Sergey Senozhatsky 6b97a20d3a printk: set may_schedule for some of console_trylock() callers ... console_unlock() allows to cond_resched() if its caller has set `console_may_schedule' to 1, since 8d91f8b153 ("printk: do cond_resched() between lines while outputting to consoles"). The rules are: -- console_lock() always sets `console_may_schedule' to 1 -- console_trylock() always sets `console_may_schedule' to 0 However, console_trylock() callers (among them is printk()) do not always call printk() from atomic contexts, and some of them can cond_resched() in console_unlock(), so console_trylock() can set `console_may_schedule' to 1 for such processes. For !CONFIG_PREEMPT_COUNT kernels, however, console_trylock() always sets `console_may_schedule' to 0. It's possible to drop explicit preempt_disable()/preempt_enable() in vprintk_emit(), because console_unlock() and console_trylock() are now smart enough: a) console_unlock() does not cond_resched() when it's unsafe (console_trylock() takes care of that) b) console_unlock() does can_use_console() check. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: Jan Kara <jack@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Kyle McMartin <kyle@kernel.org> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Calvin Owens <calvinowens@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-03-17 15:09:34 -07:00
..
bpf	bpf: fix branch offset adjustment on backjumps after patching ctx expansion	2016-02-10 16:56:47 -05:00
configs	…
debug	mm/init: Add 'rodata=off' boot cmdline parameter to disable read-only kernel mappings	2016-02-22 08:51:37 +01:00
events	Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-15 09:32:27 -07:00
gcov	…
irq	Power management and ACPI material for v4.6-rc1, part 1	2016-03-16 14:10:53 -07:00
livepatch	…
locking	tags: Fix DEFINE_PER_CPU expansions	2016-03-15 16:55:16 -07:00
power	Power management and ACPI material for v4.6-rc1, part 1	2016-03-16 14:10:53 -07:00
printk	printk: set may_schedule for some of console_trylock() callers	2016-03-17 15:09:34 -07:00
rcu	Merge branch 'akpm' (patches from Andrew)	2016-03-16 11:51:08 -07:00
sched	Power management and ACPI material for v4.6-rc1, part 1	2016-03-16 14:10:53 -07:00
time	timer: convert timer_slack_ns from unsigned long to u64	2016-03-17 15:09:34 -07:00
trace	Power management and ACPI material for v4.6-rc1, part 1	2016-03-16 14:10:53 -07:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	…
Kconfig.preempt	…
Makefile	…
acct.c	…
async.c	…
audit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2016-01-17 19:13:15 -08:00
audit.h	…
audit_fsnotify.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
audit_tree.c	…
audit_watch.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
auditfilter.c	…
auditsc.c	…
backtracetest.c	…
bounds.c	…
capability.c	…
cgroup.c	cgroup: make sure a parent css isn't freed before its children	2016-01-22 10:42:58 -05:00
cgroup_freezer.c	…
cgroup_pids.c	…
compat.c	…
configs.c	…
context_tracking.c	…
cpu.c	cpu/hotplug: Document states better	2016-03-12 20:57:38 +01:00
cpu_pm.c	…
cpuset.c	cpuset: make mm migration asynchronous	2016-01-22 10:22:46 -05:00
crash_dump.c	…
cred.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
delayacct.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	exit: remove unneeded declaration of exit_mm()	2016-01-20 17:09:18 -08:00
extable.c	…
fork.c	mm: memcontrol: report kernel stack usage in cgroup2 memory.stat	2016-03-17 15:09:34 -07:00
freezer.c	…
futex.c	futex: Replace barrier() in unqueue_me() with READ_ONCE()	2016-03-08 17:04:02 +01:00
futex_compat.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-01-20 17:09:18 -08:00
groups.c	…
hung_task.c	…
irq_work.c	…
jump_label.c	…
kallsyms.c	kallsyms: add support for relative offsets in kallsyms address table	2016-03-15 16:55:16 -07:00
kcmp.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-01-20 17:09:18 -08:00
kexec.c	kexec: set KEXEC_TYPE_CRASH before sanity_check_segment_list()	2016-01-20 17:09:18 -08:00
kexec_core.c	kexec: Set IORESOURCE_SYSTEM_RAM for System RAM	2016-01-30 09:49:57 +01:00
kexec_file.c	x86, kexec, nvdimm: Use walk_iomem_res_desc() for iomem search	2016-01-30 09:49:59 +01:00
kexec_internal.h	kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE	2016-01-20 17:09:18 -08:00
kmod.c	…
kprobes.c	…
ksysfs.c	…
kthread.c	…
latencytop.c	sched/debug: Make schedstats a runtime tunable that is disabled by default	2016-02-09 11:54:23 +01:00
membarrier.c	…
memremap.c	mm: fix two typos in comments for to_vmem_altmap()	2016-03-15 16:55:16 -07:00
module-internal.h	…
module.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching	2016-02-18 16:34:15 -08:00
module_signing.c	…
notifier.c	…
nsproxy.c	…
padata.c	…
panic.c	printk: do cond_resched() between lines while outputting to consoles	2016-01-16 11:17:25 -08:00
params.c	…
pid.c	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-01-31 15:44:04 -08:00
pid_namespace.c	…
profile.c	sched/debug: Make schedstats a runtime tunable that is disabled by default	2016-02-09 11:54:23 +01:00
ptrace.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-01-20 17:09:18 -08:00
range.c	…
reboot.c	…
relay.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
resource.c	resource: Export insert_resource and remove_resource	2016-03-09 11:07:20 -08:00
seccomp.c	seccomp: always propagate NO_NEW_PRIVS on tsync	2016-01-27 07:38:25 -08:00
signal.c	signals: avoid random wakeups in sigsuspend()	2016-02-05 18:10:40 -08:00
smp.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-15 13:50:29 -07:00
smpboot.c	cpu/hotplug: Unpark smpboot threads from the state machine	2016-03-01 20:36:56 +01:00
smpboot.h	cpu/hotplug: Create hotplug threads	2016-03-01 20:36:56 +01:00
softirq.c	sched/debug: Fix preempt_disable_ip recording for preempt_disable()	2016-02-29 09:53:10 +01:00
stacktrace.c	…
stop_machine.c	kernel/stop_machine.c: remove CONFIG_SMP dependencies	2016-01-16 11:17:24 -08:00
sys.c	timer: convert timer_slack_ns from unsigned long to u64	2016-03-17 15:09:34 -07:00
sys_ni.c	…
sysctl.c	mm: scale kswapd watermarks in proportion to memory	2016-03-17 15:09:34 -07:00
sysctl_binary.c	…
task_work.c	…
taskstats.c	…
test_kprobes.c	…
torture.c	…
tracepoint.c	…
tsacct.c	time, acct: Drop irq save & restore from __acct_update_integrals()	2016-02-29 09:53:09 +01:00
uid16.c	…
up.c	…
user-return-notifier.c	…
user.c	…
user_namespace.c	…
utsname.c	…
utsname_sysctl.c	…
watchdog.c	watchdog: don't run proc_watchdog_update if new value is same as old	2016-03-17 15:09:34 -07:00
workqueue.c	tags: Fix DEFINE_PER_CPU expansions	2016-03-15 16:55:16 -07:00
workqueue_internal.h	…