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The bswap64 function has the argument with incorrect type at kernel/src/arch/x86/x64/byteorder.h. This argument should have the u64_t type instead of the u32_t type.
It looks like byteorder.h is not included anywhere. Do you need those functions for anything in particular? If not, I'll just remove the file.
I just browsed this code. You don't have to remove this file. You can change type of argument of bswap64 (change u32_t to u64_t).
I realize I can change the argument of bswap64 to fix the bug you reported. But if that function is not used anywhere, there is no point in dragging along dead code.
Remove dead code (closes #9)