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Frederic Weisbecker 234da7bcdc sched: Teach might_sleep() about preemptible RCU 
In practice, it is harmless to voluntarily sleep in a
rcu_read_lock() section if we are running under preempt rcu, but
it is illegal if we build a kernel running non-preemptable rcu.

Currently, might_sleep() doesn't notice sleepable operations
under rcu_read_lock() sections if we are running under
preemptable rcu because preempt_count() is left untouched after
rcu_read_lock() in this case. But we want developers who test
their changes under such config to notice the "sleeping while
atomic" issues.

So we add rcu_read_lock_nesting to prempt_count() in
might_sleep() checks.

[ v2: Handle rcu-tiny ]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1260991265-8451-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-17 09:46:44 +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
clockevents: Convert to raw_spinlock
2009-12-14 23:55:34 +01:00
trace
locking: Convert __raw_spin* functions to arch_spin*
2009-12-14 23:55:32 +01:00
.gitignore
…
acct.c
bsdacct: fix uid/gid misreporting
2009-12-15 08:53:10 -08:00
async.c
…
audit_tree.c
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
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
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
auditfilter.c
Audit: clean up all op= output to include string quoting
2009-06-24 00:00:52 -04:00
auditsc.c
Audit: rearrange audit_context to save 16 bytes per struct
2009-09-24 03:50:26 -04:00
backtracetest.c
…
bounds.c
…
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
cgroup: fix strstrip() misuse
2009-10-29 07:39:25 -07:00
compat.c
…
configs.c
…
cpu.c
sched: Fix set_cpu_active() in cpu_down()
2009-12-16 19:01:53 +01:00
cpuset.c
sched: Fix balance vs hotplug race
2009-12-06 21:10:56 +01:00
cred-internals.h
…
cred.c
creds_are_invalid() needs to be exported for use by modules:
2009-09-23 11:02:26 -07:00
delayacct.c
headers: taskstats_kern.h trim
2009-09-18 09:48:52 -07:00
dma.c
…
exec_domain.c
…
exit.c
sched: Convert pi_lock to raw_spinlock
2009-12-14 23:55:33 +01:00
extable.c
…
fork.c
sched: Convert pi_lock to raw_spinlock
2009-12-14 23:55:33 +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
rtmutes: Convert rtmutex.lock to raw_spinlock
2009-12-14 23:55:33 +01:00
groups.c
groups: move code to kernel/groups.c
2009-06-16 19:47:48 -07:00
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_event: Convert to raw_spinlock
2009-12-14 23:55:34 +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
kexec: fix omitting offset in extended crashkernel syntax
2009-07-29 19:10:34 -07:00
kfifo.c
kfifo: Use "const" definitions
2009-09-19 13:13:17 -07:00
kgdb.c
kgdb: Always process the whole breakpoint list on activate or deactivate
2009-12-11 08:43:20 -06:00
kmod.c
security: report the module name to security_module_request
2009-11-10 09:33:46 +11:00
kprobes.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-05 15:30:21 -08:00
ksysfs.c
…
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
locking: Convert __raw_spin* functions to arch_spin*
2009-12-14 23:55:32 +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
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2009-12-14 09:58:24 -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
nsproxy: extract create_nsproxy()
2009-06-18 13:03:56 -07:00
panic.c
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-10-08 12:16:35 -07:00
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_event: Convert to raw_spinlock
2009-12-14 23:55:34 +01:00
pid_namespace.c
pidns: deny CLONE_PARENT|CLONE_NEWPID combination
2009-09-24 07:21:04 -07:00
pid.c
mm: also use alloc_large_system_hash() for the PID hash table
2009-09-22 07:17:38 -07:00
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 branch 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-05 09:50:22 -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: Re-arrange code to reduce #ifdef pain
2009-11-22 18:58:16 +01:00
rcutiny.c
rcu: Eliminate unneeded function wrapping
2009-11-22 18:58:16 +01:00
rcutorture.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2009-12-14 09:58:24 -08:00
rcutree_plugin.h
rcu: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +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: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +01:00
rcutree.h
rcu: Add expedited grace-period support for preemptible RCU
2009-12-03 11:35:25 +01:00
relay.c
const: mark struct vm_struct_operations
2009-09-27 11:39:25 -07:00
res_counter.c
memcg: some modification to softlimit under hierarchical memory reclaim.
2009-10-01 16:11:13 -07:00
resource.c
resources: when allocate_resource() fails, leave resource untouched
2009-11-04 13:06:46 -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: Remove the cfs_rq dependency from set_task_cpu()
2009-12-16 19:01:58 +01:00
sched_features.h
sched: Discard some old bits
2009-12-09 10:03:07 +01:00
sched_idletask.c
Merge branch 'linus' into sched/urgent
2009-12-16 18:33:49 +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: Teach might_sleep() about preemptible RCU
2009-12-17 09:46:44 +01:00
seccomp.c
…
semaphore.c
…
signal.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-05 15:30:21 -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
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-15 09:02:01 -08:00
softirq.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2009-12-14 09:58:24 -08:00
softlockup.c
percpu: make percpu symbols under kernel/ and mm/ unique
2009-10-29 22:34:13 +09:00
spinlock.c
locking: Cleanup the name space completely
2009-12-14 23:55:33 +01:00
srcu.c
rcu: Add synchronize_srcu_expedited()
2009-10-26 09:40:30 +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 "warning: do-while statement is not a compound statement" noise
2009-12-15 08:53:26 -08:00
sysctl_binary.c
sysctl binary: Reorder the tests to process wild card entries first.
2009-11-12 01:42:31 -08:00
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
'sysctl_max_map_count' should be non-negative
2009-12-15 08:53:23 -08:00
taskstats.c
genetlink: make netns aware
2009-07-12 14:03:27 -07:00
test_kprobes.c
…
time.c
Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-12-08 19:27:08 -08:00
timeconst.pl
…
timer.c
Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-09-23 09:46:15 -07:00
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
utsns: extract creeate_uts_ns()
2009-06-18 13:03:55 -07:00
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