The Linux kernel macros

The Linux kernel macros

Posted May 24, 2006 16:29 UTC (Wed) by pflugstad (subscriber, #224)
In reply to: The Linux kernel is unambiguously licensed under GPL version 2.0. by kakareka
Parent article: Kororaa and the GPL - Update 1

Heh - have you seen the min/max macros the kernel uses? Here's the debate (the first 1/2 a dozen entries or so):

<http://www.google.com/search?q=min+max+macro+site%3Alwn.n...>

And the current form (as of 2.6.16.18), which do type checking:

<http://lxr.linux.no/source/include/linux/kernel.h>

Also, I think a lot of the time, the kernel uses inline functions, and they are frequenly non-trivial. I think a lot of the scheduling and locking (spinlocks, sems, etc) functions are actually inline functions. Basically, a LOT of functionality is incorporated in in kernel headers.

So it get really hard to interact with the kernel without including kernel headers and using these inline functions - and from there, you get to a derived work pretty quickly.

Pete

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