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Date: Wed, 8 Jun 2016 21:18:49 -0700 From: Zi Shen Lim <zlim.lnx@...il.com> To: "David S. Miller" <davem@...emloft.net>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com> Cc: Zi Shen Lim <zlim.lnx@...il.com>, Yang Shi <yang.shi@...aro.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: [PATCH net-next v3 3/4] arm64: bpf: optimize JMP_CALL Remove superfluous stack frame, saving us 3 instructions for every JMP_CALL. Signed-off-by: Zi Shen Lim <zlim.lnx@...il.com> --- arch/arm64/net/bpf_jit_comp.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 51abc97..7ae304e 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -578,11 +578,8 @@ emit_cond_jmp: const u64 func = (u64)__bpf_call_base + imm; emit_a64_mov_i64(tmp, func, ctx); - emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx); - emit(A64_MOV(1, A64_FP, A64_SP), ctx); emit(A64_BLR(tmp), ctx); emit(A64_MOV(1, r0, A64_R(0)), ctx); - emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx); break; } /* tail call */ -- 1.9.1
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