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Add documentation for the BPF spinlock-related helpers to the doc in bpf.h. I added the constraints and restrictions coming with the use of spinlocks for BPF: not all of it is directly related to the use of the helper, but I thought it would be nice for users to find them in the man page. This list of restrictions is nearly a verbatim copy of the list in Alexei's commit log for those helpers. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>