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i2som-imx-linux/kernel
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John Ogness d397820f36 printk: ringbuffer: support dataless records 
With commit 896fbe20b4 ("printk: use the lockless ringbuffer"),
printk() started silently dropping messages without text because such
records are not supported by the new printk ringbuffer.

Add support for such records.

Currently dataless records are denoted by INVALID_LPOS in order
to recognize failed prb_reserve() calls. Change the ringbuffer
to instead use two different identifiers (FAILED_LPOS and
NO_LPOS) to distinguish between failed prb_reserve() records and
successful dataless records, respectively.

Fixes: 896fbe20b4 ("printk: use the lockless ringbuffer")
Fixes: https://lkml.kernel.org/r/20200718121053.GA691245@elver.google.com
Reported-by: Marco Elver <elver@google.com>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200721132528.9661-1-john.ogness@linutronix.de
2020-09-08 09:32:59 +02:00
..
bpf
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-06-13 16:27:13 -07:00
cgroup
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
configs
…
debug
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00
dma
dma-pool: decouple DMA_REMAP from DMA_COHERENT_POOL
2020-06-15 08:35:30 +02:00
events
Merge branch 'akpm' (patches from Andrew)
2020-06-09 09:54:46 -07:00
gcov
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
irq
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
kcsan
kcsan: Support distinguishing volatile accesses
2020-06-11 20:04:01 +02:00
livepatch
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locking
Merge tag 'x86-entry-2020-06-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-06-13 10:05:47 -07:00
power
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
printk
printk: ringbuffer: support dataless records
2020-09-08 09:32:59 +02:00
rcu
…
sched
Rebase locking/kcsan to locking/urgent
2020-06-11 20:02:46 +02:00
time
Merge tag 'x86-entry-2020-06-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-06-13 10:05:47 -07:00
trace
Merge tag 'trace-v5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2020-06-20 13:17:47 -07:00
.gitignore
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acct.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
async.c
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audit_fsnotify.c
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audit_tree.c
…
audit_watch.c
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audit.c
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audit.h
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auditfilter.c
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auditsc.c
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backtracetest.c
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bounds.c
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capability.c
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compat.c
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configs.c
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context_tracking.c
context_tracking: Ensure that the critical path cannot be instrumented
2020-06-11 15:14:36 +02:00
cpu_pm.c
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cpu.c
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crash_core.c
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crash_dump.c
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cred.c
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delayacct.c
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dma.c
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elfcore.c
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exec_domain.c
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exit.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
extable.c
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fail_function.c
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fork.c
mmap locking API: convert nested write lock sites
2020-06-09 09:39:14 -07:00
freezer.c
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futex.c
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
2020-06-09 09:39:14 -07:00
gen_kheaders.sh
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groups.c
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hung_task.c
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iomem.c
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irq_work.c
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jump_label.c
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kallsyms.c
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kcmp.c
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Kconfig.freezer
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Kconfig.hz
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Kconfig.locks
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Kconfig.preempt
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kcov.c
kcov: check kcov_softirq in kcov_remote_stop()
2020-06-10 19:14:17 -07:00
kexec_core.c
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kexec_elf.c
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kexec_file.c
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kexec_internal.h
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kexec.c
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kheaders.c
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kmod.c
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kprobes.c
kretprobe: Prevent triggering kretprobe from within kprobe_flush_task
2020-06-16 21:21:01 -04:00
ksysfs.c
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kthread.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00
latencytop.c
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Makefile
Merge tag 'notifications-20200601' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
2020-06-13 09:56:21 -07:00
module_signature.c
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module_signing.c
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module-internal.h
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module.c
module: move the set_fs hack for flush_icache_range to m68k
2020-06-08 11:05:58 -07:00
notifier.c
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nsproxy.c
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padata.c
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panic.c
bug: Annotate WARN/BUG/stackfail as noinstr safe
2020-06-11 15:14:36 +02:00
params.c
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pid_namespace.c
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pid.c
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profile.c
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ptrace.c
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range.c
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reboot.c
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relay.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
resource.c
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rseq.c
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scs.c
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seccomp.c
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signal.c
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smp.c
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smpboot.c
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smpboot.h
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softirq.c
x86/entry: Clarify irq_{enter,exit}_rcu()
2020-06-11 15:15:24 +02:00
stackleak.c
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stacktrace.c
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stop_machine.c
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sys_ni.c
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sys.c
Merge tag 'LSM-add-setgid-hook-5.8-author-fix' of git://github.com/micah-morton/linux
2020-06-14 11:39:31 -07:00
sysctl_binary.c
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sysctl-test.c
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sysctl.c
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task_work.c
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taskstats.c
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test_kprobes.c
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torture.c
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tracepoint.c
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tsacct.c
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ucount.c
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uid16.c
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uid16.h
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umh.c
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up.c
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user_namespace.c
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user-return-notifier.c
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user.c
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utsname_sysctl.c
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utsname.c
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watch_queue.c
Merge tag 'notifications-20200601' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
2020-06-13 09:56:21 -07:00
watchdog_hld.c
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watchdog.c
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workqueue_internal.h
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workqueue.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00