Abhilash Kesavan 3861f0b0f1 ANDROID: sched/walt: Fix divide by zero error in cpufreq notifier ...

On systems using ACPI cpufreq, at boot-time only CPU0 max_freq has been
populated when load_scale_factor/capacity recomputation is triggered on
all possible cpus. This leads to the following divide by zero panic when
rq->max_freq for any cpu other than CPU0 is accessed:

[    4.827597]  divide error: 0000 [#1] PREEMPT SMP
[    4.827604]  [<ffffffff862ad88e>] ? notifier_call_chain+0x37/0x57
[    4.827607]  [<ffffffff862adaf3>] ? __blocking_notifier_call_chain+0x46/0x5c
[    4.827611]  [<ffffffff8684b9f4>] ? cpufreq_set_policy+0xa6/0x2dc
[    4.827614]  [<ffffffff869e4d55>] ? cpufreq_init_policy+0xba/0xde
[    4.827617]  [<ffffffff8684bd4c>] ? cpufreq_update_policy+0x122/0x122
[    4.827620]  [<ffffffff8684c51c>] ? cpufreq_online+0x5a7/0x64e
[    4.827623]  [<ffffffff8684c63b>] ? cpufreq_add_dev+0x78/0xed
[    4.827627]  [<ffffffff866ce412>] ? subsys_interface_register+0xd6/0x117
[    4.827630]  [<ffffffff8684b410>] ? cpufreq_register_driver+0x168/0x2b2
[    4.827632]  [<ffffffff8684b410>] ? cpufreq_register_driver+0x168/0x2b2
[    4.827636]  [<ffffffff86f83b2e>] ? cpufreq_gov_dbs_init+0xc/0xc
[    4.827639]  [<ffffffff86f83d43>] ? acpi_cpufreq_init+0x215/0x282
[    4.827641]  [<ffffffff86f83b2e>] ? cpufreq_gov_dbs_init+0xc/0xc
[    4.827645]  [<ffffffff8620046e>] ? do_one_initcall+0x9c/0x12e
[    4.827649]  [<ffffffff86f3d058>] ? kernel_init_freeable+0x190/0x22b
[    4.827651]  [<ffffffff869e59d9>] ? rest_init+0x7c/0x7c
[    4.827653]  [<ffffffff869e59e3>] ? kernel_init+0xa/0xf3
[    4.827656]  [<ffffffff869ed482>] ? ret_from_fork+0x22/0x30

On ACPI based systems, for CPUs with uninitialized rq->max_freq skip the
re-calculation.

Reference discussion on a similar issue here:
https://www.spinics.net/lists/arm-kernel/msg557612.html

Change-Id: I5025e3f6db671e9e72369f85708d3b0482d5dad2
Signed-off-by: Abhilash Kesavan <abhilash.kesavan@intel.com>

2017-10-27 16:04:52 +00:00

..

bpf

Merge 4.9.55 into android-4.9

2017-10-12 22:31:24 +02:00

configs

ANDROID: add script to fetch android kernel config fragments

2017-10-03 17:19:26 +00:00

debug

Merge tag 'v4.9.6' into android-4.9

2017-01-31 13:55:27 -08:00

events

Merge 4.9.55 into android-4.9

2017-10-12 22:31:24 +02:00

gcov

gcov: support GCC 7.1

2017-09-02 07:07:53 +02:00

irq

genirq: Make sparse_irq_lock protect what it should protect

2017-10-05 09:43:58 +02:00

livepatch

livepatch/module: make TAINT_LIVEPATCH module-specific

2016-08-26 14:42:08 +02:00

locking

locking/lockdep: Add nest_lock integrity test

2017-10-21 17:21:33 +02:00

power

Merge 4.9.55 into android-4.9

2017-10-12 22:31:24 +02:00

printk

Merge branch 'upstream-linux-4.9.y' into android-4.9

2017-02-23 14:29:44 -08:00

rcu

rcu: Allow for page faults in NMI handlers

2017-10-18 09:35:38 +02:00

sched

ANDROID: sched/walt: Fix divide by zero error in cpufreq notifier

2017-10-27 16:04:52 +00:00

time

Merge 4.9.58 into android-4.9

2017-10-23 09:35:27 +02:00

trace

Merge 4.9.55 into android-4.9

2017-10-12 22:31:24 +02:00

.gitignore

certs: add .gitignore to stop git nagging about x509_certificate_list

2015-10-21 15:18:35 +01:00

acct.c

acct: check FMODE_CAN_WRITE

2015-04-11 22:27:55 -04:00

async.c

async: export current_is_async()

2015-11-19 17:51:48 +01:00

audit_fsnotify.c

wrappers for ->i_mutex access

2016-01-22 18:04:28 -05:00

audit_tree.c

audit: cleanup prune_tree_thread

2016-04-04 09:46:47 -04:00

audit_watch.c

audit: Fix use after free in audit_remove_watch_rule()

2017-08-24 17:12:18 -07:00

audit.c

Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit

2016-10-04 14:21:41 -07:00

audit.h

Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit

2016-07-29 17:54:17 -07:00

auditfilter.c

audit: add fields to exclude filter by reusing user filter

2016-06-27 11:01:00 -04:00

auditsc.c

Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit

2016-10-04 14:21:41 -07:00

backtracetest.c

…

bounds.c

page-cgroup: get rid of NR_PCG_FLAGS

2014-08-08 15:57:18 -07:00

capability.c

ptrace: Capture the ptracer's creds not PT_PTRACE_CAP

2017-01-06 10:40:13 +01:00

cgroup_freezer.c

cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends

2015-12-03 10:24:08 -05:00

cgroup_pids.c

cgroup/pids: remove spurious suspicious RCU usage warning

2017-03-26 13:05:58 +02:00

cgroup.c

Merge 4.9.42 into android-4.9

2017-08-11 13:55:02 -07:00

compat.c

compat: cleanup coding in compat_get_bitmap() and compat_put_bitmap()

2015-06-04 23:57:18 +02:00

configs.c

…

context_tracking.c

context_tracking: Switch to new static_branch API

2015-11-24 09:56:43 +01:00

cpu_pm.c

kernel/cpu_pm: fix cpu_cluster_pm_exit comment

2015-09-03 02:42:20 +02:00

cpu.c

Merge 4.9.41 into android-4.9

2017-08-07 14:21:32 -07:00

cpuset.c

Merge 4.9.55 into android-4.9

2017-10-12 22:31:24 +02:00

crash_dump.c

crash_dump: Make is_kdump_kernel() accessible from modules

2014-08-25 15:42:19 -07:00

cred.c

cred: Reject inodes with invalid ids in set_create_file_as()

2016-06-30 18:05:09 -05:00

delayacct.c

kmemcg: account certain kmem allocations to memcg

2016-01-14 16:00:49 -08:00

dma.c

…

elfcore.c

…

exec_domain.c

Remove rest of exec domains.

2015-04-12 21:03:31 +02:00

exit.c

ANDROID: FIXUP: sched/tune: fix accounting for runnable tasks

2017-01-31 10:46:56 -08:00

extable.c

kernel/extable.c: mark core_kernel_text notrace

2017-07-21 07:42:21 +02:00

fork.c

mm, uprobes: fix multiple free of ->uprobes_state.xol_area

2017-09-07 08:35:39 +02:00

freezer.c

freezer, oom: check TIF_MEMDIE on the correct task

2016-07-28 16:07:41 -07:00

futex_compat.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-01-20 17:09:18 -08:00

futex.c

futex: Remove unnecessary warning from get_futex_key

2017-08-16 13:43:15 -07:00

groups.c

cred: simpler, 1D supplementary groups

2016-10-07 18:46:30 -07:00

hung_task.c

hung_task: allow hung_task_panic when hung_task_warnings is 0

2016-10-11 15:06:33 -07:00

irq_work.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

jump_label.c

jump_labels: API for flushing deferred jump label updates

2017-01-19 20:17:59 +01:00

kallsyms.c

kallsyms: add support for relative offsets in kallsyms address table

2016-03-15 16:55:16 -07:00

kcmp.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-01-20 17:09:18 -08:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

locking/qrwlock: Rename QUEUE_RWLOCK to QUEUED_RWLOCKS

2015-05-12 09:46:00 +02:00

Kconfig.preempt

…

kcov.c

kcov: add missing #include <linux/sched.h>

2016-12-07 17:10:00 -08:00

kexec_core.c

kexec: add restriction on kexec_load() segment sizes

2016-08-02 19:35:31 -04:00

kexec_file.c

kexec: fix double-free when failing to relocate the purgatory

2016-09-01 17:52:01 -07:00

kexec_internal.h

kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE

2016-01-20 17:09:18 -08:00

kexec.c

kexec: allow architectures to override boot mapping

2016-08-02 19:35:27 -04:00

kmod.c

kmod: don't run async usermode helper as a child of kworker thread

2015-10-23 17:55:10 +09:00

kprobes.c

tracing/kprobes: Enforce kprobes teardown after testing

2017-05-25 15:44:47 +02:00

ksysfs.c

kexec: add a kexec_crash_loaded() function

2016-08-02 19:35:30 -04:00

kthread.c

cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups

2017-04-21 09:31:18 +02:00

latencytop.c

sched/debug: Make schedstats a runtime tunable that is disabled by default

2016-02-09 11:54:23 +01:00

Makefile

kernel/watchdog.c: move hardlockup detector to separate file

2017-06-17 06:41:57 +02:00

membarrier.c

Fix: Disable sys_membarrier when nohz_full is enabled

2017-03-12 06:41:45 +01:00

memremap.c

mm, devm_memremap_pages: hold device_hotplug lock over mem_hotplug_{begin, done}

2017-03-12 06:41:43 +01:00

module_signing.c

KEYS: Move the point of trust determination to __key_link()

2016-04-11 22:43:43 +01:00

module-internal.h

…

module.c

Re-enable CONFIG_MODVERSIONS in a slightly weaker form

2016-11-29 16:01:30 -08:00

notifier.c

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-09-01 08:40:25 -07:00

nsproxy.c

cgroup: introduce cgroup namespaces

2016-02-16 13:04:58 -05:00

padata.c

padata: free correct variable

2017-05-20 14:28:40 +02:00

panic.c

kernel/panic.c: add missing \n

2017-07-05 14:40:24 +02:00

params.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2015-11-09 15:53:39 -08:00

pid_namespace.c

pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes

2017-05-25 15:44:38 +02:00

pid.c

pids: make task_tgid_nr_ns() safe

2017-08-24 17:12:21 -07:00

profile.c

profile: Convert to hotplug state machine

2016-07-15 10:41:42 +02:00

ptrace.c

ptrace: Properly initialize ptracer_cred on fork

2017-06-14 15:05:54 +02:00

range.c

kernel: avoid overflow in cmp_range

2015-01-17 10:02:23 +13:00

reboot.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

relay.c

relay: check array offset before using it

2017-01-12 11:39:30 +01:00

resource.c

/proc/iomem: only expose physical resource addresses to privileged users

2016-04-14 12:56:09 -07:00

seccomp.c

seccomp: fix the usage of get/put_seccomp_filter() in seccomp_get_filter()

2017-10-05 09:44:02 +02:00

signal.c

signal: protect SIGNAL_UNKILLABLE from unintentional clearing.

2017-08-11 08:49:36 -07:00

smp.c

smp: Allocate smp_call_on_cpu() workqueue on stack too

2016-09-22 14:49:10 +02:00

smpboot.c

kthread/smpboot: do not park in kthread_create_on_cpu()

2016-10-11 15:06:33 -07:00

smpboot.h

cpu/hotplug: Create hotplug threads

2016-03-01 20:36:56 +01:00

softirq.c

softirq: Display IRQ_POLL for irq-poll statistics

2016-10-21 15:45:47 -06:00

stacktrace.c

stacktrace, lockdep: Fix address, newline ugliness

2017-02-14 15:25:42 -08:00

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_ni.c

x86/pkeys: Fix pkeys build breakage for some non-x86 arches

2016-09-13 14:41:36 +02:00

sys.c

ANDROID: mm: add a field to store names for private anonymous memory

2017-01-27 13:52:21 -08:00

sysctl_binary.c

kernel/sysctl_binary.c: use generic UUID library

2016-05-20 17:58:30 -07:00

sysctl.c

Merge 4.9.53 into android-4.9

2017-10-05 10:37:37 +02:00

task_work.c

task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works

2016-08-02 19:35:02 -04:00

taskstats.c

taskstats: fix the length of cgroupstats_cmd_get_policy

2016-11-03 16:55:58 -04:00

test_kprobes.c

kernel/test_kprobes.c: use current logging functions

2014-08-08 15:57:18 -07:00

torture.c

torture: Convert torture_shutdown() to hrtimer

2016-08-22 10:01:49 -07:00

tracepoint.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

tsacct.c

time, acct: Drop irq save & restore from __acct_update_integrals()

2016-02-29 09:53:09 +01:00

ucount.c

kernel/ucount.c: mark user_header with kmemleak_ignore()

2017-06-17 06:41:51 +02:00

uid16.c

cred: simpler, 1D supplementary groups

2016-10-07 18:46:30 -07:00

up.c

smp: Add function to execute a function synchronously on a CPU

2016-09-05 13:52:39 +02:00

user_namespace.c

Merge branch 'nsfs-ioctls' into HEAD

2016-09-22 20:00:36 -05:00

user-return-notifier.c

scheduler: Replace __get_cpu_var with this_cpu_ptr

2014-08-26 13:45:45 -04:00

user.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2014-12-17 12:31:40 -08:00

utsname_sysctl.c

…

utsname.c

Merge branch 'nsfs-ioctls' into HEAD

2016-09-22 20:00:36 -05:00

watchdog_hld.c

kernel/watchdog: prevent false hardlockup on overloaded system

2017-06-17 06:41:57 +02:00

watchdog.c

Revert "ANDROID: hardlockup: detect hard lockups without NMIs using secondary cpus"

2017-06-27 10:31:16 +02:00

workqueue_internal.h

sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()

2016-03-02 10:28:47 -05:00

workqueue.c

workqueue: implicit ordered attribute should be overridable

2017-08-11 08:49:37 -07:00