Oleg Nesterov 6a1bdc1b57 sched: _cpu_down(): Don't play with current->cpus_allowed ...

_cpu_down() changes the current task's affinity and then recovers it at
the end. The problems are well known: we can't restore old_allowed if it
was bound to the now-dead-cpu, and we can race with the userspace which
can change cpu-affinity during unplug.

_cpu_down() should not play with current->cpus_allowed at all. Instead,
take_cpu_down() can migrate the caller of _cpu_down() after __cpu_disable()
removes the dying cpu from cpu_online_mask.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100315091023.GA9148@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2010-04-02 20:12:03 +02:00

..

gcov

microblaze: Enable GCOV_PROFILE_ALL

2009-09-21 14:29:21 +02:00

irq

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

2010-03-26 15:09:06 -07:00

power

mm/pm: force GFP_NOIO during suspend/hibernation and resume

2010-03-06 11:26:26 -08:00

time

Merge branch 'linus' into sched/core

2010-04-02 20:03:08 +02:00

trace

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

2010-03-26 15:10:13 -07:00

.gitignore

…

acct.c

copy_signal() cleanup: kill taskstats_tgid_init() and acct_init_pacct()

2010-03-12 15:52:39 -08:00

async.c

async: Fix lack of boot-time console due to insufficient synchronization

2009-06-08 12:31:53 -07:00

audit_tree.c

new helper: iterate_mounts()

2010-03-03 14:07:57 -05:00

audit_watch.c

Audit: reorganize struct audit_watch to save 8 bytes

2009-09-24 03:50:25 -04:00

audit.c

Fix misspelling of "should" and "shouldn't" in comments.

2010-02-05 12:22:30 +01:00

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

Lose the first argument of audit_inode_child()

2010-02-08 14:38:36 -05:00

backtracetest.c

…

bounds.c

kbuild: move bounds.h to include/generated

2009-12-12 13:08:14 +01:00

capability.c

sched: Remove remaining USER_SCHED code

2010-04-02 20:12:00 +02:00

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: remove duplicate include

2010-03-24 16:31:19 -07:00

compat.c

signals: implement sys_rt_tgsigqueueinfo

2009-04-30 19:24:24 +02:00

configs.c

…

cpu.c

sched: _cpu_down(): Don't play with current->cpus_allowed

2010-04-02 20:12:03 +02:00

cpuset.c

sched: Kill the broken and deadlockable cpuset_lock/cpuset_cpus_allowed_locked code

2010-04-02 20:12:01 +02:00

cred.c

sched: Remove remaining USER_SCHED code

2010-04-02 20:12:00 +02:00

delayacct.c

headers: taskstats_kern.h trim

2009-09-18 09:48:52 -07:00

dma.c

…

early_res.c

x86: Do not free zero sized per cpu areas

2010-03-29 18:55:40 +02:00

elfcore.c

elf coredump: add extended numbering support

2010-03-06 11:26:46 -08:00

exec_domain.c

Get rid of indirect include of fs_struct.h

2009-03-31 23:00:27 -04:00

exit.c

sched: Remove remaining USER_SCHED code

2010-04-02 20:12:00 +02:00

extable.c

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

2009-04-05 11:04:19 -07:00

fork.c

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

2010-03-13 14:43:01 -08:00

freezer.c

sched: fix nr_uninterruptible accounting of frozen tasks really

2009-07-18 14:19:53 +02:00

futex_compat.c

futex: Protect pid lookup in compat code with RCU

2009-12-09 14:22:14 +01:00

futex.c

futex: Handle futex value corruption gracefully

2010-02-03 15:13:22 +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

Merge branch 'perf/core' into perf/urgent

2010-03-04 11:47:52 +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

rcu: provide RCU options on non-preempt architectures too

2008-12-25 09:31:28 +01:00

kexec.c

percpu: add __percpu sparse annotations to core kernel subsystems

2010-02-17 11:17:38 +09:00

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: Calculate the index correctly when freeing the out-of-line execution slot

2010-03-11 14:06:16 +01:00

ksysfs.c

Merge branch 'for-next' into for-linus

2010-03-08 16:55:37 +01:00

kthread.c

cpuset: fix the problem that cpuset_mem_spread_node() returns an offline node

2010-03-24 16:31:21 -07:00

latencytop.c

sched, latencytop: incorporate review feedback from Andrew Morton

2009-02-11 10:18:04 +01:00

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: move state bit definitions around

2009-02-14 23:27:59 +01:00

lockdep.c

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

2010-03-18 16:52:46 -07:00

Makefile

elf coredump: replace ELF_CORE_EXTRA_* macros by functions

2010-03-06 11:26:45 -08:00

module.c

sysfs: Use sysfs_attr_init and sysfs_bin_attr_init on module dynamic attributes

2010-03-07 17:04:51 -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

mutex: implement adaptive spinning

2009-01-14 18:09:02 +01:00

notifier.c

sched: Use lockdep-based checking on rcu_dereference()

2010-02-25 10:34:26 +01:00

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: remove INIT_NSPROXY()

2010-03-12 15:52:40 -08:00

padata.c

padata: Allocate the cpumask for the padata instance

2010-03-04 13:30:22 +08:00

panic.c

panic: fix panic_timeout accuracy when running on a hypervisor

2010-03-06 11:26:33 -08:00

params.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2010-03-12 16:04:50 -08:00

perf_event.c

perf: Fix unexported generic perf_arch_fetch_caller_regs

2010-03-17 12:26:49 +01:00

pid_namespace.c

pid_ns: zap_pid_ns_processes: use SEND_SIG_NOINFO instead of force_sig()

2010-03-12 15:52:40 -08:00

pid.c

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

2010-03-13 14:43:01 -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

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

2010-03-26 15:10:38 -07:00

posix-timers.c

posix-timers.c: Don't export local functions

2010-02-05 14:54:10 +01:00

printk.c

printk: avoid warning when CONFIG_PRINTK is disabled

2010-03-06 11:26:33 -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: Fix ptrace_regset() comments and diagnose errors specifically

2010-02-23 13:45:26 -08:00

range.c

x86: Change range end to start+size

2010-02-10 17:47:17 -08:00

rcupdate.c

rcu: Make rcu_read_lock_bh_held() allow for disabled BH

2010-03-16 09:57:49 +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

2010-03-03 07:34:18 -08:00

rcutree_plugin.h

rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU

2010-02-28 09:17:42 +01:00

rcutree_trace.c

rcu: Stop overflowing signed integers

2010-02-25 10:34:57 +01:00

rcutree.c

rcu: Fix accelerated grace periods for last non-dynticked CPU

2010-02-27 09:53:52 +01:00

rcutree.h

rcu: Increase RCU CPU stall timeouts if PROVE_RCU

2010-03-11 13:38:01 +01:00

relay.c

splice: comparing unsigned int < 0

2010-03-06 11:26:32 -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: add interfaces that return conflict information

2010-03-23 13:33:50 -07:00

rtmutex_common.h

rt_mutex: add proxy lock routines

2009-04-06 11:14:02 +02:00

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

Merge branch 'for-next' into for-linus

2010-03-08 16:55:37 +01:00

sched_cpupri.h

sched: Convert cpupri lock to raw_spinlock

2009-12-14 23:55:33 +01:00

sched_debug.c

sched: Remove remaining USER_SCHED code

2010-04-02 20:12:00 +02:00

sched_fair.c

Merge branch 'linus' into sched/core

2010-04-02 20:03:08 +02:00

sched_features.h

sched: Remove ASYM_GRAN feature

2010-03-11 18:32:53 +01:00

sched_idletask.c

sched: Remove the sched_class load_balance methods

2010-01-21 13:40:09 +01:00

sched_rt.c

Merge branch 'linus' into sched/core

2010-04-02 20:03:08 +02:00

sched_stats.h

sched: remove unused fields from struct rq

2009-03-24 23:16:51 +01:00

sched.c

sched: _cpu_down(): Don't play with current->cpus_allowed

2010-04-02 20:12:03 +02:00

seccomp.c

x86-64: seccomp: fix 32/64 syscall hole

2009-03-02 15:41:30 -08:00

semaphore.c

…

signal.c

kernel core: use helpers for rlimits

2010-03-06 11:26:33 -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

slow-work: use get_ref wrapper instead of directly calling get_ref

2010-03-29 09:13:30 -07:00

slow-work.h

SLOW_WORK: CONFIG_SLOW_WORK_PROC should be CONFIG_SLOW_WORK_DEBUG

2010-03-29 09:14:47 -07:00

smp.c

generic-ipi: Optimize accesses by using DEFINE_PER_CPU_SHARED_ALIGNED for IPI data

2010-01-18 09:02:59 +01:00

softirq.c

hrtimer, softirq: Fix hrtimer->softirq trampoline

2010-02-03 18:17:40 +01:00

softlockup.c

softlockup: Stop spurious softlockup messages due to overflow

2010-03-21 19:30:13 +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

stacktrace: provide save_stack_trace_tsk() weak alias

2008-12-25 11:44:43 +01:00

stop_machine.c

percpu: add __percpu sparse annotations to core kernel subsystems

2010-02-17 11:17:38 +09:00

sys_ni.c

Add generic sys_ipc wrapper

2010-03-12 15:52:32 -08:00

sys.c

Add generic sys_olduname()

2010-03-12 15:52:32 -08:00

sysctl_binary.c

Switch may_open() and break_lease() to passing O_...

2010-03-03 13:00:21 -05:00

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 extern cleanup: lockdep

2010-03-12 15:53:10 -08:00

taskstats.c

const: struct nla_policy

2010-02-18 14:30:18 -08:00

test_kprobes.c

kprobes: add tests for register_kprobes

2009-01-06 15:59:20 -08:00

time.c

Revert "time: Remove xtime_cache"

2009-12-22 14:10:37 -08:00

timeconst.pl

…

timer.c

timer stats: Fix del_timer_sync() and try_to_del_timer_sync()

2010-03-12 19:11:29 +01:00

tracepoint.c

trivial: fix typo "to to" in multiple files

2009-09-21 15:14:55 +02:00

tsacct.c

mm: clean up mm_counter

2010-03-06 11:26:23 -08:00

uid16.c

headers: utsname.h redux

2009-09-23 18:13:10 -07:00

up.c

smp_call_function_single(): be slightly less stupid, fix #2

2009-01-12 16:04:37 +01:00

user_namespace.c

Fix recursive lock in free_uid()/free_user_ns()

2009-02-27 16:26:21 -08:00

user-return-notifier.c

core: Clean up user return notifers use of per_cpu

2009-12-02 10:22:59 +01:00

user.c

sched: Remove remaining USER_SCHED code

2010-04-02 20:12:00 +02:00

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