Skip compile SP pass under enforce_eager (V2 runner)

sp_threshold force-enabled compilation_config.pass_config.enable_sp, which the
V2 model runner rejects ("does not yet support: sequence parallelism"). The
eager in-forward SP path reads sp_threshold directly and needs no compile pass;
under enforce_eager there is no compilation to attach it to. Guard the mapping.

Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

vllm/config/vllm.py

@@ -1206,7 +1206,11 @@ class VllmConfig:
         #   None  -> defer to the optimization-level default
         #   N > 0 -> force the pass on with N as its min-token threshold
         sp_threshold = self.parallel_config.sp_threshold
-        if sp_threshold is not None:
+        # Only enable the compile-based SP pass when compilation actually runs.
+        # The eager in-forward SP path reads sp_threshold directly and runs the
+        # V2 model runner, which rejects the compile SP pass; under enforce_eager
+        # there is no compilation to attach it to anyway.
+        if sp_threshold is not None and not self.model_config.enforce_eager:
             pass_config.enable_sp = True
             if pass_config.sp_min_token_num is None:
                 pass_config.sp_min_token_num = sp_threshold