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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 51abc97..7ae304e 100644 (file)
--- 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 */