Peter Zijlstra 1b12bbc747 lockdep: re-annotate scheduler runqueues ...

Instead of using a per-rq lock class, use the regular nesting operations.

However, take extra care with double_lock_balance() as it can release the
already held rq->lock (and therefore change its nesting class).

So what can happen is:

 spin_lock(rq->lock);	// this rq subclass 0

 double_lock_balance(rq, other_rq);
   // release rq
   // acquire other_rq->lock subclass 0
   // acquire rq->lock subclass 1

 spin_unlock(other_rq->lock);

leaving you with rq->lock in subclass 1

So a subsequent double_lock_balance() call can try to nest a subclass 1
lock while already holding a subclass 1 lock.

Fix this by introducing double_unlock_balance() which releases the other
rq's lock, but also re-sets the subclass for this rq's lock to 0.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2008-08-11 09:30:22 +02:00

..

irq

use WARN() in kernel/irq/chip.c

2008-07-26 12:00:07 -07:00

power

kexec jump: save/restore device state

2008-07-26 12:00:04 -07:00

time

cpumask: change cpumask_of_cpu_ptr to use new cpumask_of_cpu

2008-07-26 16:40:33 +02:00

trace

Merge branch 'linus' into cpus4096

2008-07-28 23:32:00 +02:00

.gitignore

…

acct.c

bsdacct: fix and add comments around acct_process()

2008-07-25 10:53:47 -07:00

audit_tree.c

[PATCH] list_for_each_rcu must die: audit

2008-05-17 03:30:23 -04:00

audit.c

[PATCH] remove useless argument type in audit_filter_user()

2008-06-24 23:36:35 -04:00

audit.h

[PATCH 1/2] audit: move extern declarations to audit.h

2008-04-28 06:28:04 -04:00

auditfilter.c

[PATCH] remove useless argument type in audit_filter_user()

2008-06-24 23:36:35 -04:00

auditsc.c

x86_64 syscall audit fast-path

2008-07-23 17:47:32 -07:00

backtracetest.c

backtrace: replace timer with tasklet + completions

2008-06-27 18:09:16 +02:00

bounds.c

Add kbuild.h that contains common definitions for kbuild users

2008-04-29 08:06:29 -07:00

capability.c

security: filesystem capabilities refactor kernel code

2008-07-24 10:47:22 -07:00

cgroup_debug.c

CGroup API files: move "releasable" to cgroup_debug subsystem

2008-04-29 08:06:09 -07:00

cgroup.c

[PATCH] get rid of indirect users of namei.h

2008-07-26 20:53:42 -04:00

compat.c

ntp: support for TAI

2008-05-01 08:03:59 -07:00

configs.c

kernel: use non-racy method for proc entries creation

2008-04-29 08:06:22 -07:00

cpu.c

Merge branch 'linus' into cpus4096

2008-07-28 23:32:00 +02:00

cpuset.c

cpuset: two minor code-cleanups

2008-07-25 10:53:38 -07:00

delayacct.c

per-task-delay-accounting: update taskstats for memory reclaim delay

2008-07-25 10:53:47 -07:00

dma-coherent.c

dma-coherent: add documentation to new interfaces

2008-07-20 21:22:00 +02:00

dma.c

kernel: use non-racy method for proc entries creation

2008-04-29 08:06:22 -07:00

exec_domain.c

[PATCH] kill altroot

2008-07-26 20:53:20 -04:00

exit.c

task IO accounting: improve code readability

2008-07-27 09:58:20 -07:00

extable.c

…

fork.c

mmu-notifiers: core

2008-07-28 16:30:21 -07:00

futex_compat.c

futex_compat __user annotation

2008-03-30 14:18:41 -07:00

futex.c

futexes: fix fault handling in futex_lock_pi

2008-06-23 13:31:15 +02:00

hrtimer.c

Merge branch 'generic-ipi' into generic-ipi-for-linus

2008-07-15 21:55:59 +02:00

itimer.c

…

kallsyms.c

kallsyms: fix potential overflow in binary search

2008-07-25 10:53:27 -07:00

Kconfig.hz

sched: fix hrtick & generic-ipi dependency

2008-07-23 11:18:28 +02:00

Kconfig.preempt

…

kexec.c

kexec jump: save/restore device state

2008-07-26 12:00:04 -07:00

kfifo.c

…

kgdb.c

kgdb: sparse fix

2008-06-24 10:52:55 -05:00

kmod.c

call_usermodehelper(): increase reliability

2008-07-25 10:53:28 -07:00

kprobes.c

kprobes: remove redundant config check

2008-07-25 10:53:30 -07:00

ksysfs.c

…

kthread.c

tracehook: wait_task_inactive

2008-07-26 12:00:09 -07:00

latencytop.c

kernel: use non-racy method for proc entries creation

2008-04-29 08:06:22 -07:00

lockdep_internals.h

lockdep: fix combinatorial explosion in lock subgraph traversal

2008-07-31 18:38:28 +02:00

lockdep_proc.c

lockdep: fix combinatorial explosion in lock subgraph traversal

2008-07-31 18:38:28 +02:00

lockdep.c

lockdep: lock_set_subclass - reset a held lock's subclass

2008-08-11 09:30:21 +02:00

Makefile

Merge branch 'linus' into core/generic-dma-coherent

2008-07-29 00:07:55 +02:00

marker.c

markers: use rcu_barrier_sched() and call_rcu_sched()

2008-07-25 10:53:45 -07:00

module.c

stop_machine: Wean existing callers off stop_machine_run()

2008-07-28 12:16:31 +10:00

mutex-debug.c

mutex-debug: check mutex magic before owner

2008-05-16 16:53:35 +02:00

mutex-debug.h

…

mutex.c

__mutex_lock_common: use signal_pending_state()

2008-06-10 11:45:09 +02:00

mutex.h

…

notifier.c

ipc: re-enable msgmni automatic recomputing msgmni if set to negative

2008-04-29 08:06:13 -07:00

ns_cgroup.c

cgroup_clone: use pid of newly created task for new cgroup

2008-07-25 10:53:37 -07:00

nsproxy.c

cgroup_clone: use pid of newly created task for new cgroup

2008-07-25 10:53:37 -07:00

panic.c

Add a WARN() macro; this is WARN_ON() + printk arguments

2008-07-25 10:53:29 -07:00

params.c

…

pid_namespace.c

bsdacct: switch from global bsd_acct_struct instance to per-pidns one

2008-07-25 10:53:47 -07:00

pid.c

pidns: remove now unused find_pid function.

2008-07-25 10:53:45 -07:00

pm_qos_params.c

pm_qos_params: BKL pushdown

2008-07-02 15:06:24 -06:00

posix-cpu-timers.c

posix-timers: print RT watchdog message

2008-05-24 18:49:22 +02:00

posix-timers.c

posix timers: release_posix_timer: kill the bogus put_task_struct(->it_process);

2008-07-25 10:53:38 -07:00

printk.c

printk ratelimiting rewrite

2008-07-25 10:53:29 -07:00

profile.c

build kernel/profile.o only when requested

2008-07-25 10:53:27 -07:00

ptrace.c

tracehook: wait_task_inactive

2008-07-26 12:00:09 -07:00

rcuclassic.c

stop_machine: Wean existing callers off stop_machine_run()

2008-07-28 12:16:31 +10:00

rcupdate.c

Merge branch 'generic-ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-07-15 14:12:03 -07:00

rcupreempt_trace.c

rcu: remove duplicated include in kernel/rcupreempt_trace.c

2008-05-19 10:03:39 +02:00

rcupreempt.c

Merge branch 'linus' into cpus4096

2008-07-16 00:29:07 +02:00

rcutorture.c

rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)

2008-06-26 09:24:33 +02:00

relay.c

relay: add buffer-only channels; useful for early logging

2008-07-26 12:00:04 -07:00

res_counter.c

cgroup files: convert res_counter_write() to be a cgroups write_string() handler

2008-07-25 10:53:36 -07:00

resource.c

kernel: use non-racy method for proc entries creation

2008-04-29 08:06:22 -07:00

rtmutex_common.h

…

rtmutex-debug.c

…

rtmutex-debug.h

…

rtmutex-tester.c

sysdev: Pass the attribute to the low level sysdev show/store function

2008-07-21 21:55:02 -07:00

rtmutex.c

…

rtmutex.h

…

rwsem.c

…

sched_clock.c

Merge branch 'sched/clock' into sched/devel

2008-07-14 12:19:13 +02:00

sched_cpupri.c

sched: use a 2-d bitmap for searching lowest-pri CPU

2008-06-06 15:19:28 +02:00

sched_cpupri.h

sched: fix the cpuprio count really

2008-06-06 15:19:44 +02:00

sched_debug.c

sched: add full schedstats to /proc/sched_debug

2008-06-27 14:31:31 +02:00

sched_fair.c

Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-07-23 19:36:53 -07:00

sched_features.h

sched: bias effective_load() error towards failing wake_affine().

2008-06-27 14:31:47 +02:00

sched_idletask.c

sched: make rt_sched_class, idle_sched_class static

2008-05-05 23:56:17 +02:00

sched_rt.c

lockdep: re-annotate scheduler runqueues

2008-08-11 09:30:22 +02:00

sched_stats.h

sched: fix accounting in task delay accounting & migration

2008-07-04 12:50:23 +02:00

sched.c

lockdep: re-annotate scheduler runqueues

2008-08-11 09:30:22 +02:00

seccomp.c

…

semaphore.c

mmiotrace broken in linux-next (8-bit writes only)

2008-07-01 10:14:06 +02:00

signal.c

tracehook: force signal_pending()

2008-07-26 12:00:09 -07:00

smp.c

Full conversion to early_initcall() interface, remove old interface

2008-07-26 12:00:04 -07:00

softirq.c

Full conversion to early_initcall() interface, remove old interface

2008-07-26 12:00:04 -07:00

softlockup.c

Full conversion to early_initcall() interface, remove old interface

2008-07-26 12:00:04 -07:00

spinlock.c

ftrace: lockdep notrace annotations

2008-05-23 20:39:40 +02:00

srcu.c

…

stacktrace.c

stacktrace: fix modular build, export print_stack_trace and save_stack_trace

2008-06-30 09:20:55 +02:00

stop_machine.c

stop_machine(): stop_machine_run() changed to use cpu mask

2008-07-28 12:16:30 +10:00

sys_ni.c

signalfd: fix undefined reference to `compat_sys_signalfd4' when !CONFIG_SIGNALFD

2008-07-25 11:35:41 -07:00

sys.c

kexec jump

2008-07-26 12:00:04 -07:00

sysctl_check.c

sysctl: check for bogus modes

2008-07-25 10:53:45 -07:00

sysctl.c

lost sysctl fix

2008-07-27 09:45:34 -07:00

taskstats.c

taskstats: remove initialization of static per-cpu variable

2008-07-25 10:53:47 -07:00

test_kprobes.c

…

time.c

Make constants in kernel/timeconst.h fixed 64 bits

2008-05-02 16:18:42 -07:00

timeconst.pl

Make constants in kernel/timeconst.h fixed 64 bits

2008-05-02 16:18:42 -07:00

timer.c

Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm

2008-07-14 16:06:58 -07:00

tsacct.c

task IO accounting: move all IO statistics in struct task_io_accounting

2008-07-27 16:12:28 -07:00

uid16.c

asmlinkage_protect replaces prevent_tail_call

2008-04-10 17:28:26 -07:00

user_namespace.c

eCryptfs: make key module subsystem respect namespaces

2008-04-29 08:06:07 -07:00

user.c

alloc_uid: cleanup

2008-04-30 08:29:53 -07:00

utsname_sysctl.c

…

utsname.c

kernel: explicitly include required header files under kernel/

2008-04-29 08:06:04 -07:00

wait.c

…

workqueue.c

workqueues: do CPU_UP_CANCELED if CPU_UP_PREPARE fails

2008-07-25 10:53:41 -07:00