Messages in this thread | | | Subject | Re: 2.6.15-rc5-rt2 won't boot on dual 933 | From | Steven Rostedt <> | Date | Sun, 18 Dec 2005 19:51:13 -0500 |
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On Sun, 2005-12-18 at 15:55 -0600, K.R. Foley wrote: > dump_stack+0x1e/0x20 (20) > [<c011c9df>] preempt_enable_no_resched+0x5f/0x70 (20) > [<c0100ff2>] cpu_idle+0xb2/0x100 (40) > [<c0111446>] start_secondary+0x296/0x340<6>
Ingo,
What's the reason for this printing out in cpu_idle?
#ifdef CONFIG_DEBUG_PREEMPT void notrace preempt_enable_no_resched(void) { static int once = 1;
barrier(); dec_preempt_count();
if (once && !preempt_count()) { once = 0; printk(KERN_ERR "BUG: %s:%d task might have lost a preemption check! \n", current->comm, current->pid); dump_stack(); } }
EXPORT_SYMBOL(preempt_enable_no_resched); #endif
I can understand the above when using preempt_enable_no_resched, when you know that you still have preemption on, but sometimes (as in cpu_idle) it is used just before calling schedule. So this check is pretty much meaningless.
---
KR,
Does your kernel boot without CONFIG_DEBUG_PREEMPT?
-- Steve
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