John Stultz 27727df240 timekeeping: Avoid taking lock in NMI path with CONFIG_DEBUG_TIMEKEEPING ...

When I added some extra sanity checking in timekeeping_get_ns() under
CONFIG_DEBUG_TIMEKEEPING, I missed that the NMI safe __ktime_get_fast_ns()
method was using timekeeping_get_ns().

Thus the locking added to the debug checks broke the NMI-safety of
__ktime_get_fast_ns().

This patch open-codes the timekeeping_get_ns() logic for
__ktime_get_fast_ns(), so can avoid any deadlocks in NMI.

Fixes: 4ca22c2648f9 "timekeeping: Add warnings when overflows or underflows are observed"
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: stable <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/1471993702-29148-2-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2016-08-24 09:34:31 +02:00

..

bpf

bpf: fix bpf_skb_in_cgroup helper naming

2016-08-12 21:53:33 -07:00

configs

config: add android config fragments

2016-08-02 19:35:42 -04:00

debug

mm/init: Add 'rodata=off' boot cmdline parameter to disable read-only kernel mappings

2016-02-22 08:51:37 +01:00

events

perf/core: Check return value of the perf_event_read() IPI

2016-08-18 10:35:52 +02:00

gcov

gcov: add support for gcc version >= 6

2016-07-15 14:54:27 +09:00

irq

genirq/msi: Make sure PCI MSIs are activated early

2016-08-09 09:19:32 +02:00

livepatch

modules: add ro_after_init support

2016-08-04 10:16:55 +09:30

locking

locking/pvqspinlock: Fix a bug in qstat_read()

2016-08-10 14:13:29 +02:00

power

Merge branch 'pm-sleep'

2016-08-18 03:27:08 +02:00

printk

Revert "printk: create pr_<level> functions"

2016-08-09 10:48:18 -07:00

rcu

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

2016-07-29 13:55:30 -07:00

sched

sched/cputime: Resync steal time when guest & host lose sync

2016-08-18 11:19:48 +02:00

time

timekeeping: Avoid taking lock in NMI path with CONFIG_DEBUG_TIMEKEEPING

2016-08-24 09:34:31 +02:00

trace

block: rename bio bi_rw to bi_opf

2016-08-07 14:41:02 -06:00

.gitignore

certs: add .gitignore to stop git nagging about x509_certificate_list

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

acct.c

…

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

don't bother with ->d_inode->i_sb - it's always equal to ->d_sb

2016-04-10 17:11:51 -04:00

audit.c

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

2016-07-29 17:54:17 -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-4.8' of git://git.infradead.org/users/pcmoore/audit

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

backtracetest.c

…

bounds.c

…

capability.c

kernel: Add noaudit variant of ns_capable()

2016-06-06 20:16:18 +10:00

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: Use lld instead of ld when printing pids controller events_limit

2016-06-21 15:03:36 -04:00

cgroup.c

Merge branch 'for-4.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2016-07-29 14:29:04 -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

timers/core: Correct callback order during CPU hot plug

2016-07-28 18:56:22 +02:00

cpuset.c

cpuset, mm: fix TIF_MEMDIE check in cpuset_change_task_nodemask

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

crash_dump.c

…

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

…

exit.c

kernel/exit.c: quieten greatest stack depth printk

2016-08-02 19:35:23 -04:00

extable.c

kernel/extable.c: remove duplicated include

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

fork.c

mm: fix memcg stack accounting for sub-page stacks

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

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: Assume all mappings are private on !MMU systems

2016-07-29 18:44:14 +02:00

groups.c

…

hung_task.c

kernel/hung_task.c: use timeout diff when timeout is updated

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

irq_work.c

treewide: Remove old email address

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

jump_label.c

powerpc updates for 4.8 #2

2016-08-05 09:00:54 -04:00

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

kernel/kcov: unproxify debugfs file's fops

2016-06-15 04:56:35 -07:00

kexec_core.c

kexec: add restriction on kexec_load() segment sizes

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

kexec_file.c

kexec: introduce a protection mechanism for the crashkernel reserved memory

2016-05-23 17:04:14 -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

perf/x86/hw_breakpoints: Disallow kernel breakpoints unless kprobe-safe

2015-08-04 10:16:54 +02:00

ksysfs.c

kexec: add a kexec_crash_loaded() function

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

kthread.c

kernel/kthread.c:kthread_create_on_node(): clarify documentation

2015-09-04 16:54:41 -07:00

latencytop.c

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

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

Makefile

ELF/MIPS build fix

2016-05-23 17:04:14 -07:00

membarrier.c

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

memremap.c

libnvdimm for 4.8

2016-07-28 17:38:16 -07:00

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

Removed the MODULE_SIG_FORCE-means-no-MODULE_FORCE_LOAD patch.

2016-08-04 09:14:38 -04:00

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

kernel/padata.c: hide unused functions

2016-05-19 19:12:14 -07:00

panic.c

kexec: use core_param for crash_kexec_post_notifiers boot option

2016-08-02 19:35:29 -04:00

params.c

Nothing exciting, minor tweaks and cleanups.

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

pid_namespace.c

…

pid.c

remove lots of IS_ERR_VALUE abuses

2016-05-27 15:26:11 -07:00

profile.c

profile: Convert to hotplug state machine

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

ptrace.c

tree-wide: replace config_enabled() with IS_ENABLED()

2016-08-04 08:50:07 -04:00

range.c

…

reboot.c

kexec: split kexec_load syscall from kexec core code

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

relay.c

relay: add global mode support for buffer-only channels

2016-08-02 19:35:41 -04:00

resource.c

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

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

seccomp.c

tree-wide: replace config_enabled() with IS_ENABLED()

2016-08-04 08:50:07 -04:00

signal.c

signals: Use hrtimer for sigtimedwait()

2016-07-07 10:35:07 +02:00

smp.c

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

2016-07-29 13:55:30 -07:00

smpboot.c

cpu/hotplug: Unpark smpboot threads from the state machine

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

smpboot.h

cpu/hotplug: Create hotplug threads

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

softirq.c

arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections

2016-03-25 16:37:42 -07:00

stacktrace.c

…

stop_machine.c

stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE

2016-07-27 11:12:11 +02:00

sys_ni.c

vfs: add copy_file_range syscall and vfs helper

2015-12-01 14:00:53 -05:00

sys.c

prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable

2016-05-23 17:04:14 -07:00

sysctl_binary.c

kernel/sysctl_binary.c: use generic UUID library

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

sysctl.c

printk: add kernel parameter to control writes to /dev/kmsg

2016-08-02 19:35:06 -04:00

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: use the libnl API to align nlattr on 64-bit

2016-04-23 20:13:25 -04:00

test_kprobes.c

…

torture.c

torture: Stop onoff task if there is only one cpu

2016-06-14 16:03:28 -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

uid16.c

…

up.c

…

user_namespace.c

fs: Limit file caps to the user namespace of the super block

2016-06-24 10:40:31 -05:00

user-return-notifier.c

…

user.c

…

utsname_sysctl.c

…

utsname.c

…

watchdog.c

Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86"

2016-07-10 20:58:36 +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

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

2016-07-29 13:55:30 -07:00