bpf: Pull out a macro for interpreting atomic ALU operations
Since the atomic operations that are added in subsequent commits are all isomorphic with BPF_ADD, pull out a macro to avoid the interpreter becoming dominated by lines of atomic-related code. Note that this sacrificies interpreter performance (combining STX_ATOMIC_W and STX_ATOMIC_DW into single switch case means that we need an extra conditional branch to differentiate them) in favour of compact and (relatively!) simple C code. Signed-off-by: NBrendan Jackman <jackmanb@google.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Acked-by: NYonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210114181751.768687-9-jackmanb@google.com
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