powerpc/irq: Make irqstats array based

Current irq_cpustat_t has separate member for handling each arch
specific interrupt type. The same can be achieved with array instead
indexed by corresponding irq counter type.

This helps to,

- Make it easy to integrate into genirq improvements by calling
  genirq provided irq_proc_emit_counts. That speeds up quite a bit
  by printing all 0's once as much as possible.

- Adding a new vector or software counter only requires to update the table
  and everything just works

- Remove ifdef usage a bit.

- Instead of going through each member, it simply becomes an array
  traversal.

Time taken to read /proc/interrupts 1000 times.
Base and v6 details can be found in cover-letter.
Base		:  103us
v6		:   63us
v6+this_patch	:   57us

A Decent 10% reduction can be seen in a system 240 CPUs. As the system
size increases the gain would be more as emitting 0 would reduce more
and more.

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260921090153.54745-3-sshegde@linux.ibm.com

0 files changed, 0 insertions, 0 deletions