Ingo Molnar be6a2e4c46 Revert "sched/core: Do not use smp_processor_id() with preempt enabled in smpboot_thread_fn()" ... This reverts commit 4fa5cd5245. The original change widens a preempt-off section, to avoid a seemingly unsafe smp_processor_id() use. During review I overlooked two facts: - The code to calls a non-trivial function callback: ht->park(td->cpu); ... which might (and does occasionally) sleep, triggering the warning. - More importantly, as pointed out by Peter Zijlstra, using smp_processor_id() in that context is safe, if it's done from a kernel thread that is pinned to a single CPU - which is the case here. So revert to the original code that enables preemption sooner. Reported-by: kernel test robot <xiaolong.ye@intel.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Con Kolivas <kernel@kolivas.org> Cc: Alfred Chen <cchalpha@gmail.com> Link: http://lkml.kernel.org/r/20160930015102.GB20189@yexl-desktop Signed-off-by: Ingo Molnar <mingo@kernel.org>		2016-10-04 09:55:57 +02:00
..
bpf
configs
debug
events	Merge branch 'perf/urgent' into perf/core, to pick up fixes	2016-09-23 07:20:33 +02:00
gcov
irq	genirq: Make function __irq_do_set_handler() static	2016-09-25 16:46:52 -04:00
livepatch
locking	locking/lglock: Remove lglock implementation	2016-09-22 15:25:56 +02:00
power
printk
rcu	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-03 12:15:00 -07:00
sched	Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-03 16:13:28 -07:00
time
trace	Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-03 16:13:28 -07:00
.gitignore
acct.c
async.c
audit.c
audit.h
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cgroup.c	Merge branch 'linus' into locking/core, to pick up fixes	2016-09-30 10:54:46 +02:00
cgroup_freezer.c
cgroup_pids.c
compat.c
configs.c
context_tracking.c
cpu.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-03 19:43:08 -07:00
cpu_pm.c
cpuset.c	cpuset: fix non static symbol warning	2016-09-16 11:31:17 -04:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	sched/core: Optimize __schedule()	2016-09-22 14:53:45 +02:00
extable.c
fork.c	fork: Optimize task creation by caching two thread stacks per CPU if CONFIG_VMAP_STACK=y	2016-09-16 09:18:54 +02:00
freezer.c
futex.c
futex_compat.c
groups.c
hung_task.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c
kexec_core.c
kexec_file.c
kexec_internal.h
kmod.c
kprobes.c
ksysfs.c
kthread.c	kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function	2016-09-16 09:18:53 +02:00
latencytop.c
Makefile
membarrier.c
memremap.c
module-internal.h
module.c
module_signing.c
notifier.c
nsproxy.c
padata.c	padata: Convert to hotplug state machine	2016-09-19 21:44:30 +02:00
panic.c
params.c
pid.c
pid_namespace.c
profile.c
ptrace.c
range.c
reboot.c
relay.c
resource.c
seccomp.c
signal.c
smp.c	smp: Allocate smp_call_on_cpu() workqueue on stack too	2016-09-22 14:49:10 +02:00
smpboot.c	Revert "sched/core: Do not use smp_processor_id() with preempt enabled in smpboot_thread_fn()"	2016-10-04 09:55:57 +02:00
smpboot.h
softirq.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-03 19:43:08 -07:00
stacktrace.c
stop_machine.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-03 13:39:00 -07:00
sys.c
sys_ni.c
sysctl.c
sysctl_binary.c
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c
workqueue.c
workqueue_internal.h