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Why do some function calls in kernel specially have this prefix __

example: __init initialization(void)

is __init a macro?

What does this convey? Are these a special class of function calls inside the kernel or do they resemble any assembly function body present inside? What actually are they trying to represent?

  • This has been answered at the Stack Overflow site here – Warwick Aug 5 '14 at 4:20
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As mentioned by Code_cynic, the double underscore means that is is reserved (the same for keywords with one underscore followed by a capital letter): https://stackoverflow.com/a/10687114/2915175

The explanation of the __init macro can be found here and it expands to a __attribute__: https://stackoverflow.com/a/8832166/2915175

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It means it's a system-reserved name.that means it is reserve for implementation.

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