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Xie XiuQi c9e5f60b6a sched/numa: Fix a possible divide-by-zero 
commit a860fa7b96 upstream.

sched_clock_cpu() may not be consistent between CPUs. If a task
migrates to another CPU, then se.exec_start is set to that CPU's
rq_clock_task() by update_stats_curr_start(). Specifically, the new
value might be before the old value due to clock skew.

So then if in numa_get_avg_runtime() the expression:

  'now - p->last_task_numa_placement'

ends up as -1, then the divider '*period + 1' in task_numa_placement()
is 0 and things go bang. Similar to update_curr(), check if time goes
backwards to avoid this.

[ peterz: Wrote new changelog. ]
[ mingo: Tweaked the code comment. ]

Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: cj.chengjian@huawei.com
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20190425080016.GX11158@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-02 09:32:01 +02:00
..
bpf
bpf: check pending signals while verifying programs
2018-12-21 14:11:38 +01:00
configs
…
debug
kdb: use memmove instead of overlapping memcpy
2018-12-08 13:05:05 +01:00
events
perf/core: Restore mmap record type correctly
2019-04-20 09:07:46 +02:00
gcov
…
irq
genirq: Respect IRQCHIP_SKIP_SET_WAKE in irq_chip_set_wake_parent()
2019-04-17 08:36:47 +02:00
livepatch
…
locking
Revert "locking/lockdep: Add debug_locks check in __lock_downgrade()"
2019-04-27 09:34:47 +02:00
power
PM / sleep: wakeup: Fix build error caused by missing SRCU support
2018-09-09 20:01:23 +02:00
printk
printk: Fix panic caused by passing log_buf_len to command line
2018-11-13 11:17:01 -08:00
rcu
rcu: Do RCU GP kthread self-wakeup from softirq and interrupt
2019-03-23 13:19:53 +01:00
sched
sched/numa: Fix a possible divide-by-zero
2019-05-02 09:32:01 +02:00
time
timekeeping: Use proper seqcount initializer
2019-02-12 19:44:54 +01:00
trace
trace: Fix preempt_enable_no_resched() abuse
2019-05-02 09:32:00 +02:00
.gitignore
…
acct.c
kernel/acct.c: fix the acct->needcheck check in check_free_space()
2018-01-10 09:29:51 +01:00
async.c
kernel/async.c: revert "async: simplify lowest_in_progress()"
2018-02-17 13:21:18 +01:00
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
audit: fix use-after-free in audit_add_watch
2018-09-26 08:36:37 +02:00
audit.c
audit: return on memory error to avoid null pointer dereference
2018-05-30 07:50:49 +02:00
audit.h
…
auditfilter.c
audit: allow not equal op for audit by executable
2018-08-03 07:55:25 +02:00
auditsc.c
audit: allow not equal op for audit by executable
2018-08-03 07:55:25 +02:00
backtracetest.c
…
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-13 11:16:57 -08:00
capability.c
…
cgroup_freezer.c
…
cgroup_pids.c
…
cgroup.c
cgroup: Fix deadlock in cpu hotplug path
2018-10-13 09:18:56 +02:00
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
cpu/hotplug: Prevent crash when CPU bringup fails on CONFIG_HOTPLUG_CPU=n
2019-04-03 06:24:19 +02:00
cpuset.c
…
crash_dump.c
…
cred.c
…
delayacct.c
…
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
kernel/exit.c: release ptraced tasks before zap_pid_ns_processes
2019-02-06 17:33:29 +01:00
extable.c
…
fork.c
fork: record start_time late
2019-01-13 10:03:51 +01:00
freezer.c
…
futex_compat.c
…
futex.c
futex: Ensure that futex address is aligned in handle_futex_death()
2019-03-27 14:13:03 +09:00
groups.c
kernel: make groups_sort calling a responsibility group_info allocators
2018-01-10 09:29:52 +01:00
hung_task.c
kernel: hung_task.c: disable on suspend
2019-04-20 09:07:52 +02:00
irq_work.c
…
jump_label.c
…
kallsyms.c
…
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: ensure irq code sees a valid area
2018-08-03 07:55:12 +02:00
kexec_core.c
objtool, x86: Add several functions and files to the objtool whitelist
2018-06-05 10:28:57 +02:00
kexec_file.c
…
kexec_internal.h
…
kexec.c
…
kmod.c
…
kprobes.c
kprobes: Fix error check when reusing optimized probes
2019-04-27 09:34:45 +02:00
ksysfs.c
…
kthread.c
kthread, tracing: Don't expose half-written comm when creating kthreads
2018-08-03 07:55:12 +02:00
latencytop.c
…
Makefile
…
membarrier.c
…
memremap.c
mm, devm_memremap_pages: kill mapping "System RAM" support
2019-01-13 10:03:51 +01:00
module_signing.c
…
module-internal.h
…
module.c
module: exclude SHN_UNDEF symbols from kallsyms api
2018-10-03 17:01:48 -07:00
notifier.c
…
nsproxy.c
…
padata.c
…
panic.c
panic: avoid deadlocks in re-entrant console drivers
2018-12-29 13:40:16 +01:00
params.c
…
pid_namespace.c
…
pid.c
pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()
2018-04-13 19:47:53 +02:00
profile.c
…
ptrace.c
…
range.c
…
reboot.c
…
relay.c
kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE
2018-05-30 07:50:29 +02:00
resource.c
resource: fix integer overflow at reallocation
2018-04-24 09:34:09 +02:00
seccomp.c
seccomp: Move speculation migitation control to arch code
2018-05-22 16:58:02 +02:00
signal.c
signal: Restore the stop PTRACE_EVENT_EXIT
2019-02-20 10:18:33 +01:00
smp.c
cpu/hotplug: Fix SMT supported evaluation
2018-08-15 18:14:53 +02:00
smpboot.c
…
smpboot.h
…
softirq.c
Mark HI and TASKLET softirq synchronous
2018-08-15 18:14:42 +02:00
stacktrace.c
…
stop_machine.c
stop_machine: Use raw spinlocks
2018-08-03 07:55:24 +02:00
sys_ni.c
…
sys.c
sys: don't hold uts_sem while accessing userspace memory
2018-09-09 20:01:24 +02:00
sysctl_binary.c
…
sysctl.c
kernel/sysctl.c: fix out-of-bounds access when setting file-max
2019-04-27 09:34:47 +02:00
task_work.c
…
taskstats.c
…
test_kprobes.c
…
torture.c
…
tracepoint.c
tracepoint: Do not warn on ENOMEM
2018-05-09 09:50:20 +02:00
tsacct.c
…
ucount.c
…
uid16.c
kernel: make groups_sort calling a responsibility group_info allocators
2018-01-10 09:29:52 +01:00
up.c
…
user_namespace.c
userns: move user access out of the mutex
2018-09-09 20:01:24 +02:00
user-return-notifier.c
…
user.c
…
utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-09-09 20:01:24 +02:00
utsname.c
…
watchdog_hld.c
…
watchdog.c
…
workqueue_internal.h
…
workqueue.c
workqueue: use put_device() instead of kfree()
2018-05-30 07:50:36 +02:00