Peter Zijlstra b5bf9a90bb sched/core: Introduce set_special_state() ... Gaurav reported a perceived problem with TASK_PARKED, which turned out to be a broken wait-loop pattern in __kthread_parkme(), but the reported issue can (and does) in fact happen for states that do not do condition based sleeps. When the 'current->state = TASK_RUNNING' store of a previous (concurrent) try_to_wake_up() collides with the setting of a 'special' sleep state, we can loose the sleep state. Normal condition based wait-loops are immune to this problem, but for sleep states that are not condition based are subject to this problem. There already is a fix for TASK_DEAD. Abstract that and also apply it to TASK_STOPPED and TASK_TRACED, both of which are also without condition based wait-loop. Reported-by: Gaurav Kohli <gkohli@codeaurora.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>		2018-05-04 07:54:54 +02:00
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autogroup.h
clock.h
coredump.h
cpufreq.h	sched/cpufreq: Provide migration hint	2018-03-09 07:59:20 +01:00
cputime.h
deadline.h	sched/headers: Simplify and clean up header usage in the scheduler	2018-03-04 12:39:29 +01:00
debug.h
hotplug.h
idle.h
init.h
isolation.h	sched/isolation: Isolate workqueues when "nohz_full=" is set	2018-02-21 09:49:08 +01:00
jobctl.h
loadavg.h
mm.h	exec: pass stack rlimit into mm layout functions	2018-04-11 10:28:37 -07:00
nohz.h	sched/nohz: Clean up nohz enter/exit	2018-03-09 07:59:19 +01:00
numa_balancing.h
prio.h
rt.h
signal.h	sched/core: Introduce set_special_state()	2018-05-04 07:54:54 +02:00
stat.h
sysctl.h
task_stack.h
task.h
topology.h
user.h	efivarfs: Limit the rate for non-root to read files	2018-02-22 10:21:02 -08:00
wake_q.h
xacct.h