[PATCH] Debug shared irqs

[PATCH] Debug shared irqs

Drivers registering IRQ handlers with SA_SHIRQ really ought to be able to
handle an interrupt happening before request_irq() returns.  They also
ought to be able to handle an interrupt happening during the start of their
call to free_irq().  Let's test that hypothesis....

[[email protected]: Kconfig fixes]
Signed-off-by: David Woodhouse <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Signed-off-by: Jesper Juhl <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>