Extern variables are understandable. But what are these extern functions? By default, functions declared in one source file are visible in another file when these two files are compiled together (this is what ANSI C says). But at many places in linux source, I see functions declared with an extern keyword. Does it carry any significance(to the compiler)? or probably it is just a mechanism to tell the user reading the file that particular function is defined in some other file, so don't waste time looking for the function definition in this file?
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