diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h
index 63b3393bd98ea2caaa67aefeeab359cbac72dc51..c53682303c9c1252a79d90cf8dd19a96d126db93 100644
--- a/arch/x86/include/asm/realmode.h
+++ b/arch/x86/include/asm/realmode.h
@@ -77,7 +77,11 @@ static inline size_t real_mode_size_needed(void)
 	return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
 }
 
-void set_real_mode_mem(phys_addr_t mem, size_t size);
+static inline void set_real_mode_mem(phys_addr_t mem)
+{
+	real_mode_header = (struct real_mode_header *) __va(mem);
+}
+
 void reserve_real_mode(void);
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index 458a0e2bcc57ca42a10964c5b62bc8bd11ca96ea..a25a9fd987a9e5dc2ba75d7b3c91c098ad7d7034 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -449,7 +449,7 @@ void __init efi_free_boot_services(void)
 		 */
 		rm_size = real_mode_size_needed();
 		if (rm_size && (start + rm_size) < (1<<20) && size >= rm_size) {
-			set_real_mode_mem(start, rm_size);
+			set_real_mode_mem(start);
 			start += rm_size;
 			size -= rm_size;
 		}
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 47d097946872772264ddf1fe55c5d5de014e3b43..7dce39c8c034a8a9f2481aff02590a793ff86498 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -15,13 +15,6 @@ u32 *trampoline_cr4_features;
 /* Hold the pgd entry used on booting additional CPUs */
 pgd_t trampoline_pgd_entry;
 
-void __init set_real_mode_mem(phys_addr_t mem, size_t size)
-{
-	void *base = __va(mem);
-
-	real_mode_header = (struct real_mode_header *) base;
-}
-
 void __init reserve_real_mode(void)
 {
 	phys_addr_t mem;
@@ -40,7 +33,7 @@ void __init reserve_real_mode(void)
 	}
 
 	memblock_reserve(mem, size);
-	set_real_mode_mem(mem, size);
+	set_real_mode_mem(mem);
 }
 
 static void __init setup_real_mode(void)