--- zzzz-none-000/linux-4.4.271/mm/dmapool.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/mm/dmapool.c	2023-04-19 10:22:30.000000000 +0000
@@ -42,17 +42,6 @@
 #define DMAPOOL_DEBUG 1
 #endif
 
-struct dma_pool {		/* the pool */
-	struct list_head page_list;
-	spinlock_t lock;
-	size_t size;
-	struct device *dev;
-	size_t allocation;
-	size_t boundary;
-	char name[32];
-	struct list_head pools;
-};
-
 struct dma_page {		/* cacheable header for 'allocation' bytes */
 	struct list_head page_list;
 	void *vaddr;