Sharing itself is no problem: if your request an IRQ with XN_ISR_SHARED
set but the nucleus is not able to actually assign it to more than one
driver, the second request will simply fail. I see no need to deny the
first request or even break the driver build.
Problematic is only the handling of edge-triggered shared IRQs with the
level-triggered handler (can cause lost IRQs). Probably a runtime check
is best as we cannot control the configuration of, e.g., external RTDM
drivers. What about the attached patch?
It's ok with me.
I just thought maybe it's better to break a build and alert a user earlier (although, it's kind of inderect alert indeed) when the host environment (Xeno) doesn't support a requested mode (e.g. SHARED_EDGE).
If such a driver (that requires EDGE_SHARED) is a part of the mainline, then we may use Kconfig features either (1) to make it "selectable" only when XENO_OPT_SHIRQ_EDGE is on or (2) select XENO_OPT_SHIRQ_EDGE automatically when the driver has been choosen.
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