Disable prefix caching only if chunked prefill is explicitly disabled

Signed-off-by: simondanielsson <simon.danielsson99@hotmail.com>

Author: simondanielsson

vllm/config/__init__.py

@@ -432,7 +432,9 @@ def __post_init__(self):
                         "try setting 'VLLM_WORKER_MULTIPROC_METHOD' "
                         "to 'spawn'.")
 
-        if (not self.scheduler_config.chunked_prefill_enabled
+        # Disable prefix caching only if chunked prefill is explicitly disabled
+        # (and not merely unset)
+        if (self.scheduler_config.chunked_prefill_enabled is False
                 or disable_chunked_prefill_reasons):
             for reason in disable_chunked_prefill_reasons:
                 logger.info(reason)