--- zzzz-none-000/linux-4.1.52/arch/arm/include/asm/cacheflush.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/arch/arm/include/asm/cacheflush.h	2022-03-02 11:37:12.000000000 +0000
@@ -167,6 +167,21 @@
 
 #endif
 
+#if defined(CONFIG_BCM_KF_NBUFF)
+#ifdef CONFIG_CPU_CACHE_V7
+#define __cpuc_flush_line(_addr)	\
+	__asm__ __volatile__("mcr p15, 0, %0, c7, c14, 1" : : "r" (_addr))
+#define __cpuc_clean_line(_addr)	\
+	__asm__ __volatile__("mcr p15, 0, %0, c7, c10, 1" : : "r" (_addr))
+#define __cpuc_inv_line(_addr)		\
+	__asm__ __volatile__("mcr p15, 0, %0, c7, c6, 1" : : "r" (_addr))
+#else
+#define __cpuc_flush_line(_addr)	do {} while(0)
+#define __cpuc_clean_line(_addr)	do {} while(0)
+#define __cpuc_inv_line(_addr)		do {} while(0)
+#endif
+#endif
+
 /*
  * Copy user data from/to a page which is mapped into a different
  * processes address space.  Really, we want to allow our "user
@@ -239,7 +254,7 @@
 }
 
 static inline void
-vivt_flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn)
+vivt_flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn __maybe_unused)
 {
 	struct mm_struct *mm = vma->vm_mm;
 
@@ -343,7 +358,7 @@
  * data, we need to do a full cache flush to ensure that writebacks
  * don't corrupt data placed into these pages via the new mappings.
  */
-static inline void flush_cache_vmap(unsigned long start, unsigned long end)
+static inline void flush_cache_vmap(unsigned long start __maybe_unused, unsigned long end __maybe_unused)
 {
 	if (!cache_is_vipt_nonaliasing())
 		flush_cache_all();
@@ -355,7 +370,7 @@
 		dsb(ishst);
 }
 
-static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
+static inline void flush_cache_vunmap(unsigned long start __maybe_unused, unsigned long end __maybe_unused)
 {
 	if (!cache_is_vipt_nonaliasing())
 		flush_cache_all();