From ea9d8e3f45404d411c00ae67b45cc35c58265bb7 Mon Sep 17 00:00:00 2001 From: Xiaotian Feng Date: Thu, 7 Jan 2010 11:22:44 +0800 Subject: [PATCH] clockevent: Don't remove broadcast device when cpu is dead Marc reported that the BUG_ON in clockevents_notify() triggers on his system. This happens because the kernel tries to remove an active clock event device (used for broadcasting) from the device list. The handling of devices which can be used as per cpu device and as a global broadcast device is suboptimal. The simplest solution for now (and for stable) is to check whether the device is used as global broadcast device, but this needs to be revisited. [ tglx: restored the cpuweight check and massaged the changelog ] Reported-by: Marc Dionne Tested-by: Marc Dionne Signed-off-by: Xiaotian Feng LKML-Reference: <1262834564-13033-1-git-send-email-dfeng@redhat.com> Signed-off-by: Thomas Gleixner Cc: stable@kernel.org --- kernel/time/clockevents.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 6f740d9f0948..d7395fdfb9f3 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -259,7 +259,8 @@ void clockevents_notify(unsigned long reason, void *arg) cpu = *((int *)arg); list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) { if (cpumask_test_cpu(cpu, dev->cpumask) && - cpumask_weight(dev->cpumask) == 1) { + cpumask_weight(dev->cpumask) == 1 && + !tick_is_broadcast_device(dev)) { BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED); list_del(&dev->list); } -- 2.20.1