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kernel: enable CONFIG_BPF_JIT by default
Enable the built-in BPF JIT compiler for all 4.9, 4.14 and 4.19 kernels, which should speed up cBPF and eBPF-based packet filtering (tc, iptables) and packet sniffing (libpcap, tcpdump, fwknopd, etc). This has minimal kernel size impact, increasing the size of uImage-lzma (normally ~2 MB on mips_24kc or mips64el_mips64) by 5 KB for the MIPS32 arch cBPF JIT and by 9 KB for the MIPS64 arch eBPF JIT, on kernel 4.14. With JIT enabled (cBPF only), the standard BPF test module (test_bpf.ko) running on a DIR-835 (mips_24kc) used 33 CPU seconds, but 68 without JIT. This change aligns with the notion of OpenWRT as the network go-to swiss army knife for packet handling, especially on CPU-constrained platforms. Signed-off-by: Tony Ambardar <email@example.com>
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