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linux/kernel
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Paul E. McKenney c17ac85504 Make rcutorture RNG use temporal entropy 
Repost of http://lkml.org/lkml/2007/8/10/472 made available by request.

The locking used by get_random_bytes() can conflict with the
preempt_disable() and synchronize_sched() form of RCU.  This patch changes
rcutorture's RNG to gather entropy from the new cpu_clock() interface
(relying on interrupts, preemption, daemons, and rcutorture's reader
thread's rock-bottom scheduling priority to provide useful entropy), and
also adds and EXPORT_SYMBOL_GPL() to make that interface available to GPLed
kernel modules such as rcutorture.

Passes several hours of rcutorture.

[ego@in.ibm.com: Use raw_smp_processor_id() in rcu_random()]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17 08:42:53 -07:00
..
irq
Fix CONFIG_DEBUG_SHIRQ trigger on free_irq()
2007-10-17 08:42:49 -07:00
power
hibernation doesn't even build on frv - tons of helpers are missing
2007-09-26 09:22:04 -07:00
time
Use num_possible_cpus() instead of NR_CPUS for timer distribution
2007-10-17 08:42:53 -07:00
.gitignore
…
acct.c
Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().
2007-07-25 10:09:20 -07:00
audit.c
[NET]: make netlink user -> kernel interface synchronious
2007-10-10 21:15:29 -07:00
audit.h
Audit: add TTY input auditing
2007-07-16 09:05:47 -07:00
auditfilter.c
[PATCH] allow audit filtering on bit & operations
2007-07-22 09:57:02 -04:00
auditsc.c
Clean up duplicate includes in kernel/
2007-10-17 08:42:48 -07:00
capability.c
[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task
2007-02-12 09:48:32 -08:00
compat.c
signal/timer/event: timerfd compat code
2007-05-11 08:29:36 -07:00
configs.c
use simple_read_from_buffer in kernel/
2007-05-09 12:30:49 -07:00
cpu.c
PM: Fix dependencies of CONFIG_SUSPEND and CONFIG_HIBERNATION
2007-08-31 01:42:22 -07:00
cpuset.c
oom: compare cpuset mems_allowed instead of exclusive ancestors
2007-10-17 08:42:46 -07:00
delayacct.c
sched: clean up schedstats, cnt -> count
2007-10-15 17:00:12 +02:00
die_notifier.c
move die notifier handling to common code
2007-05-08 11:15:04 -07:00
dma.c
[PATCH] struct seq_operations and struct file_operations constification
2006-12-07 08:39:46 -08:00
exec_domain.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
exit.c
wait_task_stopped/continued: remove unneeded p->signal != NULL check
2007-10-17 08:42:52 -07:00
extable.c
…
fork.c
Slab API: remove useless ctor parameter and reorder parameters
2007-10-17 08:42:45 -07:00
futex_compat.c
robust futex thread exit race
2007-10-01 07:52:23 -07:00
futex.c
robust futex thread exit race
2007-10-01 07:52:23 -07:00
hrtimer.c
[KTIME]: Introduce ktime_sub_ns and ktime_sub_us
2007-10-10 16:48:12 -07:00
itimer.c
The scheduled -EINVAL for invalid timevals in setitimer
2007-05-08 11:15:13 -07:00
kallsyms.c
kallsyms: make KSYM_NAME_LEN include space for trailing '\0'
2007-07-17 10:23:03 -07:00
Kconfig.hz
[PATCH] HZ: 300Hz support
2006-12-07 08:39:36 -08:00
Kconfig.preempt
[PATCH] sched: arch preempt notifier mechanism
2007-07-26 13:40:43 +02:00
kexec.c
Clean up duplicate includes in kernel/
2007-10-17 08:42:48 -07:00
kfifo.c
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
kmod.c
Restore call_usermodehelper_pipe() behaviour
2007-09-11 17:21:20 -07:00
kprobes.c
kprobes: support kretprobe blacklist
2007-10-16 09:43:10 -07:00
ksysfs.c
sched: group scheduling, sysfs tunables
2007-10-15 17:00:14 +02:00
kthread.c
kthread: silence bogus section mismatch warning
2007-07-31 15:39:42 -07:00
latency.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
lockdep_internals.h
[PATCH] lockdep: more chains
2006-12-07 08:39:43 -08:00
lockdep_proc.c
lockdep: Avoid /proc/lockdep & lock_stat infinite output
2007-10-11 22:11:11 +02:00
lockdep.c
lockdep: syscall exit check
2007-10-11 22:11:12 +02:00
Makefile
user namespace: add the framework
2007-07-16 09:05:47 -07:00
module.c
Add /sys/module/name/notes
2007-10-17 08:42:50 -07:00
mutex-debug.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
mutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
mutex.c
lockdep: fixup mutex annotations
2007-10-11 22:11:12 +02:00
mutex.h
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
nsproxy.c
[NET]: Add network namespace clone & unshare support.
2007-10-10 16:52:46 -07:00
panic.c
Report that kernel is tainted if there was an OOPS
2007-07-17 10:23:02 -07:00
params.c
modules: better error messages when modules fail to load due to a sysfs problem.
2007-07-30 14:25:23 -07:00
pid.c
namespace: ensure clone_flags are always stored in an unsigned long
2007-07-16 09:05:48 -07:00
posix-cpu-timers.c
sched: make posix-cpu-timers use CFS's accounting information
2007-07-09 18:51:58 +02:00
posix-timers.c
SLAB_PANIC more (proc, posix-timers, shmem)
2007-10-17 08:42:47 -07:00
printk.c
printk: add interfaces for external access to the log buffer
2007-10-17 08:42:50 -07:00
profile.c
Memoryless nodes: Allow profiling data to fall back to other nodes
2007-10-16 09:42:58 -07:00
ptrace.c
m32r: convert to generic sys_ptrace
2007-10-16 09:43:04 -07:00
rcupdate.c
Clean up duplicate includes in kernel/
2007-10-17 08:42:48 -07:00
rcutorture.c
Make rcutorture RNG use temporal entropy
2007-10-17 08:42:53 -07:00
relay.c
Fix a use after free bug in kernel->userspace relay file support
2007-07-31 15:39:42 -07:00
resource.c
memory unplug: memory hotplug cleanup
2007-10-16 09:43:01 -07:00
rtmutex_common.h
FUTEX: Tidy up the code
2007-07-16 09:05:49 -07:00
rtmutex-debug.c
kernel/rtmutex-debug.c: cleanups
2007-10-17 08:42:50 -07:00
rtmutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rtmutex-tester.c
Freezer: make kernel threads nonfreezable by default
2007-07-17 10:23:02 -07:00
rtmutex.c
FUTEX: Tidy up the code
2007-07-16 09:05:49 -07:00
rtmutex.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rwsem.c
lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex
2007-07-19 10:04:49 -07:00
sched_debug.c
Make scheduler debug file operations const
2007-10-15 17:00:19 +02:00
sched_fair.c
sched: reintroduce cache-hot affinity
2007-10-15 17:00:18 +02:00
sched_idletask.c
sched: mark scheduling classes as const
2007-10-15 17:00:12 +02:00
sched_rt.c
sched: tidy up SCHED_RR
2007-10-15 17:00:13 +02:00
sched_stats.h
sched: clean up schedstats, cnt -> count
2007-10-15 17:00:12 +02:00
sched.c
cpuset: remove sched domain hooks from cpusets
2007-10-16 09:43:09 -07:00
seccomp.c
make seccomp zerocost in schedule
2007-07-16 09:05:50 -07:00
signal.c
__group_complete_signal: eliminate unneeded wakeup of ->group_exit_task
2007-10-17 08:42:51 -07:00
softirq.c
[KERNEL]: Unexport raise_softirq_irqoff
2007-10-10 16:49:18 -07:00
softlockup.c
softlockup: add a /proc tuning parameter
2007-10-17 08:42:47 -07:00
spinlock.c
lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex
2007-07-19 10:04:49 -07:00
srcu.c
[PATCH] SRCU: report out-of-memory errors
2006-10-04 07:55:30 -07:00
stacktrace.c
[PATCH] lockdep: stacktrace subsystem, core
2006-07-03 15:27:02 -07:00
stop_machine.c
Fix stop_machine_run problem with naughty real time process
2007-07-16 09:05:41 -07:00
sys_ni.c
diskquota: 32bit quota tools on 64bit architectures
2007-07-16 09:05:48 -07:00
sys.c
Fix SMP poweroff hangs
2007-10-01 07:52:23 -07:00
sysctl.c
softlockup: add a /proc tuning parameter
2007-10-17 08:42:47 -07:00
taskstats.c
Clean up duplicate includes in kernel/
2007-10-17 08:42:48 -07:00
time.c
Clean up duplicate includes in kernel/
2007-10-17 08:42:48 -07:00
timer.c
Pull ia64-clocksource into release branch
2007-07-20 11:26:47 -07:00
tsacct.c
Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().
2007-07-25 10:09:20 -07:00
uid16.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
user_namespace.c
Fix user namespace exiting OOPs
2007-09-19 11:24:18 -07:00
user.c
sched: generate uevents for user creation/destruction
2007-10-15 17:00:18 +02:00
utsname_sysctl.c
remove CONFIG_UTS_NS and CONFIG_IPC_NS
2007-07-16 09:05:47 -07:00
utsname.c
Fix UTS corruption during clone(CLONE_NEWUTS)
2007-09-19 11:24:17 -07:00
wait.c
Fix occurrences of "the the "
2007-05-09 08:57:56 +02:00
workqueue.c
fix bogus hotplug cpu warning
2007-08-27 10:27:48 -07:00