Paul E. McKenney b5ea03709d rcu: Clear ->core_needs_qs at GP end or self-reported QS ... The rcu_data structure's ->core_needs_qs field does not necessarily get cleared in a timely fashion after the corresponding CPUs' quiescent state has been reported. From a functional viewpoint, no harm done, but this can result in excessive invocation of RCU core processing, as witnessed by the kernel test robot, which saw greatly increased softirq overhead. This commit therefore restores the rcu_report_qs_rdp() function's clearing of this field, but only when running on the corresponding CPU. Cases where some other CPU reports the quiescent state (for example, on behalf of an idle CPU) are handled by setting this field appropriately within the __note_gp_changes() function's end-of-grace-period checks. This handling is carried out regardless of whether the end of a grace period actually happened, thus handling the case where a CPU goes non-idle after a quiescent state is reported on its behalf, but before the grace period ends. This fix also avoids cross-CPU updates to ->core_needs_qs, While in the area, this commit changes the __note_gp_changes() need_gp variable's name to need_qs because it is a quiescent state that is needed from the CPU in question. Fixes: ed93dfc6bc ("rcu: Confine ->core_needs_qs accesses to the corresponding CPU") Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>		2020-02-20 16:00:20 -08:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-02-08 17:15:08 -08:00
cgroup	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
configs
debug	Revert "kdb: Get rid of confusing diag msg from "rd" if current task has no regs"	2020-02-06 11:40:09 +00:00
dma	lib/genalloc.c: rename addr_in_gen_pool to gen_pool_has_addr	2019-12-04 19:44:13 -08:00
events	A set of fixes and improvements for the perf subsystem:	2020-02-09 12:04:09 -08:00
gcov	Revert "um: Enable CONFIG_CONSTRUCTORS"	2020-01-19 22:42:06 +01:00
irq	A set of fixes for X86:	2020-02-09 12:11:12 -08:00
livepatch	New tracing features:	2019-11-27 11:42:01 -08:00
locking	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
power	Merge back new material related to system-wide PM for v5.6.	2020-01-23 16:00:56 +01:00
printk	printk: fix exclusive_console replaying	2020-01-02 16:15:04 +01:00
rcu	rcu: Clear ->core_needs_qs at GP end or self-reported QS	2020-02-20 16:00:20 -08:00
sched	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
time	Two small fixes for the time(r) subsystem:	2020-02-09 12:00:12 -08:00
trace	Tracing updates:	2020-02-06 07:12:11 +00:00
.gitignore
acct.c	acct: stop using get_seconds()	2019-12-18 18:07:31 +01:00
async.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
audit_fsnotify.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00
audit_tree.c
audit_watch.c	audit_get_nd(): don't unlock parent too early	2019-11-10 11:56:55 -05:00
audit.c	audit: Add __rcu annotation to RCU pointer	2019-12-09 15:19:03 -05:00
audit.h	audit/stable-5.3 PR 20190702	2019-07-08 18:55:42 -07:00
auditfilter.c	audit/stable-5.3 PR 20190702	2019-07-08 18:55:42 -07:00
auditsc.c	Revert "bpf: Emit audit messages upon successful prog load and unload"	2019-11-23 09:56:02 -08:00
backtracetest.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
bounds.c
capability.c
compat.c	y2038: itimer: compat handling to itimer.c	2019-11-15 14:38:30 +01:00
configs.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
context_tracking.c	context_tracking: Rename context_tracking_is_enabled() => context_tracking_enabled()	2019-10-29 10:01:12 +01:00
cpu_pm.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282	2019-06-05 17:36:37 +02:00
cpu.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2020-01-28 10:07:09 -08:00
crash_core.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230	2019-06-19 17:09:06 +02:00
crash_dump.c
cred.c	Merge branch 'dhowells' (patches from DavidH)	2020-01-14 09:56:31 -08:00
delayacct.c
dma.c
elfcore.c	kernel/elfcore.c: include proper prototypes	2019-09-25 17:51:39 -07:00
exec_domain.c
exit.c	for-linus-2020-01-03	2020-01-03 11:17:14 -08:00
extable.c	bpf: Allow to resolve bpf trampoline and dispatcher in unwind	2020-01-25 07:12:40 -08:00
fail_function.c	fail_function: no need to check return value of debugfs_create functions	2019-06-03 15:49:06 +02:00
fork.c	hmm related patches for 5.6	2020-01-29 19:56:50 -08:00
freezer.c	Revert "libata, freezer: avoid block device removal while system is frozen"	2019-10-06 09:11:37 -06:00
futex.c	futex: Fix kernel-doc notation warning	2020-01-09 13:23:40 +01:00
gen_kheaders.sh	kheaders: explain why include/config/autoconf.h is excluded from md5sum	2019-11-11 20:10:01 +09:00
groups.c
hung_task.c
iomem.c	mm/nvdimm: add is_ioremap_addr and use that to check ioremap address	2019-07-12 11:05:40 -07:00
irq_work.c	irq_work: Fix IRQ_WORK_BUSY bit clearing	2019-11-15 10:48:37 +01:00
jump_label.c	jump_label: Don't warn on __exit jump entries	2019-08-29 15:10:10 +01:00
kallsyms.c	Kbuild updates for v5.6 (2nd)	2020-02-09 16:05:50 -08:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	sched/rt, locking: Use CONFIG_PREEMPTION	2019-12-08 14:37:36 +01:00
Kconfig.preempt	sched/Kconfig: Fix spelling mistake in user-visible help text	2019-11-12 11:35:32 +01:00
kcov.c	kcov: remote coverage support	2019-12-04 19:44:14 -08:00
kexec_core.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec_elf.c	kexec_elf: support 32 bit ELF files	2019-09-06 23:58:44 +02:00
kexec_file.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec_internal.h	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kheaders.c
kmod.c
kprobes.c	kprobes: Fix optimize_kprobe()/unoptimize_kprobe() cancellation logic	2020-01-09 12:40:13 +01:00
ksysfs.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 170	2019-05-30 11:26:39 -07:00
kthread.c	kthread: make __kthread_queue_delayed_work static	2019-10-16 09:20:58 -07:00
latencytop.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
Makefile	kcov: ignore fault-inject and stacktrace	2020-01-31 10:30:41 -08:00
module_signature.c	MODSIGN: Export module signature definitions	2019-08-05 18:39:56 -04:00
module_signing.c	MODSIGN: Export module signature definitions	2019-08-05 18:39:56 -04:00
module-internal.h
module.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
notifier.c	kernel/notifier.c: remove blocking_notifier_chain_cond_register()	2019-12-04 19:44:12 -08:00
nsproxy.c	ns: Introduce Time Namespace	2020-01-14 12:20:48 +01:00
padata.c	padata: update documentation	2019-12-11 16:37:02 +08:00
panic.c	locking/refcount: Remove unused 'refcount_error_report()' function	2019-11-25 09:15:42 +01:00
params.c	lockdown: Lock down module params that specify hardware parameters (eg. ioport)	2019-08-19 21:54:16 -07:00
pid_namespace.c	fork: extend clone3() to support setting a PID	2019-11-15 23:49:22 +01:00
pid.c	pid: Implement pidfd_getfd syscall	2020-01-13 21:49:36 +01:00
profile.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
ptrace.c	ptrace: reintroduce usage of subjective credentials in ptrace_has_cap()	2020-01-18 13:51:39 +01:00
range.c
reboot.c
relay.c
resource.c	mm/memory_hotplug.c: use PFN_UP / PFN_DOWN in walk_system_ram_range()	2019-09-24 15:54:09 -07:00
rseq.c	rseq: Reject unknown flags on rseq unregister	2019-12-25 10:41:20 +01:00
seccomp.c	seccomp: Check that seccomp_notif is zeroed out by the user	2020-01-02 13:03:45 -08:00
signal.c	sched.h: Annotate sighand_struct with __rcu	2020-01-26 10:54:47 +01:00
smp.c	smp: Remove superfluous cond_func check in smp_call_function_many_cond()	2020-01-28 15:43:00 +01:00
smpboot.c
smpboot.h
softirq.c	Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-07-08 11:01:13 -07:00
stackleak.c
stacktrace.c	stacktrace: Get rid of unneeded '!!' pattern	2019-11-11 10:30:59 +01:00
stop_machine.c	stop_machine: Make stop_cpus() static	2020-01-17 10:19:21 +01:00
sys_ni.c	y2038: allow disabling time32 system calls	2019-11-15 14:38:30 +01:00
sys.c	prctl: PR_{G,S}ET_IO_FLUSHER to support controlling memory reclaim	2020-01-28 10:09:51 +01:00
sysctl_binary.c	sysctl: Remove the sysctl system call	2019-11-26 13:03:56 -06:00
sysctl-test.c	kunit: allow kunit tests to be loaded as a module	2020-01-09 16:42:29 -07:00
sysctl.c	rcu: Make PREEMPT_RCU be a modifier to TREE_RCU	2019-12-09 12:37:51 -08:00
task_work.c
taskstats.c	taskstats: fix data-race	2019-12-04 15:18:39 +01:00
test_kprobes.c
torture.c	torture: Remove exporting of internal functions	2019-08-01 14:30:22 -07:00
tracepoint.c	The main changes in this release include:	2019-07-18 11:51:00 -07:00
tsacct.c	tsacct: add 64-bit btime field	2019-12-18 18:07:31 +01:00
ucount.c	proc/sysctl: add shared variables for range check	2019-07-18 17:08:07 -07:00
uid16.c
uid16.h
umh.c
up.c	smp/up: Make smp_call_function_single() match SMP semantics	2020-02-07 15:34:12 +01:00
user_namespace.c	Keyrings namespacing	2019-07-08 19:36:47 -07:00
user-return-notifier.c
user.c	Keyrings namespacing	2019-07-08 19:36:47 -07:00
utsname_sysctl.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
utsname.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
watchdog_hld.c
watchdog.c	watchdog/softlockup: Enforce that timestamp is valid on boot	2020-01-17 11:19:22 +01:00
workqueue_internal.h
workqueue.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2020-01-28 10:07:09 -08:00