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Peter Zijlstra b1a1c262e4 workqueue: Restrict affinity change to rescuer 
[ Upstream commit 640f17c82460e9724fd256f0a1f5d99e7ff0bda4 ]

create_worker() will already set the right affinity using
kthread_bind_mask(), this means only the rescuer will need to change
it's affinity.

Howveer, while in cpu-hot-unplug a regular task is not allowed to run
on online&&!active as it would be pushed away quite agressively. We
need KTHREAD_IS_PER_CPU to survive in that environment.

Therefore set the affinity after getting that magic flag.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210121103506.826629830@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-02-07 15:35:49 +01:00
..
bpf
bpf: Fix helper bpf_map_peek_elem_proto pointing to wrong callback
2021-01-23 15:57:56 +01:00
cgroup
cgroup: Fix memory leak when parsing multiple source parameters
2021-01-06 14:48:37 +01:00
configs
…
debug
kgdb: Make "kgdbcon" work properly with "kgdb_earlycon"
2020-11-05 11:43:16 +01:00
dma
swiotlb: fix "x86: Don't panic if can not alloc buffer for swiotlb"
2020-11-18 19:20:32 +01:00
events
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:44:55 +01:00
gcov
gcov: add support for GCC 10.1
2020-09-17 13:47:56 +02:00
irq
genirq/irqdomain: Don't try to free an interrupt that has no mapping
2020-12-30 11:51:14 +01:00
livepatch
livepatch: Nullify obj->mod in klp_module_coming()'s error path
2019-08-19 13:03:37 +02:00
locking
rtmutex: Remove unused argument from rt_mutex_proxy_unlock()
2021-01-30 13:54:09 +01:00
power
PM: hibernate: flush swap writer after marking
2021-02-03 23:25:57 +01:00
printk
printk: handle blank console arguments passed in.
2020-10-01 13:18:04 +02:00
rcu
arm64: smp: Tell RCU about CPUs that fail to come online
2020-11-24 13:29:01 +01:00
sched
sched: Reenable interrupts in do_sched_yield()
2020-12-30 11:51:03 +01:00
time
tick/sched: Remove bogus boot "safety" check
2021-01-06 14:48:40 +01:00
trace
tracing: Fix race in trace_open and buffer resize call
2021-01-30 13:54:10 +01:00
.gitignore
…
acct.c
…
async.c
…
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
audit: CONFIG_CHANGE don't log internal bookkeeping as an event
2020-10-01 13:17:32 +02:00
audit.c
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:30:59 +02:00
audit.h
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:30:59 +02:00
auditfilter.c
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:30:59 +02:00
auditsc.c
…
backtracetest.c
…
bounds.c
…
capability.c
…
compat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
configs.c
kernel/configs: Replace GPL boilerplate code with SPDX identifier
2019-07-30 18:34:15 +02:00
context_tracking.c
…
cpu_pm.c
kernel/cpu_pm: Fix uninitted local in cpu_pm
2020-06-22 09:31:22 +02:00
cpu.c
kernel/cpu: add arch override for clear_tasks_mm_cpumask() mm handling
2020-12-30 11:50:56 +01:00
crash_core.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230
2019-06-19 17:09:06 +02:00
crash_dump.c
…
cred.c
keys: Fix request_key() cache
2020-01-17 19:48:42 +01:00
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
don't dump the threads that had been already exiting when zapped.
2020-11-18 19:20:31 +01:00
extable.c
extable: Add function to search only kernel exception table
2019-08-21 22:23:48 +10:00
fail_function.c
fail_function: Remove a redundant mutex unlock
2020-11-24 13:29:18 +01:00
fork.c
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:44:55 +01:00
freezer.c
Revert "libata, freezer: avoid block device removal while system is frozen"
2019-10-06 09:11:37 -06:00
futex.c
futex: Handle faults correctly for PI futexes
2021-01-30 13:54:10 +01:00
gen_kheaders.sh
kbuild: add variables for compression tools
2020-09-03 11:27:10 +02:00
groups.c
…
hung_task.c
…
iomem.c
mm/nvdimm: add is_ioremap_addr and use that to check ioremap address
2019-07-12 11:05:40 -07:00
irq_work.c
…
jump_label.c
jump_label: Don't warn on __exit jump entries
2019-08-29 15:10:10 +01:00
kallsyms.c
kallsyms: Refactor kallsyms_show_value() to take cred
2020-07-16 08:16:44 +02:00
kcmp.c
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:44:55 +01:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
sched/rt, Kconfig: Unbreak def/oldconfig with CONFIG_PREEMPT=y
2019-07-22 18:05:11 +02:00
kcov.c
…
kexec_core.c
kernel: kexec: remove the lock operation of system_transition_mutex
2021-02-03 23:25:56 +01:00
kexec_elf.c
kexec_elf: support 32 bit ELF files
2019-09-06 23:58:44 +02:00
kexec_file.c
Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2019-09-28 08:14:15 -07:00
kexec_internal.h
…
kexec.c
kexec_load: Disable at runtime if the kernel is locked down
2019-08-19 21:54:15 -07:00
kheaders.c
…
kmod.c
kmod: make request_module() return an error when autoloading is disabled
2020-04-17 10:50:22 +02:00
kprobes.c
kprobes: Fix compiler warning for !CONFIG_KPROBES_ON_FTRACE
2020-10-01 13:18:25 +02:00
ksysfs.c
…
kthread.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-02-07 15:35:49 +01:00
latencytop.c
…
Makefile
elfcore: fix building with clang
2021-01-23 15:57:55 +01:00
module_signature.c
MODSIGN: Export module signature definitions
2019-08-05 18:39:56 -04:00
module_signing.c
MODSIGN: Export module signature definitions
2019-08-05 18:39:56 -04:00
module-internal.h
…
module.c
module: delay kobject uevent until after module init call
2021-01-06 14:48:40 +01:00
notifier.c
kernel/notifier.c: intercept duplicate registrations to avoid infinite loops
2020-10-01 13:17:23 +02:00
nsproxy.c
…
padata.c
padata: add separate cpuhp node for CPUHP_PADATA_DEAD
2020-06-17 16:40:22 +02:00
panic.c
panic: ensure preemption is disabled during panic()
2019-10-07 15:47:19 -07:00
params.c
lockdown: Lock down module params that specify hardware parameters (eg. ioport)
2019-08-19 21:54:16 -07:00
pid_namespace.c
proc/sysctl: add shared variables for range check
2019-07-18 17:08:07 -07:00
pid.c
kernel/pid.c: convert struct pid count to refcount_t
2019-07-16 19:23:24 -07:00
profile.c
…
ptrace.c
ptrace: Set PF_SUPERPRIV when checking capability
2020-11-24 13:29:24 +01:00
range.c
…
reboot.c
reboot: fix overflow parsing reboot cpu number
2020-11-18 19:20:30 +01:00
relay.c
kernel/relay.c: fix memleak on destroy relay channel
2020-08-26 10:40:51 +02:00
resource.c
/dev/mem: Revoke mappings when a driver claims the region
2020-06-24 17:50:35 +02:00
rseq.c
…
seccomp.c
seccomp: Set PF_SUPERPRIV when checking capability
2020-11-24 13:29:24 +01:00
signal.c
ptrace: fix task_join_group_stop() for the case when current is traced
2020-11-10 12:37:24 +01:00
smp.c
smp: Warn on function calls from softirq context
2019-07-20 11:27:16 +02:00
smpboot.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-02-07 15:35:49 +01:00
smpboot.h
…
softirq.c
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-07-08 11:01:13 -07:00
stackleak.c
…
stacktrace.c
stacktrace: Don't skip first entry on noncurrent tasks
2019-11-04 21:19:25 +01:00
stop_machine.c
stop_machine: Avoid potential race behaviour
2019-10-17 12:47:12 +02:00
sys_ni.c
arch: handle arches who do not yet define clone3
2019-06-21 01:54:53 +02:00
sys.c
kernel/sys.c: avoid copying possible padding bytes in copy_to_user
2020-10-01 13:17:23 +02:00
sysctl_binary.c
…
sysctl-test.c
kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()
2020-10-01 13:17:10 +02:00
sysctl.c
kernel: sysctl: make drop_caches write-only
2020-01-04 19:18:32 +01:00
task_work.c
…
taskstats.c
taskstats: fix data-race
2020-01-09 10:19:54 +01:00
test_kprobes.c
…
torture.c
torture: Remove exporting of internal functions
2019-08-01 14:30:22 -07:00
tracepoint.c
The main changes in this release include:
2019-07-18 11:51:00 -07:00
tsacct.c
…
ucount.c
proc/sysctl: add shared variables for range check
2019-07-18 17:08:07 -07:00
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-14 10:32:58 +02:00
up.c
smp: Remove smp_call_function() and on_each_cpu() return values
2019-06-23 14:26:26 +02:00
user_namespace.c
Keyrings namespacing
2019-07-08 19:36:47 -07:00
user-return-notifier.c
…
user.c
Keyrings namespacing
2019-07-08 19:36:47 -07:00
utsname_sysctl.c
…
utsname.c
…
watchdog_hld.c
…
watchdog.c
watchdog/softlockup: Enforce that timestamp is valid on boot
2020-02-24 08:36:52 +01:00
workqueue_internal.h
…
workqueue.c
workqueue: Restrict affinity change to rescuer
2021-02-07 15:35:49 +01:00