From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zi Shen Lim Subject: [PATCH net-next 2/3] arm64: bpf: optimize JMP_CALL Date: Sat, 4 Jun 2016 15:00:29 -0700 Message-ID: <1465077630-633-2-git-send-email-zlim.lnx@gmail.com> References: <1465077630-633-1-git-send-email-zlim.lnx@gmail.com> Cc: Zi Shen Lim , Yang Shi , Alexei Starovoitov , Daniel Borkmann , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org To: "David S. Miller" , Catalin Marinas , Will Deacon Return-path: In-Reply-To: <1465077630-633-1-git-send-email-zlim.lnx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Remove superfluous stack frame, saving us 3 instructions for every JMP_CALL. Signed-off-by: Zi Shen Lim --- 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