[v1 PATCH 0/4] Add INT mode support for EDAC drivers on Maple

[Harry Ciao]

Hi Ben,

This is the v2 patches that have integrated your suggestions to
remove the refcount for a hwriq2virq mapping as long as we don't
dispose it, the changes are mostly within the 1/4 patch where the
unnecessary refcount and irqmap structure are removed, and callings
to edac_put_mpic_irq() are also removed from the rest of patches.

Since there are 3 EDAC modules on Maple will use one same copy of
code to create hwirq2virq mappings, I perfer to preserve it in
edac_mpic_irq.c.

How do feel about the assumption that MPIC will latch INT 0 pin for 
the NMI Reqeust Messages whose vector is == 0? This is the thing that
I have least confidence in, so far all I can get is the brief
introduction in CPC925 user manual that "This interrupt vector is used
to set a corresponding interrupt latch", P111, so I think it imples that
vector==0 will latch pin #0.

Many thanks for all your comments!

Best regards,

Harry
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