How to understand the macro __init?

[stl]

To be more precise, all the content of the .init section will be freed at
the end of the boot. (see vmlinux.lds.S)
This is done by the function "free_initmem()" which is an architecture
specific function defined in linux-*/arch/<arch>/mm/init.c.

This function frees the memory between the symbols __init_begin and
__init_end (which need to be page-aligned).

During compilation, all symbols defined with __init macro are put in the
.init section.
As explained before, these a
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