* Kevin Hilman <[EMAIL PROTECTED]> wrote:
> To produce the following trace, I wrote a simple moudle which just has
> this as its init_module routine:
>
> local_irq_disable();
> p = __get_free_page(GFP_ATOMIC);
> local_irq_enable();
in the PREEMPT_RT kernel almost everything might sleep, so the general
rule is to not call anything 'complex' from an IRQs-off section.
Depending on which is easier in your code, if you want to fix it up for
PREEMPT_RT then either move the GFP_ATOMIC allocation from under the
irqs-off section, or introduce a spinlock for the irqs-off section and
use spin_lock_irqsave(). (that is almost always needed anyway if you
really needed the irqs-off section.)
Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
