Petr Mladek 39b25109b4 printk: use also the last bytes in the ring buffer ... It seems that we have newer used the last byte in the ring buffer. In fact, we have newer used the last 4 bytes because of padding. First problem is in the check for free space. The exact number of free bytes is enough to store the length of data. Second problem is in the check where the ring buffer is rotated. The left side counts the first unused index. It is unused, so it might be the same as the size of the buffer. Note that the first problem has to be fixed together with the second one. Otherwise, the buffer is rotated even when there is enough space on the end of the buffer. Then the beginning of the buffer is rewritten and valid entries get corrupted. Signed-off-by: Petr Mladek <pmladek@suse.cz> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jan Kara <jack@suse.cz> Cc: Michal Hocko <mhocko@suse.cz> Cc: Kay Sievers <kay@vrfy.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-04-03 16:21:07 -07:00
..
debug	KGDB: make kgdb_breakpoint() as noinline	2014-02-26 11:16:25 +00:00
events	perf: Optimize group_sched_in()	2014-02-27 12:43:26 +01:00
gcov
irq	genirq: Export symbol no_action()	2014-03-22 11:33:09 +01:00
locking	Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 14:13:25 -07:00
power	Merge branches 'pm-runtime' and 'pm-sleep'	2014-03-20 13:25:54 +01:00
printk	printk: use also the last bytes in the ring buffer	2014-04-03 16:21:07 -07:00
rcu	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 11:21:19 -07:00
sched	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-01 11:00:07 -07:00
trace	Merge branch 'for-3.15/core' of git://git.kernel.dk/linux-block	2014-04-01 19:19:15 -07:00
.gitignore
acct.c
async.c
audit_tree.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
audit_watch.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
audit.c	AUDIT: Allow login in non-init namespaces	2014-03-30 17:02:53 -07:00
audit.h	audit: Use struct net not pid_t to remember the network namespce to reply in	2014-02-28 04:04:33 -08:00
auditfilter.c	audit: Update kdoc for audit_send_reply and audit_list_rules_send	2014-03-08 15:31:54 -08:00
auditsc.c	execve: use 'struct filename *' for executable name passing	2014-02-05 12:54:53 -08:00
backtracetest.c
bounds.c	mm: do not allocate page->ptl dynamically, if spinlock_t fits to long	2013-12-20 12:25:45 -08:00
capability.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2014-04-03 09:26:18 -07:00
cgroup_freezer.c
cgroup.c	cgroup: fix a failure path in create_css()	2014-03-18 17:15:36 -04:00
compat.c	Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-02 12:51:41 -07:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c
cpuset.c	mm: optimize put_mems_allowed() usage	2014-04-03 16:20:58 -07:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	introduce for_each_thread() to replace the buggy while_each_thread()	2014-01-21 16:19:46 -08:00
extable.c	asmlinkage: Make main_extable_sort_needed visible	2014-02-13 18:13:22 -08:00
fork.c	sched/numa: Move task_numa_free() to __put_task_struct()	2014-03-11 12:05:43 +01:00
freezer.c	libata, freezer: avoid block device removal while system is frozen	2013-12-19 13:50:32 -05:00
futex_compat.c	compat: Get rid of (get|put)_compat_time(val|spec)	2014-02-02 14:09:12 -08:00
futex.c	Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 10:59:39 -07:00
groups.c	kernel/groups.c: remove return value of set_groups	2014-04-03 16:21:05 -07:00
hrtimer.c	timer: Remove code redundancy while calling get_nohz_timer_target()	2014-03-20 12:35:46 +01:00
hung_task.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
irq_work.c	perf/x86: Warn to early_printk() in case irq_work is too slow	2014-02-21 21:49:07 +01:00
itimer.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
kmod.c	execve: use 'struct filename *' for executable name passing	2014-02-05 12:54:53 -08:00
kprobes.c
ksysfs.c	rcu: Fix sparse warning for rcu_expedited from kernel/ksysfs.c	2014-02-26 06:35:16 -08:00
kthread.c	kthread: ensure locality of task_struct allocations	2014-04-03 16:20:49 -07:00
latencytop.c
Makefile	Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 14:13:25 -07:00
module_signing.c
module-internal.h
module.c	Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 14:13:25 -07:00
notifier.c	notifier: Substitute rcu_access_pointer() for rcu_dereference_raw()	2014-02-26 06:35:13 -08:00
nsproxy.c
padata.c
panic.c	Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 14:13:25 -07:00
params.c
pid_namespace.c	pid_namespace: pidns_get() should check task_active_pid_ns() != NULL	2014-04-02 16:20:21 -07:00
pid.c
posix-cpu-timers.c
posix-timers.c
profile.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
ptrace.c	kernel/compat: convert to COMPAT_SYSCALL_DEFINE	2014-03-06 15:35:10 +01:00
range.c
reboot.c	kexec: migrate to reboot cpu	2013-12-18 19:04:50 -08:00
relay.c	treewide: Fix typo in Documentation/DocBook	2014-02-19 14:58:17 +01:00
res_counter.c
resource.c	kernel/resource.c: make reallocate_resource() static	2014-04-03 16:21:07 -07:00
seccomp.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2014-04-03 09:26:18 -07:00
signal.c	Merge branch 'master' into for-next	2014-02-20 14:54:28 +01:00
smp.c	smp: Rename __smp_call_function_single() to smp_call_function_single_async()	2014-02-24 14:47:15 -08:00
smpboot.c
smpboot.h
softirq.c	softirq: Add linux/irq.h to make it compile again	2014-03-19 11:28:14 +01:00
stacktrace.c
stop_machine.c	stop_machine: Fix^2 race between stop_two_cpus() and stop_cpus()	2014-03-11 11:33:47 +01:00
sys_ni.c	fs, kernel: permit disabling the uselib syscall	2014-04-03 16:21:05 -07:00
sys.c	sys: Replace hardcoding of -20 and 19 with MIN_NICE and MAX_NICE	2014-02-22 18:16:19 +01:00
sysctl_binary.c
sysctl.c	drop_caches: add some documentation and info message	2014-04-03 16:21:04 -07:00
system_certificates.S
system_keyring.c
task_work.c
taskstats.c
test_kprobes.c
time.c
timeconst.bc
timer.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-01 11:00:07 -07:00
torture.c	rcutorture: Gracefully handle NULL cleanup hooks	2014-02-23 09:04:39 -08:00
tracepoint.c	tracing: Do not add event files for modules that fail tracepoints	2014-03-03 21:11:05 -05:00
tsacct.c
uid16.c
up.c	smp: Rename __smp_call_function_single() to smp_call_function_single_async()	2014-02-24 14:47:15 -08:00
user_namespace.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
user-return-notifier.c
user.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
utsname_sysctl.c
utsname.c
watchdog.c	kernel/watchdog.c: touch_nmi_watchdog should only touch local cpu not every one	2014-04-03 16:20:58 -07:00
workqueue_internal.h
workqueue.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-01 11:00:07 -07:00