Petr Mladek
22c2c7b2ef
printk/NMI: handle continuous lines and missing newline
...
Commit 4bcc595ccd ("printk: reinstate KERN_CONT for printing
continuation lines") added back KERN_CONT message header. As a result
it might appear in the middle of the line when the parts are squashed
via the temporary NMI buffer.
A reasonable solution seems to be to split the text in the NNI temporary
not only by newlines but also by the message headers.
Another solution would be to filter out KERN_CONT when writing to the
temporary buffer. But this would complicate the lockless handling.
Also it would not solve problems with a missing newline that was there
even before the KERN_CONT stuff.
This patch moves the temporary buffer handling into separate function.
I played with it and it seems that using the char pointers make the code
easier to read.
Also it prints the final newline as a continuous line.
Finally, it moves handling of the s->len overflow into the paranoid
check. And allows to recover from the disaster.
Link: http://lkml.kernel.org/r/1478695291-12169-2-git-send-email-pmladek@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Joe Perches <joe@perches.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: David Sterba <dsterba@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-12 18:55:09 -08:00
..
bpf
bpf: xdp: Allow head adjustment in XDP prog
2016-12-08 14:25:13 -05:00
configs
config: android: enable CONFIG_SECCOMP
2016-10-11 15:06:32 -07:00
debug
events
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-12-10 16:21:55 -05:00
gcov
gcov: add support for gcc version >= 6
2016-07-15 14:54:27 +09:00
irq
genirq: Use irq type from irqdata instead of irqdesc
2016-11-08 15:15:19 +01:00
livepatch
livepatch/module: make TAINT_LIVEPATCH module-specific
2016-08-26 14:42:08 +02:00
locking
Merge branch 'linus' into locking/core, to pick up fixes
2016-12-11 13:07:13 +01:00
power
PM / sleep: fix device reference leak in test_suspend
2016-11-02 05:10:04 +01:00
printk
printk/NMI: handle continuous lines and missing newline
2016-12-12 18:55:09 -08:00
rcu
rcu: Don't kick unless grace period or request
2016-11-14 10:46:31 -08:00
sched
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-12-12 12:15:10 -08:00
time
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-12-12 12:15:10 -08:00
trace
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-11-22 13:27:16 -05:00
.gitignore
acct.c
async.c
audit.c
audit: remove useless synchronize_net()
2016-12-01 11:29:02 -05:00
audit.h
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-07-29 17:54:17 -07:00
audit_fsnotify.c
audit_tree.c
audit: cleanup prune_tree_thread
2016-04-04 09:46:47 -04:00
audit_watch.c
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-09-01 15:55:56 -07:00
auditfilter.c
audit: add fields to exclude filter by reusing user filter
2016-06-27 11:01:00 -04:00
auditsc.c
Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit
2016-10-04 14:21:41 -07:00
backtracetest.c
bounds.c
capability.c
kernel: Add noaudit variant of ns_capable()
2016-06-06 20:16:18 +10:00
cgroup.c
cgroup: add support for eBPF programs
2016-11-25 16:25:52 -05:00
cgroup_freezer.c
cgroup_pids.c
cgroup: Use lld instead of ld when printing pids controller events_limit
2016-06-21 15:03:36 -04:00
compat.c
configs.c
context_tracking.c
cpu.c
hotplug: Make register and unregister notifier API symmetric
2016-12-08 10:08:41 +01:00
cpu_pm.c
cpuset.c
Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2016-10-14 12:18:50 -07:00
crash_dump.c
cred.c
cred: Reject inodes with invalid ids in set_create_file_as()
2016-06-30 18:05:09 -05:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c
sched/autogroup: Do not use autogroup->tg in zombie threads
2016-11-22 12:33:43 +01:00
extable.c
fork.c
kernel/fork: use vfree_atomic() to free thread stack
2016-12-12 18:55:08 -08:00
freezer.c
freezer, oom: check TIF_MEMDIE on the correct task
2016-07-28 16:07:41 -07:00
futex.c
sched/wake_q: Rename WAKE_Q to DEFINE_WAKE_Q
2016-11-21 10:29:01 +01:00
futex_compat.c
groups.c
cred: simpler, 1D supplementary groups
2016-10-07 18:46:30 -07:00
hung_task.c
hung_task: decrement sysctl_hung_task_warnings only if it is positive
2016-12-12 18:55:09 -08:00
irq_work.c
jump_label.c
powerpc updates for 4.8 #2
2016-08-05 09:00:54 -04:00
kallsyms.c
kallsyms: add support for relative offsets in kallsyms address table
2016-03-15 16:55:16 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES
2016-10-25 11:31:51 +02:00
Kconfig.preempt
kcov.c
kcov: add missing #include <linux/sched.h>
2016-12-07 17:10:00 -08:00
kexec.c
kexec: allow architectures to override boot mapping
2016-08-02 19:35:27 -04:00
kexec_core.c
kexec: add restriction on kexec_load() segment sizes
2016-08-02 19:35:31 -04:00
kexec_file.c
kexec: fix double-free when failing to relocate the purgatory
2016-09-01 17:52:01 -07:00
kexec_internal.h
kmod.c
kprobes.c
kprobes: include <asm/sections.h> instead of <asm-generic/sections.h>
2016-10-11 15:06:31 -07:00
ksysfs.c
kexec: add a kexec_crash_loaded() function
2016-08-02 19:35:30 -04:00
kthread.c
kthread: add __printf attributes
2016-12-12 18:55:06 -08:00
latencytop.c
Makefile
userns: Add per user namespace sysctls.
2016-08-08 13:18:58 -05:00
membarrier.c
memremap.c
mm: fix cache mode of dax pmd mappings
2016-09-09 17:34:46 -07:00
module-internal.h
module.c
Re-enable CONFIG_MODVERSIONS in a slightly weaker form
2016-11-29 16:01:30 -08:00
module_signing.c
KEYS: Move the point of trust determination to __key_link()
2016-04-11 22:43:43 +01:00
notifier.c
nsproxy.c
padata.c
padata: Convert to hotplug state machine
2016-09-19 21:44:30 +02:00
panic.c
x86/panic: replace smp_send_stop() with kdump friendly version in panic path
2016-10-11 15:06:32 -07:00
params.c
pid.c
remove lots of IS_ERR_VALUE abuses
2016-05-27 15:26:11 -07:00
pid_namespace.c
Merge branch 'nsfs-ioctls' into HEAD
2016-09-22 20:00:36 -05:00
profile.c
profile: Convert to hotplug state machine
2016-07-15 10:41:42 +02:00
ptrace.c
mm: replace access_process_vm() write parameter with gup_flags
2016-10-19 08:31:25 -07:00
range.c
reboot.c
relay.c
relay: Use irq_work instead of plain timer for deferred wakeup
2016-10-11 15:06:32 -07:00
resource.c
/proc/iomem: only expose physical resource addresses to privileged users
2016-04-14 12:56:09 -07:00
seccomp.c
bpf: drop unnecessary context cast from BPF_PROG_RUN
2016-11-27 20:38:47 -05:00
signal.c
x86/signal: Add SA_{X32,IA32}_ABI sa_flags
2016-09-14 21:28:11 +02:00
smp.c
kernel/smp: Tell the user we're bringing up secondary CPUs
2016-10-26 12:02:35 +02:00
smpboot.c
kthread/smpboot: do not park in kthread_create_on_cpu()
2016-10-11 15:06:33 -07:00
smpboot.h
softirq.c
softirq: Display IRQ_POLL for irq-poll statistics
2016-10-21 15:45:47 -06:00
stacktrace.c
stop_machine.c
locking/core, stop_machine: Yield the CPU during stop machine()
2016-11-16 10:15:09 +01:00
sys.c
prctl: remove one-shot limitation for changing exe link
2016-12-12 18:55:06 -08:00
sys_ni.c
x86/pkeys: Fix pkeys build breakage for some non-x86 arches
2016-09-13 14:41:36 +02:00
sysctl.c
sched/fair: Kill the unused 'sched_shares_window_ns' tunable
2016-10-20 08:44:57 +02:00
sysctl_binary.c
kernel/sysctl_binary.c: use generic UUID library
2016-05-20 17:58:30 -07:00
task_work.c
task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works
2016-08-02 19:35:02 -04:00
taskstats.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-11-15 10:54:36 -05:00
test_kprobes.c
torture.c
torture: Convert torture_shutdown() to hrtimer
2016-08-22 10:01:49 -07:00
tracepoint.c
kernel/...: convert pr_warning to pr_warn
2016-03-22 15:36:02 -07:00
tsacct.c
ucount.c
mntns: Add a limit on the number of mount namespaces.
2016-08-31 07:28:35 -05:00
uid16.c
cred: simpler, 1D supplementary groups
2016-10-07 18:46:30 -07:00
up.c
smp: Add function to execute a function synchronously on a CPU
2016-09-05 13:52:39 +02:00
user-return-notifier.c
user.c
user_namespace.c
Merge branch 'nsfs-ioctls' into HEAD
2016-09-22 20:00:36 -05:00
utsname.c
Merge branch 'nsfs-ioctls' into HEAD
2016-09-22 20:00:36 -05:00
utsname_sysctl.c
watchdog.c
Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86"
2016-07-10 20:58:36 +02:00
workqueue.c
kthread: rename probe_kthread_data() to kthread_probe_data()
2016-10-11 15:06:33 -07:00
workqueue_internal.h