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SubjectRe: Is it possible to implement interrupt time printk's reliably?
Jon Smirl <jonsmirl@yahoo.com> wrote:
>
> Problem:
> 1) Some operations on graphics cards cannot be stopped once they are started.
> It's not reasonable to turn interrupts off around these operations.
> 2) Kernel developers want console printk's to work from interrupt routines.
>
> How do you fix this situation?

Really you should use spin_lock_irqsave() on some driver-private lock
around the operation. Why is it not reasonable to disable irq's?
Duration, presumably?

If you're in process context you can use acquire_console_sem(), which will
serialise against printk.

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