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Hi,

I am trying to get variadic functions working in my kernel. This constitutes an implementation of stdarg.h, yes? Am I going about that the right way?

Thanks,

If you use gcc cross compiler, you may just #include <stdarg.h>, the compiler handle the dirty work for you.
You should not implement va_ macro/function yourself, it is just not necessary and not portable.

By the way, it is generally not a good idea to use variadic functions in kernel, except for debug purpose (aka. kprintf)