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How does __setup() work?

I'm trying to track down why ide_setup() doesn't seem to be called on
my system.  I'm using KGDB to put breakpoints in ide_setup(), but they
never get hit.  I see that ide_setup is defined as:

int __init ide_setup (char *s)
{
...

and there is also a line:

__setup("", ide_setup);

What do these macros do?  How can I get KGDB to break in ide_setup()?

Thanks,
Dave

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