From mboxrd@z Thu Jan 1 00:00:00 1970 From: zlim.lnx@gmail.com (Zi Shen Lim) Date: Mon, 6 Jun 2016 22:22:58 -0700 Subject: [PATCH net-next v2 3/4] arm64: bpf: optimize JMP_CALL In-Reply-To: <1465276979-10147-1-git-send-email-zlim.lnx@gmail.com> References: <1465276979-10147-1-git-send-email-zlim.lnx@gmail.com> Message-ID: <1465276979-10147-4-git-send-email-zlim.lnx@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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