From: Chenghao Duan Date: Wed, 31 Dec 2025 07:19:21 +0000 (+0800) Subject: LoongArch: BPF: Adjust the jump offset of tail calls X-Git-Tag: v6.19-rc4~11^2~3 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61319d15a56093358c6822d30659fe2941f589f1;p=thirdparty%2Flinux.git LoongArch: BPF: Adjust the jump offset of tail calls 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. Cc: stable@vger.kernel.org Fixes: 677e6123e3d2 ("LoongArch: BPF: Disable trampoline for kernel module function trace") Signed-off-by: Chenghao Duan Signed-off-by: Huacai Chen --- diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c index 9729c0ff7bfc..e6aeaec46969 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); } }