diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index c80d0058efd1..3eee5f84f8a7 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -2145,7 +2145,10 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 
 static void xen_enter_lazy_mmu(void)
 {
-	enter_lazy(XEN_LAZY_MMU);
+	preempt_disable();
+	if (xen_get_lazy_mode() != XEN_LAZY_MMU)
+		enter_lazy(XEN_LAZY_MMU);
+	preempt_enable();
 }
 
 static void xen_flush_lazy_mmu(void)
@@ -2182,7 +2185,8 @@ static void xen_leave_lazy_mmu(void)
 {
 	preempt_disable();
 	xen_mc_flush();
-	leave_lazy(XEN_LAZY_MMU);
+	if (xen_get_lazy_mode() != XEN_LAZY_NONE)
+		leave_lazy(XEN_LAZY_MMU);
 	preempt_enable();
 }
 
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index bb95a05259b8..41251d4cf953 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -655,7 +655,7 @@ static void __init xen_e820_swap_entry_with_ram(struct e820_entry *swap_entry)
 			/* Fill new entry (keep size and page offset). */
 			entry->type = swap_entry->type;
 			entry->addr = entry_end - swap_size +
-				      swap_addr - swap_entry->addr;
+				      swap_entry->addr - swap_addr;
 			entry->size = swap_entry->size;
 
 			/* Convert old entry to RAM, align to pages. */
diff --git a/include/xen/arm/interface.h b/include/xen/arm/interface.h
index c3eada2642aa..61360b89da40 100644
--- a/include/xen/arm/interface.h
+++ b/include/xen/arm/interface.h
@@ -30,7 +30,7 @@
 
 #define __HYPERVISOR_platform_op_raw __HYPERVISOR_platform_op
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /* Explicitly size integers that represent pfns in the interface with
  * Xen so that we can have one ABI that works for 32 and 64 bit guests.
  * Note that this means that the xen_pfn_t type may be capable of