Thomas Gleixner eaad084bb0 NOHZ: prevent multiplication overflow - stop timer for huge timeouts ...

get_next_timer_interrupt() returns a delta of (LONG_MAX > 1) in case
there is no timer pending. On 64 bit machines this results in a
multiplication overflow in tick_nohz_stop_sched_tick().

Reported by: Dave Miller <[email protected]>

Make the return value a constant and limit the return value to a 32 bit
value.

When the max timeout value is returned, we can safely stop the tick
timer device. The max jiffies delta results in a 12 days timeout for
HZ=1000.

In the long term the get_next_timer_interrupt() code needs to be
reworked to return ktime instead of jiffies, but we have to wait until
the last users of the original NO_IDLE_HZ code are converted.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-off-by: David S. Miller <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2007-05-29 18:11:10 -07:00

..

irq

Fix crash with irqpoll due to the IRQF_IRQPOLL flag testing

2007-05-24 08:37:14 -07:00

power

power: Fix sizeof(PAGE_SIZE) typo

2007-05-23 20:14:14 -07:00

time

NOHZ: prevent multiplication overflow - stop timer for huge timeouts

2007-05-29 18:11:10 -07:00

.gitignore

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acct.c

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audit.c

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audit.h

[PATCH] audit signal recipients

2007-05-11 05:38:25 -04:00

auditfilter.c

audit_match_signal() and friends are used only if CONFIG_AUDITSYSCALL is set

2007-05-15 18:56:37 -07:00

auditsc.c

[PATCH] Abnormal End of Processes

2007-05-11 05:38:26 -04:00

capability.c

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compat.c

signal/timer/event: timerfd compat code

2007-05-11 08:29:36 -07:00

configs.c

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cpu.c

microcode: use suspend-related CPU hotplug notifications

2007-05-09 12:30:56 -07:00

cpuset.c

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delayacct.c

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die_notifier.c

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dma.c

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exec_domain.c

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exit.c

recalc_sigpending_tsk fixes

2007-05-23 20:14:12 -07:00

extable.c

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fork.c

freezer: fix vfork problem

2007-05-23 20:14:11 -07:00

futex_compat.c

futex_requeue_pi optimization

2007-05-09 12:30:55 -07:00

futex.c

FUTEX: new PRIVATE futexes

2007-05-09 12:30:55 -07:00

hrtimer.c

Add suspend-related notifications for CPU hotplug

2007-05-09 12:30:56 -07:00

itimer.c

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kallsyms.c

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Kconfig.hz

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Kconfig.preempt

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kexec.c

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kfifo.c

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kmod.c

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kprobes.c

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ksysfs.c

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kthread.c

freezer: fix kthread_create vs freezer theoretical race

2007-05-23 20:14:11 -07:00

latency.c

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lockdep_internals.h

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lockdep_proc.c

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lockdep.c

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Makefile

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module.c

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mutex-debug.c

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mutex-debug.h

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mutex.c

wrap access to thread_info

2007-05-09 12:30:56 -07:00

mutex.h

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nsproxy.c

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panic.c

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params.c

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pid.c

statically initialize struct pid for swapper

2007-05-11 08:29:35 -07:00

posix-cpu-timers.c

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posix-timers.c

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printk.c

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profile.c

Detach sched.h from mm.h

2007-05-21 09:18:19 -07:00

ptrace.c

[PATCH] auditing ptrace

2007-05-11 05:38:25 -04:00

rcupdate.c

Add suspend-related notifications for CPU hotplug

2007-05-09 12:30:56 -07:00

rcutorture.c

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relay.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial

2007-05-09 12:54:17 -07:00

resource.c

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rtmutex_common.h

futex_requeue_pi optimization

2007-05-09 12:30:55 -07:00

rtmutex-debug.c

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rtmutex-debug.h

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rtmutex-tester.c

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rtmutex.c

futex_requeue_pi optimization

2007-05-09 12:30:55 -07:00

rtmutex.h

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rwsem.c

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sched.c

Prevent going idle with softirq pending

2007-05-23 20:14:15 -07:00

seccomp.c

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signal.c

recalc_sigpending_tsk fixes

2007-05-23 20:14:12 -07:00

softirq.c

Add suspend-related notifications for CPU hotplug

2007-05-09 12:30:56 -07:00

softlockup.c

Add suspend-related notifications for CPU hotplug

2007-05-09 12:30:56 -07:00

spinlock.c

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srcu.c

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stacktrace.c

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stop_machine.c

stop_machine() now uses hard_irq_disable

2007-05-11 08:29:34 -07:00

sys_ni.c

compat signalfd and timerfd are cond syscalls

2007-05-12 10:55:40 -07:00

sys.c

attach_pid() with struct pid parameter

2007-05-11 08:29:35 -07:00

sysctl.c

make sysctl/kernel/core_pattern and fs/exec.c agree on maximum core filename size

2007-05-17 05:23:05 -07:00

taskstats.c

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time.c

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timer.c

NOHZ: prevent multiplication overflow - stop timer for huge timeouts

2007-05-29 18:11:10 -07:00

tsacct.c

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uid16.c

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user.c

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utsname_sysctl.c

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utsname.c

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wait.c

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workqueue.c

simplify cleanup_workqueue_thread()

2007-05-23 20:14:13 -07:00