Dmitry Adamushko wrote: > Hello Jan, > > as I promised earlier today, here is the patch.
I finally had a look at your patch (not yet a try), and it looks really nice and light-weight. Now I only have two topics on my wish list: o Handling of edge-triggered IRQs (ISA-cards...). As I tried to explain, in this case we have to run the IRQ handler list as long as the full list completed without any handler reporting XN_ISR_ENABLE back. Then and only then we are safe to not stall the IRQ line. See e.g. serial8250_interrupt() in linux/drivers/serial/8250.c for a per-driver solution and  for some discussion on sharing IRQs (be warned, it's from the evil side ;) ). On our systems we already have two of those use-cases: the xeno_16550A handling up to 4 devices on the same IRQ on an ISA card (I don't want to know what worst-case latency can be caused here...) and our SJA-1000 CAN driver for PC/104 ISA card with 2 controllers on the same interrupt line. So a common solution would reduce the code size and potential bug sources. o Store and display (/proc) the driver name(s) registered on an IRQ line somewhere (ipipe?). This is just a nice-to-have. I introduced the RTDM API with the required argument in place, would be great if we can use this some day. BTW, making the RTDM API shirq-aware should be as easy as adding some flags: one for sharing in general and maybe another one for marking edge-triggered IRQs. Jan PS: Still at home? How many degrees Centigrade? I guess our current -9°C here in Hannover must appear ridiculous, almost subtropical warm to you. ;)  http://www.microsoft.com/whdc/system/sysperf/apic.mspx
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