Answer Posted / ajay gautam

kernel 2.6 introduces a new file naming convention: kernel
modules now have a .ko extension (in place of the old .o
extension) which easily distinguishes them from conventional
object files. The reason for this is that they contain an
additional .modinfo section that where additional
information about the module is kept.
Linux program modpost can be used to convert .o files into
.ko files.

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