android_kernel_samsung_univ.../kernel
Jan Beulich 116e90b23f syslog: fill buffer with more than a single message for SYSLOG_ACTION_READ
The recent changes to the printk buffer management resulted in
SYSLOG_ACTION_READ to only return a single message, whereas previously
the buffer would get filled as much as possible. As, when too small to
fit everything, filling it to the last byte would be pretty ugly with
the new code, the patch arranges for as many messages as possible to
get returned in a single invocation. User space tools in at least all
SLES versions depend on the old behavior.

This at once addresses the issue attempted to get fixed with commit
b56a39ac26 ("printk: return -EINVAL if
the message len is bigger than the buf size"), and since that commit
widened the possibility for losing a message altogether, the patch
here assumes that this other commit would get reverted first
(otherwise the patch here won't apply).

Furthermore, this patch also addresses the problem dealt with in
commit 4a77a5a06e ("printk: use mutex
lock to stop syslog_seq from going wild"), so I'd recommend reverting
that one too (albeit there's no direct collision between the two).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Kay Sievers <kay@vrfy.org>
Cc: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-26 12:37:36 -07:00
..
debug
events perf: Use css_tryget() to avoid propping up css refcount 2012-06-18 11:45:57 +02:00
gcov
irq Merge branches 'irq-urgent-for-linus' and 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-04 11:36:51 -07:00
power
sched Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-08 14:59:29 -07:00
time Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-15 16:52:35 -07:00
trace tracing: Have tracing_off() actually turn tracing off 2012-06-06 22:15:14 -04:00
.gitignore
acct.c
async.c
audit_tree.c
audit_watch.c
audit.c
audit.h
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cgroup_freezer.c
cgroup.c cgroups: Account for CSS_DEACT_BIAS in __css_put 2012-06-18 15:38:02 -07:00
compat.c
configs.c
cpu_pm.c kernel/cpu_pm.c: fix various typos 2012-05-31 17:49:27 -07:00
cpu.c kernel/cpu.c: document clear_tasks_mm_cpumask() 2012-05-31 17:49:30 -07:00
cpuset.c
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c pidns: find_new_reaper() can no longer switch to init_pid_ns.child_reaper 2012-06-20 14:39:36 -07:00
extable.c
fork.c Revert "mm: correctly synchronize rss-counters at exit/exec" 2012-06-07 17:54:07 -07:00
freezer.c
futex_compat.c
futex.c
groups.c
hrtimer.c
hung_task.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c
kcmp.c syscalls, x86: add __NR_kcmp syscall 2012-05-31 17:49:32 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c
kfifo.c
kmod.c kmod.c: fix kernel-doc warning 2012-05-31 17:49:28 -07:00
kprobes.c
ksysfs.c
kthread.c
latencytop.c
lglock.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
lockdep.c
Makefile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-06-01 10:34:35 -07:00
module.c
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid_namespace.c pidns: guarantee that the pidns init will be the last pidns process reaped 2012-06-20 14:39:36 -07:00
pid.c
posix-cpu-timers.c
posix-timers.c
printk.c syslog: fill buffer with more than a single message for SYSLOG_ACTION_READ 2012-06-26 12:37:36 -07:00
profile.c
ptrace.c
range.c
rcu.h
rcupdate.c
rcutiny_plugin.h
rcutiny.c
rcutorture.c
rcutree_plugin.h rcu: Precompute RCU_FAST_NO_HZ timer offsets 2012-06-06 20:43:28 -07:00
rcutree_trace.c
rcutree.c rcu: RCU_FAST_NO_HZ detection of callback adoption 2012-06-06 20:43:27 -07:00
rcutree.h rcu: Move RCU_FAST_NO_HZ per-CPU variables to rcu_dynticks structure 2012-06-06 20:43:28 -07:00
relay.c
res_counter.c
resource.c kernel/resource.c: correct the comment of allocate_resource() 2012-05-31 17:49:26 -07:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c
seccomp.c
semaphore.c
signal.c new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
smp.c
smpboot.c
smpboot.h
softirq.c
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys_ni.c syscalls, x86: add __NR_kcmp syscall 2012-05-31 17:49:32 -07:00
sys.c c/r: prctl: Move PR_GET_TID_ADDRESS to a proper place 2012-06-20 14:39:36 -07:00
sysctl_binary.c
sysctl.c
task_work.c
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c
tracepoint.c
tsacct.c
uid16.c
up.c
user_namespace.c
user-return-notifier.c
user.c
utsname_sysctl.c
utsname.c
wait.c
watchdog.c watchdog: Quiet down the boot messages 2012-06-14 12:20:50 +02:00
workqueue_sched.h
workqueue.c