diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h
index 263fbddcd0a382a05b384c18d2916ecfd530dae4..ea2f3f39174d9c5ab1462ed726f55b8e0a6425f5 100644
--- a/arch/csky/include/asm/highmem.h
+++ b/arch/csky/include/asm/highmem.h
@@ -33,7 +33,6 @@ extern pte_t *pkmap_page_table;
 #define ARCH_HAS_KMAP_FLUSH_TLB
 extern void kmap_flush_tlb(unsigned long addr);
 extern void *kmap_atomic_pfn(unsigned long pfn);
-extern struct page *kmap_atomic_to_page(void *ptr);
 
 #define flush_cache_kmaps() do {} while (0)
 
diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c
index 3ae5c8cd761943a15d3346bdade2c05ce65e8a32..3b3f622f5ae9569aee6d141c4a54986bc5adf736 100644
--- a/arch/csky/mm/highmem.c
+++ b/arch/csky/mm/highmem.c
@@ -81,19 +81,6 @@ void *kmap_atomic_pfn(unsigned long pfn)
 	return (void *) vaddr;
 }
 
-struct page *kmap_atomic_to_page(void *ptr)
-{
-	unsigned long idx, vaddr = (unsigned long)ptr;
-	pte_t *pte;
-
-	if (vaddr < FIXADDR_START)
-		return virt_to_page(ptr);
-
-	idx = virt_to_fix(vaddr);
-	pte = kmap_pte - (idx - FIX_KMAP_BEGIN);
-	return pte_page(*pte);
-}
-
 static void __init kmap_pages_init(void)
 {
 	unsigned long vaddr;
diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h
index 4d21308549c90bf841433e157d2819f957ce5bad..a48a6536d41a6eeb69b970292a80a44072978572 100644
--- a/arch/nds32/include/asm/highmem.h
+++ b/arch/nds32/include/asm/highmem.h
@@ -52,7 +52,6 @@ extern void kmap_init(void);
  */
 #ifdef CONFIG_HIGHMEM
 extern void *kmap_atomic_pfn(unsigned long pfn);
-extern struct page *kmap_atomic_to_page(void *ptr);
 #endif
 
 #endif