Steven Rostedt 4db6055ac0 ftrace: Fix memory leak with function graph and cpu hotplug ... commit 868baf07b1 upstream. When the fuction graph tracer starts, it needs to make a special stack for each task to save the real return values of the tasks. All running tasks have this stack created, as well as any new tasks. On CPU hot plug, the new idle task will allocate a stack as well when init_idle() is called. The problem is that cpu hotplug does not create a new idle_task. Instead it uses the idle task that existed when the cpu went down. ftrace_graph_init_task() will add a new ret_stack to the task that is given to it. Because a clone will make the task have a stack of its parent it does not check if the task's ret_stack is already NULL or not. When the CPU hotplug code starts a CPU up again, it will allocate a new stack even though one already existed for it. The solution is to treat the idle_task specially. In fact, the function_graph code already does, just not at init_idle(). Instead of using the ftrace_graph_init_task() for the idle task, which that function expects the task to be a clone, have a separate ftrace_graph_init_idle_task(). Also, we will create a per_cpu ret_stack that is used by the idle task. When we call ftrace_graph_init_idle_task() it will check if the idle task's ret_stack is NULL, if it is, then it will assign it the per_cpu ret_stack. Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2011-03-23 13:16:39 -07:00
..
gcov	gcov: fix null-pointer dereference for certain module types	2010-09-20 13:17:53 -07:00
irq	genirq: Disable the SHIRQ_DEBUG call in request_threaded_irq for now	2011-03-02 09:46:55 -05:00
power	PM / Hibernate: Return error code when alloc_image_page() fails	2011-03-02 09:46:50 -05:00
time	clockevents: Prevent oneshot mode when broadcast device is periodic	2011-03-07 15:17:54 -08:00
trace	ftrace: Fix memory leak with function graph and cpu hotplug	2011-03-23 13:16:39 -07:00
.gitignore
acct.c	bsdacct: fix uid/gid misreporting	2009-12-18 14:03:52 -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	fix more leaks in audit_tree.c tag_chunk()	2010-01-18 10:19:50 -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	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	sched: Remove remaining USER_SCHED code	2011-02-17 15:37:19 -08:00
cgroup_freezer.c	Freezer: Fix buggy resume test for tasks frozen with cgroup freezer	2010-04-26 07:41:17 -07:00
cgroup.c	cgroups: fix 2.6.32 regression causing BUG_ON() in cgroup_diput()	2010-01-18 10:19:32 -08:00
compat.c	compat: Make compat_alloc_user_space() incorporate the access_ok()	2010-09-20 13:17:57 -07:00
configs.c
cpu.c	sched: _cpu_down(): Don't play with current->cpus_allowed	2010-09-20 13:18:08 -07:00
cpuset.c	cpuset: add a missing unlock in cpuset_write_resmask()	2011-03-14 14:29:52 -07:00
cred.c	CRED: Fix memory and refcount leaks upon security_prepare_creds() failure	2011-03-02 09:46:39 -05:00
delayacct.c	headers: taskstats_kern.h trim	2009-09-18 09:48:52 -07:00
dma.c
exec_domain.c
exit.c	sched: Remove remaining USER_SCHED code	2011-02-17 15:37:19 -08:00
extable.c
fork.c	sched: Fix fork vs hotplug vs cpuset namespaces	2010-09-20 13:18:02 -07:00
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: Fix errors in nested key ref-counting	2010-11-22 10:47:31 -08:00
groups.c	kernel/groups.c: fix integer overflow in groups_search	2010-09-20 13:17:54 -07:00
hrtimer.c	hrtimer: Preserve timer state in remove_hrtimer()	2010-10-28 21:44:01 -07:00
hung_task.c	sysctl: remove "struct file *" argument of ->proc_handler	2009-09-24 07:21:04 -07:00
itimer.c	itimers: Add tracepoints for itimer	2009-08-29 14:10:07 +02:00
kallsyms.c	kallsyms: use new arch_is_kernel_text()	2009-09-23 07:39:30 -07:00
Kconfig.freezer
Kconfig.hz
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	sysrq, intel_fb: fix sysrq g collision	2009-05-15 07:56:24 -05:00
kmod.c	Revert "kmod: fix race in usermodehelper code"	2009-09-23 18:12:10 -07:00
kprobes.c	const: constify remaining file_operations	2009-10-01 16:11:11 -07:00
ksysfs.c	sched: Remove USER_SCHED	2011-02-17 15:37:19 -08:00
kthread.c	cpuset: fix the problem that cpuset_mem_spread_node() returns an offline node	2010-04-01 15:58:46 -07:00
latencytop.c	latencytop: fix per task accumulator	2010-12-09 13:26:51 -08:00
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.c	Revert "lockdep: fix incorrect percpu usage"	2010-06-01 09:45:46 -07:00
Makefile	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
module.c	dynamic debug: move ddebug_remove_module() down into free_module()	2010-08-02 10:20:47 -07:00
mutex-debug.c	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
mutex-debug.h
mutex.c	mutex: Fix optimistic spinning vs. BKL	2010-07-05 11:10:31 -07:00
mutex.h
notifier.c
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	param: fix setting arrays of bool	2009-10-29 08:56:20 +10:30
perf_event.c	Fix racy use of anon_inode_getfd() in perf_event.c	2010-07-05 11:10:30 -07:00
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
posix-cpu-timers.c	itimers: Add tracepoints for itimer	2009-08-29 14:10:07 +02:00
posix-timers.c	posix_timer: Fix error path in timer_create	2010-07-05 11:10:30 -07:00
printk.c	nohz: Fix printk_needs_cpu() return value on offline cpus	2011-01-07 14:43:03 -08:00
profile.c	profile: fix stats and data leakage	2010-05-26 14:29:18 -07:00
ptrace.c	ptrace: use safer wake up on ptrace_detach()	2011-02-17 15:37:03 -08:00
rcupdate.c	rcu: Move rcu_barrier() to rcutree	2009-10-07 08:11:20 +02:00
rcutorture.c	rcu: Clean up code to address Ingo's checkpatch feedback	2009-09-23 19:46:30 +02:00
rcutree_plugin.h	rcu: Remove inline from forward-referenced functions	2009-12-18 14:03:04 -08:00
rcutree_trace.c	rcu: Make hot-unplugged CPU relinquish its own RCU callbacks	2009-10-07 08:11:20 +02:00
rcutree.c	rcu: Fix note_new_gpnum() uses of ->gpnum	2009-12-18 14:03:01 -08:00
rcutree.h	rcu: Remove inline from forward-referenced functions	2009-12-18 14:03:04 -08:00
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	walk system ram range	2009-09-23 07:39:41 -07:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c	rtmutex: Avoid deadlock in rt_mutex_start_proxy_lock()	2009-08-06 05:50:21 +02:00
rtmutex.h
rwsem.c
sched_clock.c	sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK	2010-01-22 15:18:30 -08:00
sched_cpupri.c	sched: Add new prio to cpupri before removing old prio	2009-08-02 14:26:09 +02:00
sched_cpupri.h
sched_debug.c	sched: Remove remaining USER_SCHED code	2011-02-17 15:37:19 -08:00
sched_fair.c	sched: Fix wake_affine() vs RT tasks	2011-02-17 15:37:30 -08:00
sched_features.h	sched: Remove irq time from available CPU power	2011-02-17 15:37:27 -08:00
sched_idletask.c	sched: Fix TASK_WAKING vs fork deadlock	2010-09-20 13:18:09 -07:00
sched_rt.c	sched: Do not account irq time to current task	2011-02-17 15:37:26 -08:00
sched_stats.h
sched.c	ftrace: Fix memory leak with function graph and cpu hotplug	2011-03-23 13:16:39 -07:00
seccomp.c
semaphore.c
signal.c	signals: check_kill_permission(): don't check creds if same_thread_group()	2010-07-05 11:10:56 -07:00
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	2010-08-10 10:20:45 -07:00
slow-work.h	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
smp.c	kernel/smp.c: fix smp_call_function_many() SMP race	2011-02-17 15:37:07 -08:00
softirq.c	sched: Call tick_check_idle before __irq_enter	2011-02-17 15:37:27 -08:00
softlockup.c	softlockup: Stop spurious softlockup messages due to overflow	2010-04-01 15:58:47 -07:00
spinlock.c	locking: Allow arch-inlined spinlocks	2009-08-31 18:08:50 +02:00
srcu.c
stacktrace.c
stop_machine.c
sys_ni.c	Merge branch 'master' of /home/davem/src/GIT/linux-2.6/	2009-09-24 15:13:11 -07:00
sys.c	sched: Remove USER_SCHED	2011-02-17 15:37:19 -08:00
sysctl_check.c	NET: fix oops at bootime in sysctl code	2010-02-09 04:51:02 -08:00
sysctl.c	kernel/sysctl.c: fix stable merge error in NOMMU mmap_min_addr	2010-01-18 10:19:49 -08:00
taskstats.c	genetlink: make netns aware	2009-07-12 14:03:27 -07:00
test_kprobes.c
time.c	time: Prevent 32 bit overflow with set_normalized_timespec()	2009-09-15 10:17:30 +02:00
timeconst.pl
timer.c	nohz: Fix get_next_timer_interrupt() vs cpu hotplug	2011-01-07 14:43:03 -08:00
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.c	kernel/user.c: add lock release annotation on free_user()	2011-02-17 15:37:31 -08:00
utsname_sysctl.c	sysctl: remove "struct file *" argument of ->proc_handler	2009-09-24 07:21:04 -07:00
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	workqueue: fix race condition in schedule_on_each_cpu()	2009-11-17 17:40:33 -08:00