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[bpf,0/2] bpf, arm: Small JIT optimizations

Message ID 20200501020210.32294-1-luke.r.nels@gmail.com
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Series bpf, arm: Small JIT optimizations | expand

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Luke Nelson May 1, 2020, 2:02 a.m. UTC 
As Daniel suggested to us, we ran our formal verification tool, Serval,
over the arm JIT. The bugs we found have been patched and applied to the
bpf tree [1, 2]. This patch series introduces two small optimizations
that simplify the JIT and use fewer instructions.

[1] https://lore.kernel.org/bpf/20200408181229.10909-1-luke.r.nels@gmail.com/
[2] https://lore.kernel.org/bpf/20200409221752.28448-1-luke.r.nels@gmail.com/

Luke Nelson (2):
  bpf, arm: Optimize emit_a32_arsh_r64 using conditional instruction
  bpf, arm: Optimize ALU ARSH K using asr immediate instruction

 arch/arm/net/bpf_jit_32.c | 14 +++++++++-----
 arch/arm/net/bpf_jit_32.h |  2 ++
 2 files changed, 11 insertions(+), 5 deletions(-)