[PATCH] PA-RISC irq handling improvements

 - Move the bits_wide parameter from txn_alloc_data to txn_alloc_irq.
   It's too late by the time it hits txn_alloc_data(), we can only panic.
   In txn_alloc_irq, we can fail the allocation and continue.
 - Also fix a bug where we'd only allow up to half the interrupts to be
   allocated.  Not a problem for iosapic machines, but might have sucked
   on a really big GSC-based machine.
 - Add missing irq_enter() / irq_exit()
 - Allow interrupt processing to be interrupted by the timer tick so we
   actually account hard interrupts.  Also speed up the handling of CPU
   interrupts by not masking with cpu_eiem again.
 - Remove sufficiently obsolete DEBUG_IRQ code
 - Remove limit on times around the loop.  If we exit the loop while
   interrupts are still pending, we'll only be re-interrupted as soon
   as we exit the function.
 - Remove unnecessary includes

Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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