Andrea Righi 4109506b7e sched_ext: idle: Handle migration-disabled tasks in BPF code ... commit 55ed11b181c43d81ce03b50209e4e7c4a14ba099 upstream. When scx_bpf_select_cpu_dfl()/and() kfuncs are invoked outside of ops.select_cpu() we can't rely on @p->migration_disabled to determine if migration is disabled for the task @p. In fact, migration is always disabled for the current task while running BPF code: __bpf_prog_enter() disables migration and __bpf_prog_exit() re-enables it. To handle this, when @p->migration_disabled == 1, check whether @p is the current task. If so, migration was not disabled before entering the callback, otherwise migration was disabled. This ensures correct idle CPU selection in all cases. The behavior of ops.select_cpu() remains unchanged, because this callback is never invoked for the current task and migration-disabled tasks are always excluded. Example: without this change scx_bpf_select_cpu_and() called from ops.enqueue() always returns -EBUSY; with this change applied, it correctly returns idle CPUs. Fixes: 06efc9fe0b ("sched_ext: idle: Handle migration-disabled tasks in idle selection") Cc: stable@vger.kernel.org # v6.16+ Signed-off-by: Andrea Righi <arighi@nvidia.com> Acked-by: Changwoo Min <changwoo@igalia.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-10-02 13:48:39 +02:00
..
bpf	bpf: Reject bpf_timer for PREEMPT_RT	2025-10-02 13:48:29 +02:00
cgroup	cgroup: split cgroup_destroy_wq into 3 workqueues	2025-09-25 11:16:41 +02:00
configs	Kbuild updates for v6.16	2025-06-07 10:05:35 -07:00
debug	TTY/Serial driver updates for 6.15-rc1	2025-04-02 18:17:33 -07:00
dma	dma-debug: don't enforce dma mapping check on noncoherent allocations	2025-09-19 16:37:26 +02:00
entry	entry: Inline syscall_exit_to_user_mode()	2025-04-29 08:27:10 +02:00
events	perf: Fix the POLL_HUP delivery breakage	2025-09-19 16:37:26 +02:00
futex	futex: Prevent use-after-free during requeue-PI	2025-10-02 13:48:33 +02:00
gcov	kbuild: require gcc-8 and binutils-2.30	2025-04-30 21:53:35 +02:00
irq	genirq/irq_sim: Initialize work context pointers properly	2025-06-13 15:36:35 +02:00
kcsan	kcsan: test: Initialize dummy variable	2025-08-15 16:38:50 +02:00
livepatch	sched,livepatch: Untangle cond_resched() and live-patching	2025-05-14 13:16:24 +02:00
locking	Generic:	2025-06-02 12:24:58 -07:00
module	module: Prevent silent truncation of module name in delete_module(2)	2025-08-20 18:41:28 +02:00
power	PM: hibernate: Restrict GFP mask in hibernation_snapshot()	2025-09-19 16:37:30 +02:00
printk	printk: nbcon: Allow reacquire during panic	2025-08-20 18:41:30 +02:00
rcu	rcu: Fix racy re-initialization of irq_work causing hangs	2025-08-20 18:41:43 +02:00
sched	sched_ext: idle: Handle migration-disabled tasks in BPF code	2025-10-02 13:48:39 +02:00
time	hrtimers: Unconditionally update target CPU base after offline timer migration	2025-09-19 16:37:34 +02:00
trace	tracing: fprobe: Fix to remove recorded module addresses from filter	2025-10-02 13:48:36 +02:00
.gitignore	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-08-20 18:41:31 +02:00
acct.c	acct: block access to kernel internal filesystems	2025-02-12 12:24:16 +01:00
async.c
audit_fsnotify.c
audit_tree.c	replace collect_mounts()/drop_collected_mounts() with a safer variant	2025-06-23 14:01:49 -04:00
audit_watch.c	fs: add kern_path_locked_negative()	2025-04-15 11:32:34 +02:00
audit.c	audit: record AUDIT_ANOM_* events regardless of presence of rules	2025-04-11 14:14:41 -04:00
audit.h	audit,module: restore audit logging in load failure case	2025-08-15 16:38:20 +02:00
auditfilter.c	audit: fix out-of-bounds read in audit_compare_dname_path()	2025-09-09 19:02:34 +02:00
auditsc.c	audit,module: restore audit logging in load failure case	2025-08-15 16:38:20 +02:00
backtracetest.c	backtracetest: add MODULE_DESCRIPTION()	2024-06-24 22:24:55 -07:00
bounds.c
capability.c	capability: Remove unused has_capability	2025-03-07 22:03:09 -06:00
cfi.c	Modules changes for 6.15-rc1	2025-03-30 15:44:36 -07:00
compat.c
configs.c
context_tracking.c	context_tracking: Make RCU watch ct_kernel_exit_state() warning	2025-03-04 18:44:29 -08:00
cpu_pm.c
cpu.c	perf: Remove too early and redundant CPU hotplug handling	2025-05-08 21:50:19 +02:00
crash_core.c	crash: Use note name macros	2025-02-10 16:56:58 -08:00
crash_dump_dm_crypt.c	crash_dump: retrieve dm crypt keys in kdump kernel	2025-05-21 10:48:21 -07:00
crash_reserve.c	crash: fix spelling mistake "crahskernel" -> "crashkernel"	2025-05-11 17:54:10 -07:00
cred.c	cred: remove old {override,revert}_creds() helpers	2024-12-02 11:25:09 +01:00
delayacct.c	delayacct: remove redundant code and adjust indentation	2025-05-27 19:40:33 -07:00
dma.c
elfcorehdr.c
exec_domain.c
exit.c	- Avoid a crash on a heterogeneous machine where not all cores support the	2025-06-22 10:11:45 -07:00
exit.h
extable.c
fail_function.c
fork.c	futex: Use correct exit on failure from futex_hash_allocate_default()	2025-10-02 13:48:33 +02:00
freezer.c	sched,freezer: Remove unnecessary warning in __thaw_task	2025-07-17 07:56:50 -10:00
gen_kheaders.sh	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-08-20 18:41:31 +02:00
groups.c
hung_task.c	hung_task: show the blocker task if the task is hung on semaphore	2025-05-11 17:54:08 -07:00
iomem.c	mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()	2025-02-21 15:05:38 +01:00
irq_work.c	kasan: make kasan_record_aux_stack_noalloc() the default behaviour	2025-01-13 22:40:36 -08:00
jump_label.c	jump_label: Use RCU in all users of __module_text_address().	2025-03-10 11:54:46 +01:00
kallsyms_internal.h	kallsyms: get rid of code for absolute kallsyms	2024-07-20 16:33:21 +09:00
kallsyms_selftest.c	kallsyms: Use kthread_run_on_cpu()	2025-01-02 22:12:12 +01:00
kallsyms_selftest.h
kallsyms.c	kallsyms: Remove KALLSYMS_ABSOLUTE_PERCPU	2025-02-18 10:16:04 +01:00
kcmp.c	kcmp: improve performance adding an unlikely hint to task comparisons	2025-02-21 10:25:33 +01:00
Kconfig.freezer
Kconfig.hz	kernel: Fix "select" wording on HZ_250 description	2025-02-21 09:20:30 +01:00
Kconfig.kexec	kho: mm: don't allow deferred struct page with KHO	2025-08-28 16:34:34 +02:00
Kconfig.locks
Kconfig.preempt	sched: No PREEMPT_RT=y for all{yes,mod}config	2024-11-07 15:25:05 +01:00
kcov.c	kcov: mark in_softirq_really() as __always_inline	2024-12-30 17:59:08 -08:00
kexec_core.c	kexec_core: Fix error code path in the KEXEC_JUMP flow	2025-08-15 16:38:34 +02:00
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-03-16 22:30:47 -07:00
kexec_file.c	- The 3 patch series "hung_task: extend blocking task stacktrace dump to	2025-05-31 19:12:53 -07:00
kexec_handover.c	kho: warn if KHO is disabled due to an error	2025-08-28 16:34:35 +02:00
kexec_internal.h	kexec: add KHO support to kexec file loads	2025-05-12 23:50:40 -07:00
kexec.c
kheaders.c	kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()	2024-12-24 09:46:49 +01:00
kprobes.c	kprobes: Use RCU in all users of __module_text_address().	2025-03-10 11:54:46 +01:00
ksyms_common.c
ksysfs.c	kernel/ksysfs.c: simplify bin_attribute definition	2025-01-07 16:59:15 +01:00
kthread.c	ipvs: Fix estimator kthreads preferred affinity	2025-08-20 18:40:52 +02:00
latencytop.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
Makefile	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-08-20 18:41:31 +02:00
module_signature.c
notifier.c	reboot: move reboot_notifier_list to kernel/reboot.c	2024-11-05 17:12:31 -08:00
nsproxy.c	kernel/nsproxy: remove unnecessary guards	2025-05-09 13:13:54 +02:00
padata.c	padata: Fix pd UAF once and for all	2025-08-15 16:38:58 +02:00
panic.c	- The 3 patch series "hung_task: extend blocking task stacktrace dump to	2025-05-31 19:12:53 -07:00
params.c	module: ensure that kobject_put() is safe for module type kobjects	2025-05-07 20:24:59 +02:00
pid_namespace.c	pid: Do not set pid_max in new pid namespaces	2025-03-06 10:18:36 +01:00
pid_sysctl.h	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
pid.c	pidfs: detect refcount bugs	2025-05-06 13:59:00 +02:00
profile.c	profiling: remove profile=sleep support	2024-08-04 13:36:28 -07:00
ptrace.c	ptrace: introduce PTRACE_SET_SYSCALL_INFO request	2025-05-11 17:48:15 -07:00
range.c
reboot.c	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
regset.c
relay.c	relay: remove unused relay_late_setup_files	2025-05-11 17:54:09 -07:00
resource_kunit.c	resource, kunit: fix user-after-free in resource_test_region_intersects()	2024-10-09 12:47:19 -07:00
resource.c	resource: fix false warning in __request_region()	2025-07-24 17:57:59 -07:00
rseq.c	rseq: Fix segfault on registration when rseq_cs is non-zero	2025-03-06 22:26:49 +01:00
scftorture.c	scftorture: Handle NULL argument passed to scf_add_to_free_list().	2024-11-14 16:09:51 -08:00
scs.c
seccomp.c	seccomp: avoid the lock trip seccomp_filter_release in common case	2025-02-24 11:17:10 -08:00
signal.c	signal: Fix memory leak for PIDFD_SELF* sentinels	2025-08-28 16:34:38 +02:00
smp.c	CSD-lock pull request for v6.14	2025-01-28 11:34:03 -08:00
smpboot.c
smpboot.h
softirq.c	lockdep: Fix wait context check on softirq for PREEMPT_RT	2025-03-25 10:46:44 +01:00
stackleak.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
stacktrace.c
static_call_inline.c	Modules changes for 6.15-rc1	2025-03-30 15:44:36 -07:00
static_call.c
stop_machine.c	sched/core: Fix migrate_swap() vs. hotplug	2025-07-01 15:02:03 +02:00
sys_ni.c	Probes updates for v6.11:	2024-07-18 12:19:20 -07:00
sys.c	futex: Add basic infrastructure for local task local hash	2025-05-03 12:02:07 +02:00
sysctl-test.c	sysctl: move u8 register test to lib/test_sysctl.c	2025-04-14 14:13:41 +02:00
sysctl.c	sparc: mv sparc sysctls into their own file under arch/sparc/kernel	2025-04-09 13:32:16 +02:00
task_work.c	kasan: make kasan_record_aux_stack_noalloc() the default behaviour	2025-01-13 22:40:36 -08:00
taskstats.c	fdget(), more trivial conversions	2024-11-03 01:28:06 -05:00
torture.c	torture: Add get_torture_init_jiffies() for test-start time	2025-02-05 07:14:24 -08:00
tracepoint.c	tracepoint: Print the function symbol when tracepoint_debug is set	2025-03-21 15:30:10 -04:00
tsacct.c	tsacct: replace strncpy() with strscpy()	2024-07-12 16:39:53 -07:00
ucount.c	ucount: fix atomic_long_inc_below() argument type	2025-08-15 16:39:17 +02:00
uid16.c
uid16.h
umh.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
up.c
user_namespace.c	uidgid: add map_id_range_up()	2025-02-12 12:12:27 +01:00
user-return-notifier.c
user.c	uidgid: make sure we fit into one cacheline	2024-09-12 12:16:09 +02:00
usermode_driver.c
utsname_sysctl.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
utsname.c
vhost_task.c	vhost: Take a reference on the task in struct vhost_task.	2025-10-02 13:48:31 +02:00
vmcore_info.c	crash: export PAGE_UNACCEPTED_MAPCOUNT_VALUE to vmcoreinfo	2025-05-11 17:54:04 -07:00
watch_queue.c	vfs-6.15-rc1.pipe	2025-03-24 09:52:37 -07:00
watchdog_buddy.c
watchdog_perf.c	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
watchdog.c	kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count	2025-05-21 10:48:22 -07:00
workqueue_internal.h
workqueue.c	workqueue: Initialize wq_isolated_cpumask in workqueue_init_early()	2025-06-17 08:58:29 -10:00