Thomas Gleixner f6f4ec00b5 futex: Clarify futex_requeue() PI handling ... When requeuing to a PI futex, then the requeue code tries to trylock the PI futex on behalf of the topmost waiter on the inner 'waitqueue' futex. If that succeeds, then PI state has to be allocated in order to requeue further waiters to the PI futex. The comment and the code are confusing, as the PI state allocation uses lookup_pi_state(), which either attaches to an existing waiter or to the owner. As the PI futex was just acquired, there cannot be a waiter on the PI futex because the hash bucket lock is held. Clarify the comment and use attach_to_pi_owner() directly. As the task on which behalf the PI futex has been acquired is guaranteed to be alive and not exiting, this call must succeed. Add a WARN_ON() in case that fails. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210815211305.305142462@linutronix.de		2021-08-17 19:05:41 +02:00
..
bpf	bpf, core: Fix kernel-doc notation	2021-08-10 13:09:28 +02:00
cgroup	cgroup: rstat: fix A-A deadlock on 32bit around u64_stats_sync	2021-07-27 13:12:20 -10:00
configs	drivers/char: remove /dev/kmem for good	2021-05-07 00:26:34 -07:00
debug	kernel: debug: Fix unreachable code in gdb_serial_stub()	2021-07-12 11:03:35 -05:00
dma	dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable}	2021-07-16 11:30:26 +02:00
entry	tick/nohz: Only check for RCU deferred wakeup on user/guest entry when needed	2021-05-31 10:14:49 +02:00
events	perf: Refactor permissions check into perf_check_permission()	2021-07-16 18:46:38 +02:00
gcov	Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR	2021-06-22 11:07:18 -07:00
irq	genirq/msi: Ensure deactivation on teardown	2021-08-10 15:55:19 +02:00
kcsan	Merge branch 'kcsan.2021.05.18a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu	2021-07-04 12:29:16 -07:00
livepatch	Livepatching changes for 5.13	2021-04-27 18:14:38 -07:00
locking	locking/rtmutex: Add mutex variant for RT	2021-08-17 19:05:29 +02:00
power	PM: hibernate: disable when there are active secretmem users	2021-07-08 11:48:21 -07:00
printk	printk changes for 5.14	2021-06-29 12:07:18 -07:00
rcu	locking/rtmutex: Split out the inner parts of 'struct rtmutex'	2021-08-17 17:04:01 +02:00
sched	sched/core: Provide a scheduling point for RT locks	2021-08-17 16:57:17 +02:00
time	timers: Move clearing of base::timer_running under base:: Lock	2021-07-27 20:57:44 +02:00
trace	bpf: Add lockdown check for probe_write_user helper	2021-08-10 10:10:10 +02:00
.gitignore	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
acct.c	kernel/acct.c: use #elif instead of #end and #elif	2020-12-15 22:46:15 -08:00
async.c	kernel/async.c: remove async_unregister_domain()	2021-05-07 00:26:33 -07:00
audit.c	lsm: separate security_task_getsecid() into subjective and objective variants	2021-03-22 15:23:32 -04:00
audit.h	audit: remove trailing spaces and tabs	2021-06-10 20:59:05 -04:00
audit_fsnotify.c	audit_alloc_mark(): don't open-code ERR_CAST()	2021-02-23 10:25:27 -05:00
audit_tree.c	audit: Use list_move instead of list_del/list_add	2021-06-08 22:18:35 -04:00
audit_watch.c	fsnotify: generalize handle_inode_event()	2020-12-03 14:58:35 +01:00
auditfilter.c	lsm: separate security_task_getsecid() into subjective and objective variants	2021-03-22 15:23:32 -04:00
auditsc.c	audit: remove trailing spaces and tabs	2021-06-10 20:59:05 -04:00
backtracetest.c
bounds.c
capability.c	capability: handle idmapped mounts	2021-01-24 14:27:16 +01:00
cfi.c	add support for Clang CFI	2021-04-08 16:04:20 -07:00
compat.c
configs.c
context_tracking.c
cpu.c	A fix for the CPU hotplug and cpusets interaction:	2021-06-29 12:23:02 -07:00
cpu_pm.c
crash_core.c	kdump: use vmlinux_build_id to simplify	2021-07-08 11:48:22 -07:00
crash_dump.c
cred.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-06-28 20:39:26 -07:00
delayacct.c	delayacct: Add sysctl to enable at runtime	2021-05-12 11:43:25 +02:00
dma.c
exec_domain.c
exit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-06-28 20:39:26 -07:00
extable.c
fail_function.c	fault-injection: handle EI_ETYPE_TRUE	2020-12-15 22:46:19 -08:00
fork.c	Merge branch 'akpm' (patches from Andrew)	2021-06-29 17:29:11 -07:00
freezer.c	sched: Add get_current_state()	2021-06-18 11:43:08 +02:00
futex.c	futex: Clarify futex_requeue() PI handling	2021-08-17 19:05:41 +02:00
gen_kheaders.sh	kbuild: clean up ${quiet} checks in shell scripts	2021-05-27 04:01:50 +09:00
groups.c	groups: simplify struct group_info allocation	2021-02-26 09:41:03 -08:00
hung_task.c	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00
iomem.c
irq_work.c	irq_work: Make irq_work_queue() NMI-safe again	2021-06-10 10:00:08 +02:00
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-05 10:46:20 +02:00
kallsyms.c	module: add printk formats to add module build ID to stacktraces	2021-07-08 11:48:22 -07:00
kcmp.c	Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2020-12-15 19:36:48 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/rwlock: Provide RT variant	2021-08-17 17:50:51 +02:00
Kconfig.preempt	sched/core: Disable CONFIG_SCHED_CORE by default	2021-06-28 22:43:05 +02:00
kcov.c	kernel: make kcov_common_handle consider the current context	2020-11-02 18:00:20 -08:00
kexec.c
kexec_core.c	kernel.h: split out panic and oops helpers	2021-07-01 11:06:04 -07:00
kexec_elf.c
kexec_file.c	kernel: kexec_file: fix error return code of kexec_calculate_store_digests()	2021-05-07 00:26:32 -07:00
kexec_internal.h	kexec: move machine_kexec_post_load() to public interface	2021-02-22 12:33:26 +00:00
kheaders.c
kmod.c	modules: add CONFIG_MODPROBE_PATH	2021-05-07 00:26:33 -07:00
kprobes.c	Locking fixes:	2021-07-11 11:06:09 -07:00
ksysfs.c
kthread.c	Merge branch 'akpm' (patches from Andrew)	2021-06-29 17:29:11 -07:00
latencytop.c
Makefile	kbuild: update config_data.gz only when the content of .config is changed	2021-05-02 00:43:35 +09:00
module-internal.h
module.c	module: add printk formats to add module build ID to stacktraces	2021-07-08 11:48:22 -07:00
module_signature.c	module: harden ELF info handling	2021-01-19 10:24:45 +01:00
module_signing.c	module: harden ELF info handling	2021-01-19 10:24:45 +01:00
notifier.c
nsproxy.c	fixes-v5.11	2020-12-14 16:40:27 -08:00
padata.c
panic.c	kernel.h: split out panic and oops helpers	2021-07-01 11:06:04 -07:00
params.c	Modules updates for v5.11	2020-12-17 13:01:31 -08:00
pid.c	Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2020-12-15 19:36:48 -08:00
pid_namespace.c	fixes-v5.11	2020-12-14 16:40:27 -08:00
profile.c	kernel: Initialize cpumask before parsing	2021-04-10 13:35:54 +02:00
ptrace.c	sched: Change task_struct::state	2021-06-18 11:43:09 +02:00
range.c	kernel.h: split out min()/max() et al. helpers	2020-10-16 11:11:19 -07:00
reboot.c	reboot: Add hardware protection power-off	2021-06-21 13:08:36 +01:00
regset.c
relay.c	relay: allow the use of const callback structs	2020-12-15 22:46:18 -08:00
resource.c	kernel/resource: fix return code check in __request_free_mem_region	2021-05-14 19:41:32 -07:00
resource_kunit.c	resource: provide meaningful MODULE_LICENSE() in test suite	2020-11-25 18:52:35 +01:00
rseq.c	rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs()	2021-04-14 18:04:09 +02:00
scftorture.c	scftorture: Avoid false-positive warnings in scftorture_invoker()	2021-07-06 12:37:55 -07:00
scs.c	scs: switch to vmapped shadow stacks	2020-12-01 10:30:28 +00:00
seccomp.c	seccomp: Fix setting loaded filter count during TSYNC	2021-08-11 11:48:28 -07:00
signal.c	Fix UCOUNT_RLIMIT_SIGPENDING counter leak	2021-07-08 11:43:24 -07:00
smp.c	smp: Fix smp_call_function_single_async prototype	2021-05-06 15:33:49 +02:00
smpboot.c	smpboot: fix duplicate and misplaced inlining directive	2021-07-25 11:06:37 -07:00
smpboot.h
softirq.c	sched: Introduce task_is_running()	2021-06-18 11:43:07 +02:00
stackleak.c
stacktrace.c
static_call.c	static_call: Fix static_call_text_reserved() vs __init	2021-07-05 10:46:33 +02:00
stop_machine.c	stop_machine: Add caller debug info to queue_stop_cpus_work	2021-03-23 16:01:58 +01:00
sys.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-06-28 20:39:26 -07:00
sys_ni.c	mm: introduce memfd_secret system call to create "secret" memory areas	2021-07-08 11:48:21 -07:00
sysctl-test.c	kernel/sysctl-test: Remove some casts which are no-longer required	2021-06-23 16:41:24 -06:00
sysctl.c	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00
task_work.c	kasan: record task_work_add() call stack	2021-04-30 11:20:42 -07:00
taskstats.c	treewide: rename nla_strlcpy to nla_strscpy.	2020-11-16 08:08:54 -08:00
test_kprobes.c
torture.c	torture: Replace torture_init_begin string with %s	2021-03-08 14:22:28 -08:00
tracepoint.c	tracepoint: Use rcu get state and cond sync for static call updates	2021-08-06 10:54:41 -04:00
tsacct.c
ucount.c	ucounts: add missing data type changes	2021-08-09 15:45:02 -05:00
uid16.c
uid16.h
umh.c	kernel/umh.c: fix some spelling mistakes	2021-05-07 00:26:34 -07:00
up.c	A set of locking related fixes and updates:	2021-05-09 13:07:03 -07:00
user-return-notifier.c
user.c	Reimplement RLIMIT_MEMLOCK on top of ucounts	2021-04-30 14:14:02 -05:00
user_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-06-28 20:39:26 -07:00
usermode_driver.c	Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2021-07-03 11:41:14 -07:00
utsname.c
utsname_sysctl.c
watch_queue.c	watch_queue: rectify kernel-doc for init_watch()	2021-01-26 11:16:34 +00:00
watchdog.c	kernel: watchdog: modify the explanation related to watchdog thread	2021-06-29 10:53:46 -07:00
watchdog_hld.c
workqueue.c	workqueue: fix UAF in pwq_unbound_release_workfn()	2021-07-21 06:42:31 -10:00
workqueue_internal.h