Answer / 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.

Answer / rulingminds

kernel object(.ko) is a relocatable elf object which
contains module code and data in elf sections. module.c is
compiled into relocatable object and intermediate file
module.mod.c is compiled into relocatable object and they
both together make into one relocatable file called kernel
object (.ko)

see www.rulingminds.com/modprogpart2

for in depth explanation of how modules are built and what
they contain and how they are inserted and removed

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