[Bug bpf/22312] bpf: global variable and statistics aggregate locking

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=22312

--- Comment #4 from Serhei Makarov <me at serhei dot io> ---
Newer kernels will include a spinlock primitive:
https://github.com/torvalds/linux/blob/master/include/uapi/linux/bpf.h#L2346

On older kernels we may either use the XADD method or just print a warning and
skip locking altogether.

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