Xie Yongji b4df458223 locking/rwsem: Fix (possible) missed wakeup ...

[ Upstream commit e158488be2 ]

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 17:57:05 +01:00

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bpf

bpf: check pending signals while verifying programs

2018-12-21 14:11:38 +01:00

configs

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debug

kdb: use memmove instead of overlapping memcpy

2018-12-08 13:05:05 +01:00

events

perf/x86: Add check_period PMU callback

2019-02-20 10:18:31 +01:00

gcov

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irq

genirq: Fix race on spurious interrupt detection

2018-11-13 11:17:01 -08:00

livepatch

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locking

locking/rwsem: Fix (possible) missed wakeup

2019-03-05 17:57:05 +01:00

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: Call touch_nmi_watchdog() while printing stall warnings

2018-05-30 07:50:50 +02:00

sched

sched/core: Allow __sched_setscheduler() in interrupts when PI is not used

2018-12-01 09:44:25 +01:00

time

timekeeping: Use proper seqcount initializer

2019-02-12 19:44:54 +01:00

trace

tracing: Use cpumask_available() to check if cpumask variable may be used

2019-02-27 10:07:02 +01:00

.gitignore

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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

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audit_tree.c

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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

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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

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bounds.c

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

2018-11-13 11:16:57 -08:00

capability.c

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cgroup_freezer.c

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cgroup_pids.c

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cgroup.c

cgroup: Fix deadlock in cpu hotplug path

2018-10-13 09:18:56 +02:00

compat.c

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configs.c

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context_tracking.c

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cpu_pm.c

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cpu.c

Revert "x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation"

2018-11-23 12:57:41 +01:00

cpuset.c

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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

kernel/exit.c: release ptraced tasks before zap_pid_ns_processes

2019-02-06 17:33:29 +01:00

extable.c

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fork.c

fork: record start_time late

2019-01-13 10:03:51 +01:00

freezer.c

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futex_compat.c

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futex.c

futex: futex_wake_op, do not fail on invalid op

2018-11-10 07:42:54 -08:00

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: break RCU locks based on jiffies

2019-02-12 19:44:59 +01:00

irq_work.c

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jump_label.c

jump_label: Invoke jump_label_test() via early_initcall()

2017-12-14 09:28:24 +01:00

kallsyms.c

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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

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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

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kexec_internal.h

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kexec.c

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kmod.c

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kprobes.c

kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()

2018-11-13 11:16:50 -08:00

ksysfs.c

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kthread.c

kthread, tracing: Don't expose half-written comm when creating kthreads

2018-08-03 07:55:12 +02:00

latencytop.c

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Makefile

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membarrier.c

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memremap.c

mm, devm_memremap_pages: kill mapping "System RAM" support

2019-01-13 10:03:51 +01:00

module_signing.c

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module-internal.h

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module.c

module: exclude SHN_UNDEF symbols from kallsyms api

2018-10-03 17:01:48 -07:00

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 13:40:16 +01:00

params.c

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pid_namespace.c

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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

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ptrace.c

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range.c

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reboot.c

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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

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smpboot.h

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softirq.c

Mark HI and TASKLET softirq synchronous

2018-08-15 18:14:42 +02:00

stacktrace.c

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stop_machine.c

stop_machine: Use raw spinlocks

2018-08-03 07:55:24 +02:00

sys_ni.c

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sys.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 20:01:24 +02:00

sysctl_binary.c

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sysctl.c

proc/sysctl: fix return error for proc_doulongvec_minmax()

2019-02-12 19:44:59 +01:00

task_work.c

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taskstats.c

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test_kprobes.c

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torture.c

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tracepoint.c

tracepoint: Do not warn on ENOMEM

2018-05-09 09:50:20 +02:00

tsacct.c

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ucount.c

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uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:29:52 +01:00

up.c

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user_namespace.c

userns: move user access out of the mutex

2018-09-09 20:01:24 +02:00

user-return-notifier.c

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user.c

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utsname_sysctl.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 20:01:24 +02:00

utsname.c

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watchdog_hld.c

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watchdog.c

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workqueue_internal.h

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workqueue.c

workqueue: use put_device() instead of kfree()

2018-05-30 07:50:36 +02:00