Andrea Parri e8e0bd4915 sched/core: Use READ_ONCE()/WRITE_ONCE() in move_queued_task()/task_rq_lock() ... [ Upstream commit c546951d9c ] move_queued_task() synchronizes with task_rq_lock() as follows: move_queued_task() task_rq_lock() [S] ->on_rq = MIGRATING [L] rq = task_rq() WMB (__set_task_cpu()) ACQUIRE (rq->lock); [S] ->cpu = new_cpu [L] ->on_rq where "[L] rq = task_rq()" is ordered before "ACQUIRE (rq->lock)" by an address dependency and, in turn, "ACQUIRE (rq->lock)" is ordered before "[L] ->on_rq" by the ACQUIRE itself. Use READ_ONCE() to load ->cpu in task_rq() (c.f., task_cpu()) to honor this address dependency. Also, mark the accesses to ->cpu and ->on_rq with READ_ONCE()/WRITE_ONCE() to comply with the LKMM. Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul E. McKenney <paulmck@linux.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Link: https://lkml.kernel.org/r/20190121155240.27173-1-andrea.parri@amarulasolutions.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-04-05 22:33:12 +02:00
..
bpf	bpf: do not restore dst_reg when cur_state is freed	2019-04-03 06:26:30 +02:00
cgroup	cgroup, rstat: Don't flush subtree root unless necessary	2019-04-05 22:33:06 +02:00
configs	kconfig: tinyconfig: remove stale stack protector fixups	2018-06-15 07:15:28 +09:00
debug	kdb: Don't back trace on a cpu that didn't round up	2019-02-12 19:47:19 +01:00
dma	dma-direct: do not include SME mask in the DMA supported check	2019-01-13 09:51:05 +01:00
events	perf/aux: Make perf_event accessible to setup_aux()	2019-04-05 22:33:11 +02:00
gcov	gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT	2018-06-08 18:56:02 +09:00
irq	genirq: Avoid summation loops for /proc/stat	2019-04-05 22:33:09 +02:00
livepatch	Merge branch 'for-4.19/upstream' into for-linus	2018-08-20 18:33:50 +02:00
locking	locking/lockdep: Add debug_locks check in __lock_downgrade()	2019-03-27 14:14:43 +09:00
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2018-10-12 12:35:02 +02:00
printk	printk: Fix panic caused by passing log_buf_len to command line	2018-11-13 11:08:48 -08:00
rcu	kprobes: Prohibit probing on RCU debug routine	2019-04-05 22:33:08 +02:00
sched	sched/core: Use READ_ONCE()/WRITE_ONCE() in move_queued_task()/task_rq_lock()	2019-04-05 22:33:12 +02:00
time	timekeeping: Use proper seqcount initializer	2019-02-12 19:47:05 +01:00
trace	tracing: kdb: Fix ftdump to not sleep	2019-04-05 22:32:56 +02:00
.gitignore
acct.c
async.c
audit.c	audit: use ktime_get_coarse_real_ts64() for timestamps	2018-07-17 14:45:08 -04:00
audit.h
audit_fsnotify.c	fsnotify: add fsnotify_add_inode_mark() wrappers	2018-05-18 14:58:22 +02:00
audit_tree.c	\n	2018-08-17 09:41:28 -07:00
audit_watch.c	audit: fix use-after-free in audit_add_watch	2018-07-18 11:43:36 -04:00
auditfilter.c	audit: rename FILTER_TYPE to FILTER_EXCLUDE	2018-06-19 10:39:54 -04:00
auditsc.c	audit/stable-4.18 PR 20180814	2018-08-15 10:46:54 -07:00
backtracetest.c
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-11-13 11:08:47 -08:00
capability.c
compat.c	time: Enable get/put_compat_itimerspec64 always	2018-06-24 14:39:47 +02:00
configs.c
context_tracking.c
cpu.c	cpu/hotplug: Prevent crash when CPU bringup fails on CONFIG_HOTPLUG_CPU=n	2019-04-03 06:26:29 +02:00
cpu_pm.c
crash_core.c	kernel/crash_core.c: print timestamp using time64_t	2018-08-22 10:52:47 -07:00
crash_dump.c
cred.c
delayacct.c	delayacct: Use raw_spinlocks	2018-04-27 14:34:51 +02:00
dma.c	proc: introduce proc_create_single{,_data}	2018-05-16 07:23:35 +02:00
elfcore.c
exec_domain.c	proc: introduce proc_create_single{,_data}	2018-05-16 07:23:35 +02:00
exit.c	sched/wait: Fix rcuwait_wake_up() ordering	2019-03-05 17:58:49 +01:00
extable.c
fail_function.c	bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe	2018-06-21 12:33:19 +02:00
fork.c	fork: record start_time late	2019-01-13 09:51:04 +01:00
freezer.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
futex.c	futex: Ensure that futex address is aligned in handle_futex_death()	2019-03-27 14:14:40 +09:00
futex_compat.c
groups.c
hung_task.c	kernel/hung_task.c: force console verbose before panic	2019-02-12 19:47:19 +01:00
iomem.c	memremap: split devm_memremap_pages() and memremap() infrastructure	2018-05-15 23:08:33 -07:00
irq_work.c
jump_label.c	jump_label: Fix typo in warning message	2018-09-10 10:15:48 +02:00
kallsyms.c	kallsyms, x86: Export addresses of PTI entry trampolines	2018-08-14 19:12:29 -03:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt	kconfig: include kernel/Kconfig.preempt from init/Kconfig	2018-08-02 08:06:54 +09:00
kcov.c	kernel/kcov.c: mark write_comp_data() as notrace	2019-02-12 19:47:20 +01:00
kexec.c	kexec: add call to LSM hook in original kexec_load syscall	2018-07-16 12:31:57 -07:00
kexec_core.c	kexec: yield to scheduler when loading kimage segments	2018-06-15 07:55:24 +09:00
kexec_file.c	treewide: Use array_size() in vzalloc()	2018-06-12 16:19:22 -07:00
kexec_internal.h
kmod.c
kprobes.c	kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()	2018-11-13 11:08:28 -08:00
ksysfs.c
kthread.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-08-13 11:25:07 -07:00
latencytop.c
Makefile	kbuild: move bin2c back to scripts/ from scripts/basic/	2018-07-18 01:18:05 +09:00
memremap.c	mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support	2019-01-13 09:51:04 +01:00
module-internal.h	modsign: log module name in the event of an error	2018-07-02 11:36:17 +02:00
module.c	kobject: return error code if writing /sys/.../uevent fails	2019-02-12 19:47:06 +01:00
module_signing.c	modsign: log module name in the event of an error	2018-07-02 11:36:17 +02:00
notifier.c
nsproxy.c
padata.c
panic.c	panic: avoid deadlocks in re-entrant console drivers	2018-12-29 13:37:57 +01:00
params.c	kernel/params.c: downgrade warning for unsafe parameters	2018-04-11 10:28:37 -07:00
pid.c	Fix failure path in alloc_pid()	2019-01-13 09:51:06 +01:00
pid_namespace.c	Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2018-04-03 19:15:32 -07:00
profile.c
ptrace.c	ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS	2018-12-05 19:32:03 +01:00
range.c
reboot.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
relay.c	relay: check return of create_buf_file() properly	2019-03-13 14:02:35 -07:00
resource.c	libnvdimm for 4.18	2018-06-08 17:21:52 -07:00
rseq.c	rseq: uapi: Declare rseq_cs field as union, update includes	2018-07-10 22:18:52 +02:00
seccomp.c	audit/stable-4.18 PR 20180605	2018-06-06 16:34:00 -07:00
signal.c	signal: Restore the stop PTRACE_EVENT_EXIT	2019-02-20 10:25:48 +01:00
smp.c	cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM	2019-02-12 19:47:25 +01:00
smpboot.c	smpboot: Remove cpumask from the API	2018-07-03 09:20:44 +02:00
smpboot.h
softirq.c	nohz: Fix missing tick reprogram when interrupting an inline softirq	2018-08-03 15:52:10 +02:00
stacktrace.c
stop_machine.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-08-13 11:25:07 -07:00
sys.c	kernel/sys.c: remove duplicated include	2018-09-20 22:01:11 +02:00
sys_ni.c	Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-10 10:17:09 -07:00
sysctl.c	sysctl: handle overflow for file-max	2019-04-05 22:32:57 +02:00
sysctl_binary.c	staging: irda: remove remaining remants of irda code removal	2018-04-16 11:26:49 +02:00
task_work.c
taskstats.c
test_kprobes.c	kprobes: Remove jprobe API implementation	2018-06-21 12:33:05 +02:00
torture.c	torture: Keep old-school dmesg format	2018-06-25 11:30:10 -07:00
tracepoint.c	tracepoint: Fix tracepoint array element size mismatch	2018-10-17 15:35:29 -04:00
tsacct.c
ucount.c	headers: untangle kmemleak.h from mm.h	2018-04-05 21:36:27 -07:00
uid16.c
uid16.h
umh.c	umh: fix race condition	2018-06-07 16:56:28 -04:00
up.c
user-return-notifier.c
user.c	userns: use irqsave variant of refcount_dec_and_lock()	2018-08-22 10:52:47 -07:00
user_namespace.c	userns: also map extents in the reverse map to kernel IDs	2018-11-13 11:09:00 -08:00
utsname.c	uts: create "struct uts_namespace" from kmem_cache	2018-04-11 10:28:35 -07:00
utsname_sysctl.c	sys: don't hold uts_sem while accessing userspace memory	2018-08-11 02:05:53 -05:00
watchdog.c	watchdog: Respect watchdog cpumask on CPU hotplug	2019-04-03 06:26:29 +02:00
watchdog_hld.c	watchdog: Mark watchdog touch functions as notrace	2018-08-30 12:56:40 +02:00
workqueue.c	watchdog: Mark watchdog touch functions as notrace	2018-08-30 12:56:40 +02:00
workqueue_internal.h	workqueue: Set worker->desc to workqueue name by default	2018-05-18 08:47:13 -07:00