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bpf, arm64: Remove redundant switch case about BPF_DIV and BPF_MOD

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After commit 96a71005bd ("bpf, arm64: remove obsolete exception handling
from div/mod"), there is no need to check twice about BPF_DIV and BPF_MOD,
remove the redundant switch case.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/1621328170-17583-1-git-send-email-yangtiezhu@loongson.cn
This commit is contained in:
Tiezhu Yang 2021-05-18 16:56:10 +08:00 committed by Daniel Borkmann
parent f18ba26da8
commit 119220d812
1 changed files with 4 additions and 9 deletions
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13
arch/arm64/net/bpf_jit_comp.c
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@ -485,17 +485,12 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
break;
case BPF_ALU | BPF_DIV | BPF_X:
case BPF_ALU64 | BPF_DIV | BPF_X:
emit(A64_UDIV(is64, dst, dst, src), ctx);
break;
case BPF_ALU | BPF_MOD | BPF_X:
case BPF_ALU64 | BPF_MOD | BPF_X:
switch (BPF_OP(code)) {
case BPF_DIV:
emit(A64_UDIV(is64, dst, dst, src), ctx);
break;
case BPF_MOD:
emit(A64_UDIV(is64, tmp, dst, src), ctx);
emit(A64_MSUB(is64, dst, dst, tmp, src), ctx);
break;
}
emit(A64_UDIV(is64, tmp, dst, src), ctx);
emit(A64_MSUB(is64, dst, dst, tmp, src), ctx);
break;
case BPF_ALU | BPF_LSH | BPF_X:
case BPF_ALU64 | BPF_LSH | BPF_X: