Re: How does __setup() work?

[Chris Wright <chris@wirex.com>]

* David Wuertele (dave-gnus@bfnet.com) wrote:
> 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()?

take a look at the source (include/linux/init.h).  it places code in a
special section, then is used during init/main.c::checksetup() to find
matching setup strings from the kernel boot commandline.  it's not going
to be called if you don't have an "idex=xxx" or "hdx=" string on the
commandline.  it's also called if you compile ide modular and give it
options during insmod.

cheers,
-chris
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