Messages in this thread |  | | From | "Hammond, Jean-François" <> | Subject | Re: [BUG] Scheduling in interrup | Date | Tue, 4 Sep 2001 17:20:52 -0400 |
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Hi,
>o Are you attempting to access paged RAM?
I am using kmalloc to reserve my memory. kmalloc as the options GFP_KERNEL and GFP_DMA. I am not using any command to reserve memory in the interrupt handler.
>o Are you accessing anything that sleeps?
Not in the interrupt handler.
>o Are you enabling interrupts without protecting against re-entry first?
I am not sure what do you mean, but I am attaching the interrupt handler with the function request_irq with the option SA_INTERRUPT & SA_SHIRQ. Does the kernel prevent re-entry of the interrupt handler ?
I look in the function schedule :
asmlinkage void schedule(void) { struct schedule_data * sched_data; struct task_struct *prev, *next, *p; struct list_head *tmp; int this_cpu, c;
if (!current->active_mm) BUG(); need_resched_back: prev = current; this_cpu = prev->processor;
if (in_interrupt()) goto scheduling_in_interrupt;
<...>
scheduling_in_interrupt: printk("Scheduling in interrupt\n"); BUG(); <--------------------------------This is the line 706. --> This is my problem <-- return; }
Do you have any idea how this could happen ?
Thanks,
Jean-François Hammond .
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