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Major rewrite of drivers/char, drivers/block, drivers/net Makefiles to compile as many C source files as possible per platform, rather than basing the compile itself based on .config file settings. For instance, all NIC drivers are now compiled, whether they're configured for use or not.
The compiled objects will then be linked into the kernel usually based on the specifically-configured driver init function call, which pulls in the object file.
Hopefully this will prevent some observed "bit-rot" where driver files were not being compiled often, thus possibly not keeping up with other changes within the kernel.
Various other cleanups. Removes a few obsolete config options and driver files.
Tested by building the kernel for all platforms, but could still result in kernel link failures when some options are configured. These will be able to be easily fixed if seen.