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PortA interrupt busy?

A call to request_irq(11....  is returning -EBUSY and when I look at the /proc/interrupts its standing
11:            0 +  gpio PA
1. What does the + sign in the /proc/interrupts list mean?
2. What could be the reason its busy?
Kernel: 2.4.19
Etrax: MCM
Board: Custom
Terje Pedersen
Jakob Hatteland Computer