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Oleg Nesterov 08d2c30ce9 signals: send_sig_info: don't take tasklist_lock 
The comment in send_sig_info() is wrong, tasklist_lock can't help.

The caller must ensure the task can't go away, otherwise ->sighand can be NULL
even before we take the lock.

p->sighand could be changed by exec(), but I can't imagine how it is possible
to prevent exit(), but not exec().

Since the things seem to work, I assume all callers are correct.  However,
drm_vbl_send_signals() looks broken.  block_all_signals() which is solely used
by drm is definitely broken.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30 08:29:35 -07:00
..
irq
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
power
PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch
2008-04-28 08:58:36 -07:00
time
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
.gitignore
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
bsd_acct: using task_struct->tgid is not right in pid-namespaces
2008-03-24 19:22:20 -07:00
audit_tree.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
audit.c
[patch 2/2] Use find_task_by_vpid in audit code
2008-04-28 06:28:30 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current
2008-04-29 11:41:22 -07:00
auditsc.c
[PATCH] new predicate - AUDIT_FILETYPE
2008-04-28 06:28:37 -04:00
backtracetest.c
…
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
…
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
cgroup.c
cgroups: add an owner to the mm_struct
2008-04-29 08:06:10 -07:00
compat.c
generic: reduce stack pressure in sched_affinity
2008-04-19 19:44:59 +02:00
configs.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
cpu.c
simplify cpu_hotplug_begin()/put_online_cpus()
2008-04-29 08:06:11 -07:00
cpuset.c
Cpuset hardwall flag: add a mem_hardwall flag to cpusets
2008-04-29 08:06:11 -07:00
delayacct.c
…
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
…
exit.c
signals: do_group_exit(): use signal_group_exit() more consistently
2008-04-30 08:29:33 -07:00
extable.c
…
fork.c
procfs task exe symlink
2008-04-29 08:06:17 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
NULL noise: fs/*, mm/*, kernel/*
2008-03-30 14:18:41 -07:00
hrtimer.c
hrtimer: raise softirq unlocked to avoid circular lock dependency
2008-04-28 22:22:21 +02:00
itimer.c
ITIMER_REAL: convert to use struct pid
2008-02-08 09:22:29 -08:00
kallsyms.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
Kconfig.hz
…
Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
vmcoreinfo: add page flags values
2008-04-28 08:58:23 -07:00
kfifo.c
…
kgdb.c
kgdb: always use icache flush for sw breakpoints
2008-04-17 20:05:43 +02:00
kmod.c
generic: use new set_cpus_allowed_ptr function
2008-04-19 19:44:58 +02:00
kprobes.c
kprobes: add (un)register_jprobes for batch registration
2008-04-28 08:58:32 -07:00
ksysfs.c
…
kthread.c
kthread: call wake_up_process() without the lock being held
2008-04-29 08:06:04 -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_proc.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep.c
Subject: lockdep: include all lock classes in all_lock_classes
2008-02-25 23:03:02 +01:00
Makefile
sysctl: allow embedded targets to disable sysctl_check.c
2008-04-29 08:06:22 -07:00
marker.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
module.c
kernel: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:04 -04:00
mutex-debug.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
mutex-debug.h
…
mutex.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
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
cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h>
2008-04-29 08:06:07 -07:00
nsproxy.c
ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)
2008-04-29 08:06:14 -07:00
panic.c
Taint kernel after WARN_ON(condition)
2008-04-29 08:05:59 -07:00
params.c
Add new string functions strict_strto* and convert kernel params to use them
2008-02-08 09:22:41 -08:00
pid_namespace.c
kernel: fix integer as NULL pointer warnings
2008-04-28 17:29:18 -07:00
pid.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
pm_qos_params.c
…
posix-cpu-timers.c
posix-timers: fix shadowed variables
2008-04-17 12:22:30 +02:00
posix-timers.c
kernel: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:04 -04:00
printk.c
isolate ratelimit from printk.c for other use
2008-04-29 08:06:06 -07:00
profile.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
ptrace.c
ptrace: conditionalize compat_ptrace_request
2008-04-28 14:14:36 -07:00
rcuclassic.c
…
rcupdate.c
rcupdate: fix comment
2008-02-13 16:21:18 -08:00
rcupreempt_trace.c
…
rcupreempt.c
generic: reduce stack pressure in sched_affinity
2008-04-19 19:44:59 +02:00
rcutorture.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
relay.c
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
2008-04-29 08:18:03 -07:00
res_counter.c
memcgroup: add the max_usage member on the res_counter
2008-04-29 08:06:10 -07:00
resource.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
rtmutex_common.h
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.c
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.h
…
rtmutex-tester.c
…
rtmutex.c
hrtimer: more hrtimer_init_sleeper() fallout.
2008-02-13 15:45:36 +01:00
rtmutex.h
…
rwsem.c
…
sched_debug.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
sched_fair.c
sched: debug: show a weight tree
2008-04-19 19:45:00 +02:00
sched_features.h
sched: /debug/sched_features
2008-04-19 19:45:00 +02:00
sched_idletask.c
…
sched_rt.c
sched: rt-group: optimize dequeue_rt_stack
2008-04-19 19:45:00 +02:00
sched_stats.h
cpumask: use new cpus_scnprintf function
2008-04-19 19:44:59 +02:00
sched.c
CGroups _s64 files: use read_s64/write_s64 in CFS cgroup for rt_runtime file
2008-04-29 08:06:09 -07:00
seccomp.c
…
semaphore.c
Improve semaphore documentation
2008-04-17 10:43:01 -04:00
signal.c
signals: send_sig_info: don't take tasklist_lock
2008-04-30 08:29:35 -07:00
softirq.c
tasklets: execute tasklets in the same order they were queued
2008-04-19 19:44:58 +02:00
softlockup.c
softlockup: fix task state setting
2008-02-29 18:46:53 +01:00
spinlock.c
…
srcu.c
…
stacktrace.c
…
stop_machine.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial
2008-04-21 16:36:46 -07:00
sys_ni.c
…
sys.c
k_getrusage: don't take rcu_read_lock()
2008-04-30 08:29:34 -07:00
sysctl_check.c
constify tables in kernel/sysctl_check.c
2008-02-08 09:22:31 -08:00
sysctl.c
sysctl: add the ->permissions callback on the ctl_table_root
2008-04-29 08:06:23 -07:00
taskstats.c
…
test_kprobes.c
…
time.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
timeconst.pl
timeconst.pl: correct reversal of USEC_TO_HZ and HZ_TO_USEC
2008-02-12 14:29:26 -08:00
timer.c
timers: simplify lockdep handling
2008-04-17 12:22:31 +02:00
tsacct.c
…
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
keys: don't generate user and user session keyrings unless they're accessed
2008-04-29 08:06:17 -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
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
workqueue.c
cleanup_workqueue_thread: remove the unneeded "cpu" parameter
2008-04-29 08:06:11 -07:00