__KERNEL__ and __MODULE__

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Hi,

I find a lot of code buried within #ifdefs for the following variables:

MODULE / __MODULE__
KERNEL / __KERNEL__

1) AFAIK, the MODULE / __MODULE__ is defined when my drievr is
selected to be compiled as a module, and the KERNEL / __KERNEL__ is
defined when is is selected to be built in the kernel image. Is this
right?

2) Why two variants ? KERNEL V/s __KERNEL__ and MODULE v/s __MODULE__?

3) Do I need to define these symbols in my Makefile myself or the
Kernel Makefiles / Kbuild does it for me?

Thanks,

Dan
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