Luca Abeni fd8cb2e71c sched/deadline: Fix switching to -deadline ...

commit 295d6d5e37 upstream.

Fix a bug introduced in:

  72f9f3fdc9 ("sched/deadline: Remove dl_new from struct sched_dl_entity")

After that commit, when switching to -deadline if the scheduling
deadline of a task is in the past then switched_to_dl() calls
setup_new_entity() to properly initialize the scheduling deadline
and runtime.

The problem is that the task is enqueued _before_ having its parameters
initialized by setup_new_entity(), and this can cause problems.
For example, a task with its out-of-date deadline in the past will
potentially be enqueued as the highest priority one; however, its
adjusted deadline may not be the earliest one.

This patch fixes the problem by initializing the task's parameters before
enqueuing it.

Signed-off-by: luca abeni <luca.abeni@santannapisa.it>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1504778971-13573-3-git-send-email-luca.abeni@santannapisa.it
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-09-15 09:45:35 +02:00

..

autogroup.c

sched/autogroup: Fix possible Spectre-v1 indexing for sched_prio_to_weight[]

2018-05-16 10:10:30 +02:00

autogroup.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

clock.c

sched/clock: Fix early boot preempt assumption in __set_sched_clock_stable()

2017-05-24 09:10:00 +02:00

completion.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

core.c

sched/smt: Update sched_smt_present at runtime

2018-08-15 18:12:51 +02:00

cpuacct.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

cpuacct.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

cpudeadline.c

sched/deadline: Change return value of cpudl_find()

2017-08-10 12:18:17 +02:00

cpudeadline.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

cpufreq_schedutil.c

cpufreq: schedutil: Avoid using invalid next_freq

2018-05-16 10:10:29 +02:00

cpufreq.c

cpufreq / sched: Pass flags to cpufreq_update_util()

2016-08-16 22:14:55 +02:00

cpupri.c

sched/cpupri: Don't re-initialize 'struct cpupri'

2017-08-10 12:18:14 +02:00

cpupri.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

cputime.c

sched/cputime: Don't use smp_processor_id() in preemptible context

2017-07-14 10:27:15 +02:00

deadline.c

sched/deadline: Fix switching to -deadline

2018-09-15 09:45:35 +02:00

debug.c

sched/debug: Remove unused variable

2017-09-29 10:09:09 +02:00

fair.c

sched/smt: Update sched_smt_present at runtime

2018-08-15 18:12:51 +02:00

features.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

idle_task.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

idle.c

PM / s2idle: Rename ->enter_freeze to ->enter_s2idle

2017-08-11 01:29:56 +02:00

loadavg.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

membarrier.c

membarrier: Disable preemption when calling smp_call_function_many()

2018-01-17 09:45:23 +01:00

rt.c

sched/rt: Restore rt_runtime after disabling RT_RUNTIME_SHARE

2018-09-05 09:26:29 +02:00

sched-pelt.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

sched.h

sched/debug: Move the print_rt_rq() and print_dl_rq() declarations to kernel/sched/sched.h

2018-06-21 04:03:01 +09:00

stats.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

stats.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

stop_task.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

swait.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

topology.c

sched/rt: Up the root domain ref count when passing it around via IPIs

2018-02-16 20:22:44 +01:00

wait_bit.c

sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming

2017-06-20 12:19:14 +02:00

wait.c

sched/wait: Fix add_wait_queue() behavioral change

2018-02-16 20:22:43 +01:00