[MIPS] IRQ cleanups

This is a big irq cleanup patch.

* Use set_irq_chip() to register irq_chip.
* Initialize .mask, .unmask, .mask_ack field.  Functions for these
  method are already exist in most case.
* Do not initialize .startup, .shutdown, .enable, .disable fields if
  default routines provided by irq_chip_set_defaults() were suitable.
* Remove redundant irq_desc initializations.
* Remove unnecessary local_irq_save/local_irq_restore, spin_lock.

With this cleanup, it would be easy to switch to slightly lightwait
irq flow handlers (handle_level_irq(), etc.) instead of __do_IRQ().

Though whole this patch is quite large, changes in each irq_chip are
not quite simple.  Please review and test on your platform.  Thanks.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/include/asm-mips/dec/kn02.h b/include/asm-mips/dec/kn02.h
index 8319ad77b250..93430b5f4724 100644
--- a/include/asm-mips/dec/kn02.h
+++ b/include/asm-mips/dec/kn02.h
@@ -82,11 +82,9 @@
 
 #ifndef __ASSEMBLY__
 
-#include <linux/spinlock.h>
 #include <linux/types.h>
 
 extern u32 cached_kn02_csr;
-extern spinlock_t kn02_lock;
 extern void init_kn02_irqs(int base);
 #endif