From Fedora Project Wiki
Use of inline system calls
If an object calls Linux system calls directly, it is not visible from its ELF symbols. For a quick check whether a binary is compatible with a certain kernel version, knowing which system calls are used could be useful.
Markup for a minimal kernel version required by a binary does not work for this because new system calls are often backported. Some container environments also provide misleading version information, without implementing all the system calls.