what is "nested irq disables"?

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Hi Everybody,
                        what is "nested irq disables" in irq.h? In
interrupt enable handler it checks for the depth of an interrupt(what
is that?). Can anybody help?


Apart from these, I am wondering what are the different fields in
/proc/meminfo. A sample output is:

# > cat /proc/interrupts
           CPU0
  2:       1270            MIPS  serial
  3:        747            MIPS  eth0
  4:          0            MIPS  linux-kernel-bde
  7:     332894            MIPS  timer


What does the 2nd coloumn indicate?


Thanks,
Sudip


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