John Ogness 09c5ba0aa2 printk: add kthread console printers ... Create a kthread for each console to perform console printing. During normal operation (@system_state == SYSTEM_RUNNING), the kthread printers are responsible for all printing on their respective consoles. During non-normal operation, console printing is done as it has been: within the context of the printk caller or within irqwork triggered by the printk caller, referred to as direct printing. Since threaded console printers are responsible for all printing during normal operation, this also includes messages generated via deferred printk calls. If direct printing is in effect during a deferred printk call, the queued irqwork will perform the direct printing. To make it clear that this is the only time that the irqwork will perform direct printing, rename the flag PRINTK_PENDING_OUTPUT to PRINTK_PENDING_DIRECT_OUTPUT. Threaded console printers synchronize against each other and against console lockers by taking the console lock for each message that is printed. Note that the kthread printers do not care about direct printing. They will always try to print if new records are available. They can be blocked by direct printing, but will be woken again once direct printing is finished. Console unregistration is a bit tricky because the associated kthread printer cannot be stopped while the console lock is held. A policy is implemented that states: whichever task clears con->thread (under the console lock) is responsible for stopping the kthread. unregister_console() will clear con->thread while the console lock is held and then stop the kthread after releasing the console lock. For consoles that have implemented the exit() callback, the kthread is stopped before exit() is called. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20220421212250.565456-14-john.ogness@linutronix.de		2022-04-22 21:30:58 +02:00
..
bpf	bpf: Add schedule points in batch ops	2022-02-17 10:48:26 -08:00
cgroup	Linux 5.17-rc8	2022-03-15 10:28:12 +01:00
configs	configs/debug: restore DEBUG_INFO=y for overriding	2022-03-17 11:02:13 -07:00
debug	kdb: Adopt scheduler's task classification	2021-11-03 17:21:37 +00:00
dma	cma: factor out minimum alignment requirement	2022-03-22 15:57:05 -07:00
entry	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
events	Folio changes for 5.18	2022-03-22 17:03:12 -07:00
futex	mm/truncate: Inline invalidate_complete_page() into its one caller	2022-03-21 12:59:01 -04:00
gcov	gcov: Remove compiler version check	2021-12-02 17:25:21 +09:00
irq	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
kcsan	KCSAN updates for v5.17	2022-01-11 09:51:26 -08:00
livepatch	Livepatching changes for 5.17	2022-01-16 10:08:13 +02:00
locking	Changes in this cycle were:	2022-03-22 13:44:21 -07:00
power	for-5.18/block-2022-03-18	2022-03-21 16:48:55 -07:00
printk	printk: add kthread console printers	2022-04-22 21:30:58 +02:00
rcu	printk: add functions to prefer direct printing	2022-04-22 21:30:58 +02:00
sched	Merge branch 'akpm' (patches from Andrew)	2022-03-22 16:11:53 -07:00
time	tick/rcu: Stop allowing RCU_SOFTIRQ in idle	2022-03-07 23:01:34 +01:00
trace	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
.gitignore
acct.c	kernel: remove spurious blkdev.h includes	2021-10-18 06:17:01 -06:00
async.c	Revert "module, async: async_synchronize_full() on module init iff async is used"	2022-02-03 11:20:34 -08:00
audit_fsnotify.c	fsnotify: clarify contract for create event hooks	2021-10-27 12:32:34 +02:00
audit_tree.c	audit: use struct_size() helper in kmalloc()	2021-12-14 17:39:42 -05:00
audit_watch.c	\n	2021-11-06 16:43:20 -07:00
audit.c	audit: improve audit queue handling when "audit=1" on cmdline	2022-01-25 13:22:51 -05:00
audit.h	audit: log AUDIT_TIME_* records only from rules	2022-02-22 13:51:40 -05:00
auditfilter.c	audit/stable-5.17 PR 20220110	2022-01-11 13:08:21 -08:00
auditsc.c	audit/stable-5.18 PR 20220321	2022-03-21 20:53:11 -07:00
backtracetest.c
bounds.c
capability.c
cfi.c	cfi: Use rcu_read_{un}lock_sched_notrace	2021-08-11 13:11:12 -07:00
compat.c	arch: remove compat_alloc_user_space	2021-09-08 15:32:35 -07:00
configs.c
context_tracking.c
cpu_pm.c	PM: cpu: Make notifier chain use a raw_spinlock_t	2021-08-16 18:55:32 +02:00
cpu.c	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
crash_core.c	kernel/crash_core: suppress unknown crashkernel parameter warning	2021-12-25 12:20:55 -08:00
crash_dump.c
cred.c	ucounts: Base set_cred_ucounts changes on the real user	2022-02-17 09:11:02 -06:00
delayacct.c	delayacct: track delays from memory compact	2022-01-20 08:52:55 +02:00
dma.c
exec_domain.c
exit.c	for-5.18/block-2022-03-18	2022-03-21 16:48:55 -07:00
extable.c	extable: use is_kernel_text() helper	2021-11-09 10:02:51 -08:00
fail_function.c
fork.c	Core code updates:	2022-03-21 12:37:33 -07:00
freezer.c	sched: Add get_current_state()	2021-06-18 11:43:08 +02:00
gen_kheaders.sh
groups.c
hung_task.c	printk: add functions to prefer direct printing	2022-04-22 21:30:58 +02:00
iomem.c
irq_work.c	irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ on PREEMPT_RT	2021-10-15 11:25:18 +02:00
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-05 10:46:20 +02:00
kallsyms.c	Livepatching changes for 5.17	2022-01-16 10:08:13 +02:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/rwlock: Provide RT variant	2021-08-17 17:50:51 +02:00
Kconfig.preempt	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
kcov.c	kcov: replace local_irq_save() with a local_lock_t	2021-11-09 10:02:52 -08:00
kexec_core.c	exit: Move oops specific logic from do_exit into make_task_dead	2021-12-13 12:04:45 -06:00
kexec_elf.c
kexec_file.c	memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED	2021-11-06 13:30:42 -07:00
kexec_internal.h
kexec.c	kexec: avoid compat_alloc_user_space	2021-09-08 15:32:34 -07:00
kheaders.c
kmod.c
kprobes.c	kprobe: move sysctl_kprobes_optimization to kprobes.c	2022-01-22 08:33:36 +02:00
ksysfs.c
kthread.c	sched/isolation: Use single feature type while referring to housekeeping cpumask	2022-02-16 15:57:55 +01:00
latencytop.c
Makefile	module: add in-kernel support for decompressing	2022-01-11 18:45:02 -08:00
module_decompress.c	module: fix building with sysfs disabled	2022-02-16 12:51:32 -08:00
module_signature.c
module_signing.c
module-internal.h	module: add in-kernel support for decompressing	2022-01-11 18:45:02 -08:00
module.c	NFSD: Remove svc_serv_ops::svo_module	2022-02-28 10:26:40 -05:00
notifier.c	notifier: Return an error when a callback has already been registered	2021-12-29 10:37:33 +01:00
nsproxy.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
padata.c	padata: replace cpumask_weight with cpumask_empty in padata.c	2022-01-31 11:21:46 +11:00
panic.c	printk: add functions to prefer direct printing	2022-04-22 21:30:58 +02:00
params.c	kobject: remove kset from struct kset_uevent_ops callbacks	2021-12-28 11:26:18 +01:00
pid_namespace.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
pid.c	pid: add pidfd_get_task() helper	2021-10-14 13:29:18 +02:00
profile.c	exit: Remove profile_handoff_task	2022-01-08 12:43:57 -06:00
ptrace.c	ptrace: Remove second setting of PT_SEIZED in ptrace_attach	2022-01-08 12:43:57 -06:00
range.c
reboot.c	printk: add functions to prefer direct printing	2022-04-22 21:30:58 +02:00
regset.c
relay.c
resource_kunit.c
resource.c	proc: remove PDE_DATA() completely	2022-01-22 08:33:37 +02:00
rseq.c	rseq: Remove broken uapi field layout on 32-bit little endian	2022-02-02 13:11:34 +01:00
scftorture.c	scftorture: Always log error message	2021-12-07 16:36:17 -08:00
scs.c	scs: Release kasan vmalloc poison in scs_free process	2021-09-30 09:37:27 +01:00
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2022-02-10 19:09:12 -08:00
signal.c	signal, x86: Delay calling signals in atomic on RT enabled kernels	2022-03-04 14:58:54 +01:00
smp.c	sched: Improve wake_up_all_idle_cpus() take #2	2021-10-22 15:32:46 +02:00
smpboot.c	smpboot: Replace deprecated CPU-hotplug functions.	2021-08-10 14:57:42 +02:00
smpboot.h
softirq.c	genirq, softirq: Use in_hardirq() instead of in_irq()	2022-02-02 21:34:19 +01:00
stackleak.c	gcc-plugins/stackleak: Use noinstr in favor of notrace	2022-02-03 17:02:21 -08:00
stacktrace.c	stacktrace: move filter_irq_stacks() to kernel/stacktrace.c	2021-11-06 13:30:43 -07:00
static_call.c	static_call: Fix static_call_text_reserved() vs __init	2021-07-05 10:46:33 +02:00
stop_machine.c
sys_ni.c	mm/mempolicy: wire up syscall set_mempolicy_home_node	2022-01-15 16:30:30 +02:00
sys.c	mm: refactor vm_area_struct::anon_vma_name usage code	2022-03-05 11:08:32 -08:00
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)	2022-03-22 16:11:53 -07:00
task_work.c
taskstats.c
torture.c	torture: Wake up kthreads after storing task_struct pointer	2022-02-01 17:24:39 -08:00
tracepoint.c	tracepoint: Fix kerneldoc comments	2021-08-16 11:39:51 -04:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-01-08 12:43:57 -06:00
ucount.c	ucounts: Handle wrapping in is_ucounts_overlimit	2022-02-17 09:11:57 -06:00
uid16.c
uid16.h
umh.c
up.c
user_namespace.c	ucounts: Fix systemd LimitNPROC with private users regression	2022-02-25 10:40:14 -06:00
user-return-notifier.c
user.c	fs/epoll: use a per-cpu counter for user's watches count	2021-09-08 11:50:27 -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_sysctl.c
utsname.c
watch_queue.c	watch_queue: Actually free the watch	2022-03-21 12:48:32 +00:00
watchdog_hld.c	printk: add functions to prefer direct printing	2022-04-22 21:30:58 +02:00
watchdog.c	printk: add functions to prefer direct printing	2022-04-22 21:30:58 +02:00
workqueue_internal.h	workqueue: Assign a color to barrier work items	2021-08-17 07:49:10 -10:00
workqueue.c	sched/isolation: Use single feature type while referring to housekeeping cpumask	2022-02-16 15:57:55 +01:00