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xen/intr: add architecture interrupt counter initializer

Authored by on Jun 29 2021, 6:32 AM.
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Unfortunately there isn't any architecture-independent interrupt counter
access or initialization. Due to this, add yet another hook to all the
architecture to setup the counter.

Diff Detail

rS FreeBSD src repository - subversion
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Buildable 40156
Build 37045: arc lint + arc unit

Event Timeline

I'm really unsure about this. There needs to be a solution to the issue of intrcnt_add() being x86-only, but I don't know whether the implementation in D31064 is appropriate (works as a stop-gap, but...).

I expect to abandon as a better solution has shown up, I'm simply waiting for confirmation before doing so.

Abandoning as a better approach was identified and has now passed the first testing round.