Xie Yongji 9ad6216e8c locking/rwsem: Fix (possible) missed wakeup ...

[ Upstream commit e158488be27b157802753a59b336142dc0eb0380 ]

Because wake_q_add() can imply an immediate wakeup (cmpxchg failure
case), we must not rely on the wakeup being delayed. However, commit:

  e38513905e ("locking/rwsem: Rework zeroing reader waiter->task")

relies on exactly that behaviour in that the wakeup must not happen
until after we clear waiter->task.

[ peterz: Added changelog. ]

Signed-off-by: Xie Yongji <xieyongji@baidu.com>
Signed-off-by: Zhang Yu <zhangyu31@baidu.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>
Fixes: e38513905e ("locking/rwsem: Rework zeroing reader waiter->task")
Link: https://lkml.kernel.org/r/1543495830-2644-1-git-send-email-xieyongji@baidu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2019-03-05 17:58:49 +01:00

..

bpf

bpf: zero out build_id for BPF_STACK_BUILD_ID_IP

2019-02-27 10:08:56 +01:00

cgroup

cgroup: fix parsing empty mount option string

2019-02-12 19:47:17 +01:00

configs

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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/x86: Add check_period PMU callback

2019-02-20 10:25:45 +01:00

gcov

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irq

genirq: Make sure the initial affinity is not empty

2019-03-05 17:58:47 +01:00

livepatch

Merge branch 'for-4.19/upstream' into for-linus

2018-08-20 18:33:50 +02:00

locking

locking/rwsem: Fix (possible) missed wakeup

2019-03-05 17:58:49 +01:00

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

srcu: Lock srcu_data structure in srcu_gp_start()

2019-01-13 09:51:06 +01:00

sched

sched/wake_q: Fix wakeup ordering for wake_q

2019-03-05 17:58:49 +01:00

time

timekeeping: Use proper seqcount initializer

2019-02-12 19:47:05 +01:00

trace

tracing: Fix number of entries in trace header

2019-02-27 10:08:49 +01:00

.gitignore

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acct.c

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async.c

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audit_fsnotify.c

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audit_tree.c

Merge tag 'fsnotify_for_v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

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

audit.c

audit: use ktime_get_coarse_real_ts64() for timestamps

2018-07-17 14:45:08 -04:00

audit.h

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auditfilter.c

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auditsc.c

Merge tag 'audit-pr-20180814' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

2018-08-15 10:46:54 -07:00

backtracetest.c

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bounds.c

kbuild: fix kernel/bounds.c 'W=1' warning

2018-11-13 11:08:47 -08:00

capability.c

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compat.c

time: Enable get/put_compat_itimerspec64 always

2018-06-24 14:39:47 +02:00

configs.c

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context_tracking.c

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cpu_pm.c

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cpu.c

cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM

2019-02-12 19:47:25 +01:00

crash_core.c

kernel/crash_core.c: print timestamp using time64_t

2018-08-22 10:52:47 -07:00

crash_dump.c

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cred.c

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delayacct.c

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dma.c

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elfcore.c

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exec_domain.c

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exit.c

sched/wait: Fix rcuwait_wake_up() ordering

2019-03-05 17:58:49 +01:00

extable.c

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fail_function.c

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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_compat.c

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futex.c

futex: Fix (possible) missed wakeup

2019-03-05 17:58:49 +01:00

groups.c

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hung_task.c

kernel/hung_task.c: force console verbose before panic

2019-02-12 19:47:19 +01:00

iomem.c

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irq_work.c

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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

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Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

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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_core.c

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kexec_file.c

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kexec_internal.h

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kexec.c

kexec: add call to LSM hook in original kexec_load syscall

2018-07-16 12:31:57 -07:00

kmod.c

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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

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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

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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_signing.c

modsign: log module name in the event of an error

2018-07-02 11:36:17 +02:00

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

notifier.c

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nsproxy.c

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padata.c

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panic.c

panic: avoid deadlocks in re-entrant console drivers

2018-12-29 13:37:57 +01:00

params.c

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pid_namespace.c

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pid.c

Fix failure path in alloc_pid()

2019-01-13 09:51:06 +01:00

profile.c

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ptrace.c

ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS

2018-12-05 19:32:03 +01:00

range.c

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reboot.c

PM / reboot: Eliminate race between reboot and suspend

2018-08-06 12:35:20 +02:00

relay.c

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resource.c

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rseq.c

rseq: uapi: Declare rseq_cs field as union, update includes

2018-07-10 22:18:52 +02:00

seccomp.c

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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

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softirq.c

nohz: Fix missing tick reprogram when interrupting an inline softirq

2018-08-03 15:52:10 +02:00

stacktrace.c

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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_ni.c

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sys.c

kernel/sys.c: remove duplicated include

2018-09-20 22:01:11 +02:00

sysctl_binary.c

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sysctl.c

proc/sysctl: fix return error for proc_doulongvec_minmax()

2019-02-12 19:47:19 +01:00

task_work.c

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taskstats.c

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test_kprobes.c

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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

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ucount.c

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uid16.c

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uid16.h

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umh.c

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up.c

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user_namespace.c

userns: also map extents in the reverse map to kernel IDs

2018-11-13 11:09:00 -08:00

user-return-notifier.c

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user.c

userns: use irqsave variant of refcount_dec_and_lock()

2018-08-22 10:52:47 -07:00

utsname_sysctl.c

sys: don't hold uts_sem while accessing userspace memory

2018-08-11 02:05:53 -05:00

utsname.c

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watchdog_hld.c

watchdog: Mark watchdog touch functions as notrace

2018-08-30 12:56:40 +02:00

watchdog.c

watchdog: Mark watchdog touch functions as notrace

2018-08-30 12:56:40 +02:00

workqueue_internal.h

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workqueue.c

watchdog: Mark watchdog touch functions as notrace

2018-08-30 12:56:40 +02:00