transition_mutex	2021-02-03 23:28:37 +01:00
kexec_elf.c
kexec_file.c	ima: force signature verification when CONFIG_KEXEC_SIG is configured	2022-07-21 21:20:11 +02:00
kexec_internal.h
kheaders.c
kmod.c	kmod: remove redundant "be an" in the comment	2020-08-12 10:58:01 -07:00
kprobes.c	kprobes: Limit max data_size of the kretprobe instances	2021-12-08 09:03:20 +01:00
ksysfs.c
kthread.c	kthread: Fix PF_KTHREAD vs to_kthread() race	2021-09-03 10:09:31 +02:00
latencytop.c
Makefile	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:47:37 +02:00
module-internal.h
module.c	module: check for exit sections in layout_sections() instead of module_init_section()	2022-05-25 09:18:02 +02:00
module_signature.c	module: harden ELF info handling	2021-03-25 09:04:11 +01:00
module_signing.c	module: harden ELF info handling	2021-03-25 09:04:11 +01:00
notifier.c	notifier: Fix broken error handling pattern	2020-09-01 09:58:03 +02:00
nsproxy.c
padata.c	padata: fix possible padata_works_lock deadlock	2020-09-04 17:51:55 +10:00
panic.c	panic: don't dump stack twice on warn	2020-11-14 11:26:04 -08:00
params.c	params: Replace zero-length array with flexible-array member	2020-10-29 17:22:59 -05:00
pid.c	exec: Transform exec_update_mutex into a rw_semaphore	2021-01-09 13:46:24 +01:00
pid_namespace.c	memcg: enable accounting for pids in nested pid namespaces	2021-09-18 13:40:36 +02:00
profile.c	profiling: fix shift-out-of-bounds bugs	2021-09-26 14:08:58 +02:00
ptrace.c	ptrace: Reimplement PTRACE_KILL by always sending SIGKILL	2022-06-09 10:20:49 +02:00
range.c	kernel.h: split out min()/max() et al. helpers	2020-10-16 11:11:19 -07:00
reboot.c	reboot: fix overflow parsing reboot cpu number	2020-11-14 11:26:03 -08:00
regset.c
relay.c	kernel/relay.c: drop unneeded initialization	2020-10-16 11:11:22 -07:00
resource.c	kernel/resource: make walk_mem_res() find all busy IORESOURCE_MEM resources	2021-05-19 10:13:09 +02:00
rseq.c	rseq: Remove broken uapi field layout on 32-bit little endian	2022-04-08 14:40:03 +02:00
scftorture.c	scftorture: Fix distribution of short handler delays	2022-06-09 10:21:01 +02:00
scs.c	mm: memcontrol: account kernel stack per node	2020-08-07 11:33:25 -07:00
seccomp.c	seccomp: Fix setting loaded filter count during TSYNC	2021-08-18 08:59:06 +02:00
signal.c	signal handling: don't use BUG_ON() for debugging	2022-07-21 21:20:18 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-20 09:23:29 +02:00
smpboot.c	sched/core: Initialize the idle task with preemption disabled	2021-07-14 16:55:50 +02:00
smpboot.h
softirq.c	softirq: Add debug check to __raise_softirq_irqoff()	2020-09-16 15:18:56 +02:00
stackleak.c	gcc-plugins/stackleak: Use noinstr in favor of notrace	2022-02-23 12:01:00 +01:00
stacktrace.c	stacktrace: Remove reliable argument from arch_stack_walk() callback	2020-09-18 14:24:16 +01:00
static_call.c	static_call: Fix unused variable warn w/o MODULE	2021-09-08 08:49:00 +02:00
stop_machine.c	stop_machine, rcu: Mark functions as notrace	2020-10-26 12:12:27 +01:00
sys.c	prctl: allow to setup brk for et_dyn executables	2021-09-26 14:08:57 +02:00
sys_ni.c	mm/madvise: introduce process_madvise() syscall: an external memory hinting API	2020-10-18 09:27:10 -07:00
sysctl-test.c
sysctl.c	mm: sysctl: fix missing numa_stat when !CONFIG_HUGETLB_PAGE	2022-07-21 21:20:13 +02:00
task_work.c	task_work: cleanup notification modes	2020-10-17 15:05:30 -06:00
taskstats.c	taskstats: move specifying netlink policy back to ops	2020-10-02 19:11:12 -07:00
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Use rcu get state and cond sync for static call updates	2021-09-03 10:09:30 +02:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-01-27 10:54:33 +01:00
ucount.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-06 10:31:52 -07:00
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-14 09:50:46 +02:00
user-return-notifier.c
user.c
user_namespace.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
usermode_driver.c	bpf: Fix umd memory leak in copy_process()	2021-03-30 14:32:03 +02:00
utsname.c
utsname_sysctl.c
watch_queue.c	watch_queue: Fix missing locking in add_watch_to_object()	2022-08-03 12:00:44 +02:00
watchdog.c	watchdog: fix barriers when printing backtraces from all CPUs	2021-05-19 10:13:00 +02:00
watchdog_hld.c
workqueue.c	workqueue: Fix unbind_workers() VS wq_worker_running() race	2022-01-16 09:14:22 +01:00
workqueue_internal.h