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Li Zefan 7a46c594bf cpuacct: reduce one NULL check in fast-path 
Impact: micro-optimization

In cpuacct_charge(), task_ca() will never return NULL, so change
for(...) to do { } while(...) to save one NULL check.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Bharata B Rao <bharata@linux.vnet.ibm.com>
LKML-Reference: <49B863F5.2060400@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-13 04:54:58 +01:00
..
irq
Merge commit 'v2.6.29-rc4' into core/percpu
2009-02-09 14:58:11 +01:00
power
PM: Split up sysdev_[suspend|resume] from device_power_[down|up]
2009-02-22 10:33:44 -08:00
time
hrtimers: allow the hot-unplugging of all cpus
2009-01-30 22:35:29 +01:00
trace
tracing: limit the number of loops the ring buffer self test can make
2009-02-18 22:50:01 -05:00
.gitignore
…
acct.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
async.c
async: use list_move_tail
2009-02-08 10:00:26 -08:00
audit_tree.c
audit: validate comparison operations, store them in sane form
2009-01-04 15:14:42 -05:00
audit.c
[PATCH] fix broken timestamps in AVC generated by kernel threads
2008-12-09 02:27:41 -05:00
audit.h
fixing audit rule ordering mess, part 1
2009-01-04 15:14:41 -05:00
auditfilter.c
audit: validate comparison operations, store them in sane form
2009-01-04 15:14:42 -05:00
auditsc.c
make sure that filterkey of task,always rules is reported
2009-01-04 15:14:42 -05:00
backtracetest.c
…
bounds.c
…
capability.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
cgroup_debug.c
cgroups: fix probable race with put_css_set[_taskexit] and find_css_set
2008-10-20 08:52:38 -07:00
cgroup_freezer.c
freezer_cg: disable writing freezer.state of root cgroup
2008-11-12 17:17:16 -08:00
cgroup.c
cgroups: fix possible use after free
2009-02-18 15:37:54 -08:00
compat.c
Allow times and time system calls to return small negative values
2009-01-06 15:59:13 -08:00
configs.c
kernel/configs.c: remove useless comments
2008-10-20 08:52:34 -07:00
cpu.c
stop_machine/cpu hotplug: fix disable_nonboot_cpus
2009-01-07 11:36:14 -08:00
cpuset.c
cpuset: fix possible deadlock in async_rebuild_sched_domains
2009-01-19 02:44:00 +01:00
cred-internals.h
CRED: Inaugurate COW credentials
2008-11-14 10:39:23 +11:00
cred.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
2009-01-09 13:59:25 -08:00
delayacct.c
schedstat: consolidate per-task cpu runtime stats
2008-12-18 13:54:01 +01:00
dma-coherent.c
dma-coherent: Restore dma_alloc_from_coherent() large alloc fall back policy.
2009-01-21 18:51:53 +09:00
dma.c
kernel/dma.c: remove a CVS keyword
2008-10-16 11:21:30 -07:00
exec_domain.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
exit.c
Merge branch 'linus' into x86/apic
2009-02-13 09:44:22 +01:00
extable.c
Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-12-30 16:10:19 -08:00
fork.c
Merge branch 'linus' into core/percpu
2009-03-11 10:29:28 +01:00
freezer.c
freezer_cg: use thaw_process() in unfreeze_cgroup()
2008-10-30 11:38:45 -07:00
futex_compat.c
CRED: Use RCU to access another task's creds and to release a task's own creds
2008-11-14 10:39:19 +11:00
futex.c
futex: fix reference leak
2009-02-11 18:24:08 +01:00
hrtimer.c
hrtimer: prevent negative expiry value after clock_was_set()
2009-01-30 22:35:34 +01:00
itimer.c
timers: split process wide cpu clocks/timers
2009-02-05 13:04:33 +01:00
kallsyms.c
Revert "kbuild: strip generated symbols from *.ko"
2009-01-14 21:38:20 +01:00
Kconfig.freezer
container freezer: implement freezer cgroup subsystem
2008-10-20 08:52:34 -07:00
Kconfig.hz
sched: fix SCHED_HRTICK dependency
2008-07-28 14:37:38 +02:00
Kconfig.preempt
rcu: provide RCU options on non-preempt architectures too
2008-12-25 09:31:28 +01:00
kexec.c
Merge branch 'linus' into x86/apic
2009-02-22 20:05:19 +01:00
kfifo.c
…
kgdb.c
kgdb: call touch_softlockup_watchdog on resume
2008-10-06 13:50:59 -05:00
kmod.c
kmod: fix varargs kernel-doc
2009-01-06 15:59:27 -08:00
kprobes.c
kprobes: check CONFIG_FREEZER instead of CONFIG_PM
2009-01-16 14:32:17 -05:00
ksysfs.c
kernel/ksysfs.c:fix dependence on CONFIG_NET
2009-01-06 10:44:31 -08:00
kthread.c
tracepoints: add DECLARE_TRACE() and DEFINE_TRACE()
2008-11-16 09:01:36 +01:00
latencytop.c
KSYM_SYMBOL_LEN fixes
2008-12-10 08:01:54 -08:00
lockdep_internals.h
lockdep: build fix
2008-08-13 12:55:10 +02:00
lockdep_proc.c
lockstat: contend with points
2008-10-20 15:43:10 +02:00
lockdep.c
Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-12-30 16:10:19 -08:00
Makefile
PM: fix build for CONFIG_PM unset
2009-02-21 14:17:17 -08:00
marker.c
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
module.c
percpu, module: implement reserved allocation and use it for module percpu variables
2009-03-06 14:33:59 +09:00
mutex-debug.c
…
mutex-debug.h
…
mutex.c
mutex: __used is needed for function referenced only from inline asm
2008-11-24 10:00:28 +01:00
mutex.h
…
notifier.c
Merge commit 'v2.6.28-rc6' into core/debug
2008-11-26 08:22:50 +01:00
ns_cgroup.c
ns_cgroup: remove unused spinlock
2009-01-08 08:31:02 -08:00
nsproxy.c
User namespaces: set of cleanups (v2)
2008-11-24 18:57:41 -05:00
panic.c
stackprotector: update make rules
2009-02-10 00:41:54 +01:00
params.c
Fix compile warning in kernel/params.c
2008-10-23 12:09:00 -07:00
pid_namespace.c
pid_ns: (BUG 11391) change ->child_reaper when init->group_leader exits
2008-09-02 19:21:38 -07:00
pid.c
pid: generalize task_active_pid_ns
2009-01-08 08:31:12 -08:00
pm_qos_params.c
pm_qos_requirement might sleep
2008-09-02 19:21:40 -07:00
posix-cpu-timers.c
timers: more consistently use clock vs timer
2009-02-13 13:04:05 +01:00
posix-timers.c
[CVE-2009-0029] System call wrappers part 05
2009-01-14 14:15:20 +01:00
printk.c
PM: Fix suspend_console and resume_console to use only one semaphore
2009-02-21 14:17:18 -08:00
profile.c
profiling: fix broken profiling regression
2009-02-10 00:50:37 +01:00
ptrace.c
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
rcuclassic.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcupdate.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcupreempt_trace.c
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
rcupreempt.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcutorture.c
rcu: fix bug in rcutorture system-shutdown code
2009-01-07 23:36:25 +01:00
rcutree_trace.c
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
rcutree.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
relay.c
relay: fix lock imbalance in relay_late_setup_files
2009-01-18 20:29:35 +01:00
res_counter.c
memcg: memory cgroup resource counters for hierarchy
2009-01-08 08:31:05 -08:00
resource.c
resources: fix parameter name and kernel-doc
2009-01-15 16:39:38 -08:00
rtmutex_common.h
…
rtmutex-debug.c
…
rtmutex-debug.h
…
rtmutex-tester.c
…
rtmutex.c
hrtimer: convert kernel/* to the new hrtimer apis
2008-09-05 21:35:13 -07:00
rtmutex.h
…
rwsem.c
…
sched_clock.c
sched_clock: prevent scd->clock from moving backwards, take #2
2008-12-31 09:53:21 +01:00
sched_cpupri.c
sched: fix section mismatch
2009-01-06 11:07:15 +01:00
sched_cpupri.h
sched: convert struct cpupri_vec cpumask_var_t.
2008-11-24 17:52:22 +01:00
sched_debug.c
sched: partly revert "sched debug: remove NULL checking in print_cfs_rt_rq()"
2009-01-11 02:40:32 +01:00
sched_fair.c
sched: revert recent sync wakeup changes
2009-02-11 14:43:35 +01:00
sched_features.h
sched: backward looking buddy
2008-11-05 10:30:14 +01:00
sched_idletask.c
sched: add CONFIG_SMP consistency
2008-10-22 10:01:52 +02:00
sched_rt.c
sched_rt: don't use first_cpu on cpumask created with cpumask_and
2009-02-01 10:49:52 +01:00
sched_stats.h
timers: split process wide cpu clocks/timers
2009-02-05 13:04:33 +01:00
sched.c
cpuacct: reduce one NULL check in fast-path
2009-03-13 04:54:58 +01:00
seccomp.c
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
semaphore.c
semaphore: __down_common: use signal_pending_state()
2008-08-05 14:33:47 -07:00
signal.c
signal: re-add dead task accumulation stats.
2009-02-05 13:04:33 +01:00
smp.c
generic-ipi: use per cpu data for single cpu ipi calls
2009-01-30 18:31:08 +01:00
softirq.c
Merge branch 'linus' into core/percpu
2009-03-11 10:29:28 +01:00
softlockup.c
softlock: fix false panic which can occur if softlockup_thresh is reduced
2009-01-14 11:48:07 +01:00
spinlock.c
lockdep: spin_lock_nest_lock(), checkpatch fixes
2008-08-13 13:56:51 +02:00
srcu.c
…
stacktrace.c
stacktrace: provide save_stack_trace_tsk() weak alias
2008-12-25 11:44:43 +01:00
stop_machine.c
alloc_percpu: change percpu_ptr to per_cpu_ptr
2009-02-20 16:29:08 +09:00
sys_ni.c
[CVE-2009-0029] Make sys_syslog a conditional system call
2009-01-14 14:15:16 +01:00
sys.c
sched: don't allow setuid to succeed if the user does not have rt bandwidth
2009-02-27 11:11:53 +01:00
sysctl_check.c
[XFS] remove restricted chown parameter from xfs linux
2008-10-30 18:30:09 +11:00
sysctl.c
mm: fix dirty_bytes/dirty_background_bytes sysctls on 64bit arches
2009-02-11 14:25:35 -08:00
taskstats.c
cpumask: convert rest of files in kernel/
2009-01-01 10:12:28 +10:30
test_kprobes.c
kprobes: add tests for register_kprobes
2009-01-06 15:59:20 -08:00
time.c
[CVE-2009-0029] System call wrappers part 01
2009-01-14 14:15:18 +01:00
timeconst.pl
…
timer.c
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
tracepoint.c
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
tsacct.c
Fix fixpoint divide exception in acct_update_integrals
2009-03-09 08:13:35 -07:00
uid16.c
[CVE-2009-0029] System call wrappers part 19
2009-01-14 14:15:26 +01:00
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.c
kernel/user.c: fix a memory leak when freeing up non-init usernamespaces users
2009-03-10 15:55:11 -07:00
utsname_sysctl.c
sysctl: simplify ->strategy
2008-10-16 11:21:47 -07:00
utsname.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
wait.c
wait: prevent exclusive waiter starvation
2009-02-05 12:56:48 -08:00
workqueue.c
work_on_cpu: Use our own workqueue.
2009-01-19 22:36:07 +01:00