[PATCH v4 5/7] LoongArch: BPF: Adjust the jump offset of tail calls
From: Chenghao Duan <hidden>
Date: 2025-12-17 06:14:57
Also in:
bpf, lkml, loongarch
Subsystem:
bpf jit for loongarch, bpf [general] (safe dynamic programs and tools), loongarch, the rest · Maintainers:
Tiezhu Yang, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Huacai Chen, Linus Torvalds
Call the next bpf prog and skip the first instruction of TCC initialization. A total of 7 instructions are skipped: 'move t0, ra' 1 inst 'move_imm + jirl' 5 inst 'addid REG_TCC, zero, 0' 1 inst Relevant test cases: the tailcalls test item in selftests/bpf Signed-off-by: Chenghao Duan <redacted> --- arch/loongarch/net/bpf_jit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index c560d1e14b9d..3dbabacc8856 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c@@ -239,7 +239,7 @@ static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call) * Call the next bpf prog and skip the first instruction * of TCC initialization. */ - emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T3, 6); + emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T3, 7); } }
--
2.25.1