"Linkage" section in unclear in documentation

[AlexeySachkov]

Hi folks,

I've been reading through GenXLangRef.rst and I find Linkage section to be quite confusing:

A kernel is represented by a function with dllexport linkage.

There is no such linkage type in LLVM IR. There is a DLL storage class with such name, but that's not a linkage type.

A non-kernel function is represented by a function with public linkage.

Could you please clarify what is a public linkage? The only occurrence of word "public" in LangRef is within "Publications" link in right menu under "Additional Links".