Paul E. McKenney 632ee20013 rcu: Introduce lockdep-based checking to RCU read-side primitives ... Inspection is proving insufficient to catch all RCU misuses, which is understandable given that rcu_dereference() might be protected by any of four different flavors of RCU (RCU, RCU-bh, RCU-sched, and SRCU), and might also/instead be protected by any of a number of locking primitives. It is therefore time to enlist the aid of lockdep. This set of patches is inspired by earlier work by Peter Zijlstra and Thomas Gleixner, and takes the following approach: o Set up separate lockdep classes for RCU, RCU-bh, and RCU-sched. o Set up separate lockdep classes for each instance of SRCU. o Create primitives that check for being in an RCU read-side critical section. These return exact answers if lockdep is fully enabled, but if unsure, report being in an RCU read-side critical section. (We want to avoid false positives!) The primitives are: For RCU: rcu_read_lock_held(void) For RCU-bh: rcu_read_lock_bh_held(void) For RCU-sched: rcu_read_lock_sched_held(void) For SRCU: srcu_read_lock_held(struct srcu_struct *sp) o Add rcu_dereference_check(), which takes a second argument in which one places a boolean expression based on the above primitives and/or lockdep_is_held(). o A new kernel configuration parameter, CONFIG_PROVE_RCU, enables rcu_dereference_check(). This depends on CONFIG_PROVE_LOCKING, and should be quite helpful during the transition period while CONFIG_PROVE_RCU-unaware patches are in flight. The existing rcu_dereference() primitive does no checking, but upcoming patches will change that. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1266887105-1528-1-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2010-02-25 09:40:59 +01:00
..
gcov	microblaze: Enable GCOV_PROFILE_ALL	2009-09-21 14:29:21 +02:00
irq	genirq: Convert irq_desc.lock to raw_spinlock	2009-12-14 23:55:33 +01:00
power	vt: introduce and use vt_kmsg_redirect() function	2009-12-15 08:53:28 -08:00
time	Export the symbol of getboottime and mmonotonic_to_bootbased	2010-02-09 19:20:15 +02:00
trace	tracing/kprobes: Fix probe parsing	2010-02-14 09:43:58 +01:00
.gitignore
acct.c	bsdacct: fix uid/gid misreporting	2009-12-15 08:53:10 -08:00
async.c
audit_tree.c	fix more leaks in audit_tree.c tag_chunk()	2009-12-19 09:27:43 -08:00
audit_watch.c	Audit: reorganize struct audit_watch to save 8 bytes	2009-09-24 03:50:25 -04:00
audit.c	Audit: send signal info if selinux is disabled	2009-09-24 03:50:26 -04:00
audit.h
auditfilter.c
auditsc.c	Sanitize f_flags helpers	2009-12-22 12:27:34 -05:00
backtracetest.c
bounds.c	kbuild: move bounds.h to include/generated	2009-12-12 13:08:14 +01:00
capability.c	remove CONFIG_SECURITY_FILE_CAPABILITIES compile option	2009-11-24 15:06:47 +11:00
cgroup_freezer.c	cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time	2009-09-24 07:20:58 -07:00
cgroup.c	cgroups: fix to return errno in a failure path	2010-02-02 18:11:22 -08:00
compat.c
configs.c
cpu.c	sched: Correct printk whitespace in warning from cpu down task check	2010-01-28 06:59:55 +01:00
cpuset.c	sched: Fix balance vs hotplug race	2009-12-06 21:10:56 +01:00
cred-internals.h
cred.c	kernel/cred.c: use kmem_cache_free	2010-02-03 10:21:57 +11:00
delayacct.c	headers: taskstats_kern.h trim	2009-09-18 09:48:52 -07:00
dma.c
exec_domain.c
exit.c	do_wait() optimization: do not place sub-threads on task_struct->children list	2009-12-17 15:45:31 -08:00
extable.c
fork.c	sched: Fix fork vs hotplug vs cpuset namespaces	2010-01-21 23:25:31 +01:00
freezer.c	sched: fix nr_uninterruptible accounting of frozen tasks really	2009-07-18 14:19:53 +02:00
futex_compat.c	futex: Fix compat_futex to be same as futex for REQUEUE_PI	2009-08-10 15:41:12 +02:00
futex.c	futex: Handle futex value corruption gracefully	2010-02-03 15:13:22 +01:00
groups.c
hrtimer.c	hrtimers: Convert to raw_spinlocks	2009-12-14 23:55:34 +01:00
hung_task.c	softlockup: Fix hung_task_check_count sysctl	2009-11-27 06:21:57 +01:00
hw_breakpoint.c	perf: Make bp_len type to u64 generic across the arch	2010-02-04 01:07:12 +01:00
itimer.c	itimers: Fix racy writes to cpu_itimer fields	2009-11-18 16:32:12 +01:00
kallsyms.c	hw-breakpoints: Fix broken hw-breakpoint sample module	2009-11-10 11:23:29 +01:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	mutex: Better control mutex adaptive spinning config	2009-12-03 11:50:11 +01:00
Kconfig.preempt
kexec.c	Merge git://git.infradead.org/~dwmw2/mtd-2.6.33	2010-01-24 10:31:34 -08:00
kfifo.c	kfifo: Don't use integer as NULL pointer	2010-02-16 15:11:08 -08:00
kgdb.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-02-04 16:07:41 -08:00
kmod.c	kmod: fix resource leak in call_usermodehelper_pipe()	2010-01-11 09:34:04 -08:00
kprobes.c	kprobes: Fix distinct type warning	2009-12-28 10:25:31 +01:00
ksysfs.c	kexec: premit reduction of the reserved memory size	2009-12-16 07:20:13 -08:00
kthread.c	sched: Move kthread_bind() back to kthread.c	2009-12-16 19:01:57 +01:00
latencytop.c
lockdep_internals.h	lockdep: BFS cleanup	2009-07-24 10:53:29 +02:00
lockdep_proc.c	seq_file: constify seq_operations	2009-09-23 07:39:29 -07:00
lockdep_states.h
lockdep.c	lockdep: Fix check_usage_backwards() error message	2010-01-27 08:34:02 +01:00
Makefile	Merge branch 'kvm-updates/2.6.33' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2009-12-08 08:02:38 -08:00
module.c	modules: Skip empty sections when exporting section notes	2010-01-06 01:11:29 -08:00
mutex-debug.c	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
mutex-debug.h	locking: Implement new raw_spinlock	2009-12-14 23:55:32 +01:00
mutex.c	mutex: Better control mutex adaptive spinning config	2009-12-03 11:50:11 +01:00
mutex.h
notifier.c	kprobes: Fix to add __kprobes to notify_die	2009-08-30 03:08:26 +02:00
ns_cgroup.c	cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time	2009-09-24 07:20:58 -07:00
nsproxy.c
panic.c	kmsg_dump: Dump on crash_kexec as well	2009-12-31 19:45:04 +00:00
params.c	tree-wide: convert open calls to remove spaces to skip_spaces() lib function	2009-12-15 08:53:32 -08:00
perf_event.c	perf_events: Fix FORK events	2010-02-14 18:10:39 +01:00
pid_namespace.c	pidns: deny CLONE_PARENT|CLONE_NEWPID combination	2009-09-24 07:21:04 -07:00
pid.c	pid: reduce code size by using a pointer to iterate over array	2009-12-16 07:20:12 -08:00
pm_qos_params.c	pm_qos: clean up racy global "name" variable	2009-10-14 15:31:10 +02:00
posix-cpu-timers.c	posix-cpu-timers: optimize and document timer_create callback	2009-11-18 12:36:05 +01:00
posix-timers.c	time: Introduce CLOCK_REALTIME_COARSE	2009-08-21 21:43:46 +02:00
printk.c	Merge git://git.infradead.org/~dwmw2/mtd-2.6.33	2010-01-24 10:31:34 -08:00
profile.c	kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file	2009-09-20 20:15:40 +02:00
ptrace.c	ptrace: __ptrace_detach: do __wake_up_parent() if we reap the tracee	2009-09-24 07:20:59 -07:00
rcupdate.c	rcu: Introduce lockdep-based checking to RCU read-side primitives	2010-02-25 09:40:59 +01:00
rcutiny.c	rcu: Eliminate unneeded function wrapping	2009-11-22 18:58:16 +01:00
rcutorture.c	rcu: Introduce lockdep-based checking to RCU read-side primitives	2010-02-25 09:40:59 +01:00
rcutree_plugin.h	rcu: Add debug check for too many rcu_read_unlock()	2010-01-13 09:06:06 +01:00
rcutree_trace.c	rcu: Add expedited grace-period support for preemptible RCU	2009-12-03 11:35:25 +01:00
rcutree.c	rcu: Fix sparse warnings	2010-01-16 10:25:22 +01:00
rcutree.h	rcu: Fix sparse warnings	2010-01-16 10:25:22 +01:00
relay.c	const: constify remaining pipe_buf_operations	2009-12-16 07:20:05 -08:00
res_counter.c	memcg: some modification to softlimit under hierarchical memory reclaim.	2009-10-01 16:11:13 -07:00
resource.c	resources: fix call to alignf() in allocate_resource()	2009-12-21 10:42:29 -08:00
rtmutex_common.h
rtmutex-debug.c	sched: Convert pi_lock to raw_spinlock	2009-12-14 23:55:33 +01:00
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c	rtmutes: Convert rtmutex.lock to raw_spinlock	2009-12-14 23:55:33 +01:00
rtmutex.h
rwsem.c
sched_clock.c	sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK	2009-12-15 09:04:36 +01:00
sched_cpupri.c	sched: Convert cpupri lock to raw_spinlock	2009-12-14 23:55:33 +01:00
sched_cpupri.h	sched: Convert cpupri lock to raw_spinlock	2009-12-14 23:55:33 +01:00
sched_debug.c	sched: Convert rq->lock to raw_spinlock	2009-12-14 23:55:33 +01:00
sched_fair.c	sched: Fix vmark regression on big machines	2010-01-21 13:39:03 +01:00
sched_features.h	sched: Discard some old bits	2009-12-09 10:03:07 +01:00
sched_idletask.c	sched: Restore printk sanity	2009-12-20 19:05:02 +01:00
sched_rt.c	sched: Add pre and post wakeup hooks	2009-12-16 19:01:58 +01:00
sched_stats.h
sched.c	sched: Fix fork vs hotplug vs cpuset namespaces	2010-01-21 23:25:31 +01:00
seccomp.c
semaphore.c
signal.c	kernel/signal.c: fix kernel information leak with print-fatal-signals=1	2010-01-11 09:34:05 -08:00
slow-work-debugfs.c	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
slow-work.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6	2009-12-08 07:38:50 -08:00
slow-work.h	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
smp.c	smp_call_function_any(): pass the node value to cpumask_of_node()	2010-01-16 12:15:39 -08:00
softirq.c	hrtimer, softirq: Fix hrtimer->softirq trampoline	2010-02-03 18:17:40 +01:00
softlockup.c	softlockup: Add sched_clock_tick() to avoid kernel warning on kgdb resume	2010-02-01 08:22:32 +01:00
spinlock.c	locking: Cleanup the name space completely	2009-12-14 23:55:33 +01:00
srcu.c	rcu: Introduce lockdep-based checking to RCU read-side primitives	2010-02-25 09:40:59 +01:00
stacktrace.c
stop_machine.c
sys_ni.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2009-12-08 07:55:01 -08:00
sys.c	kernel/sys.c: fix missing rcu protection for sys_getpriority()	2010-02-22 19:50:34 -08:00
sysctl_binary.c	SYSCTL: Print binary sysctl warnings (nearly) only once	2009-12-23 21:00:20 +01:00
sysctl_check.c	ipv4 05/05: add sysctl to accept packets with local source addresses	2009-12-03 12:14:38 -08:00
sysctl.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6	2009-12-17 16:58:26 -08:00
taskstats.c	genetlink: make netns aware	2009-07-12 14:03:27 -07:00
test_kprobes.c
time.c	Revert "time: Remove xtime_cache"	2009-12-22 14:10:37 -08:00
timeconst.pl
timer.c	perf: Fix perf_event_do_pending() fallback callsite	2010-01-21 13:40:39 +01:00
tracepoint.c	trivial: fix typo "to to" in multiple files	2009-09-21 15:14:55 +02:00
tsacct.c
uid16.c	headers: utsname.h redux	2009-09-23 18:13:10 -07:00
up.c
user_namespace.c
user-return-notifier.c	core: Clean up user return notifers use of per_cpu	2009-12-02 10:22:59 +01:00
user.c	uids: Prevent tear down race	2009-11-02 16:02:39 +01:00
utsname_sysctl.c	sysctl kernel: Remove binary sysctl logic	2009-11-12 02:04:55 -08:00
utsname.c
wait.c	locking, sched: Give waitqueue spinlocks their own lockdep classes	2009-08-10 14:43:09 +02:00
workqueue.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2009-12-10 09:35:44 -08:00