Most ARCHs support SPARSE_IRQ, the dynamical and statical irq
description allocation are alternative.

The last user of MAY_HAVE_SPARSE_IRQ is sh/csky, but the sh use
SPARSE_IRQ, MAY_HAVE_SPARSE_IRQ could be kill. and for csky, it
uses statical allocation by default. 

So MAY_HAVE_SPARSE_IRQ seems to be useless, no need to maintain a
separate MAY_HAVE_SPARSE_IRQ config, kill it.

Also cleanup the kernel/irq/Kconfig a little.

v2: 
- drop all the NR_IRQS suggested by Geert
- don' use SPARSE_IRQ for csky by default, suggested by Guo.

Kefeng Wang (3):
  sh: Cleanup about SPARSE_IRQ
  csky: Kill MAY_HAVE_SPARSE_IRQ
  genirq: Cleanup Kconfig

 arch/csky/Kconfig         |  1 -
 arch/sh/Kconfig           |  1 -
 arch/sh/include/asm/irq.h | 11 ---------
 kernel/irq/Kconfig        | 50 ++++++++++++++++-----------------------
 4 files changed, 20 insertions(+), 43 deletions(-)

-- 
2.26.2