tree aecce5f8d02c6d31a6878b5e3a6c43f774297d4c
parent d35ef90bf9e7cab9aa85e9c0724bd1ac6f784601
author Michael Ellerman <michael@ellerman.id.au> 1255463084 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1256883654 +1100

powerpc: Make NR_IRQS a CONFIG option

The irq_desc array consumes quite a lot of space, and for systems
that don't need or can't have 512 irqs it's just wasted space.

The first 16 are reserved for ISA, so the minimum of 32 is really
16 - and no one has asked for more than 512 so leave that as the
maximum.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>