bpf, x86: Propagate tailcall info only for subprogs

In x64 JIT, propagate tailcall info only for subprogs, not for helpers
or kfuncs.

Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20241107134529.8602-2-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 8f896c3..a43fc5a 100644 (file)
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -2186,7 +2186,7 @@ populate_extable:
                        u8 *ip = image + addrs[i - 1];
 
                        func = (u8 *) __bpf_call_base + imm32;
-                       if (tail_call_reachable) {
+                       if (src_reg == BPF_PSEUDO_CALL && tail_call_reachable) {
                                LOAD_TAIL_CALL_CNT_PTR(stack_depth);
                                ip += 7;
                        }