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Commit 997ce888 authored by Zi Shen Lim's avatar Zi Shen Lim Committed by David S. Miller
Browse files

arm64: bpf: optimize JMP_CALL 



Remove superfluous stack frame, saving us 3 instructions for
every JMP_CALL.

Signed-off-by: default avatarZi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ddb55992

arch/arm64/net/bpf_jit_comp.c

+0 −3
Original line number Diff line number Diff line
@@ -578,11 +578,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) 
		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 */