diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 3ba1f1a..ba42d41 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -752,3 +752,4 @@ __SYSCALL(__NR_syncfs, sys_syncfs)
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_COMPAT_SYS_SENDFILE
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 38cf853..6538928 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -583,6 +583,7 @@ work_pending:
 	mov	x0, sp				// 'regs'
 	tst	x2, #PSR_MODE_MASK		// user mode regs?
 	b.ne	no_work_pending			// returning to kernel
+	enable_irq				// enable interrupts for do_notify_resume()
 	bl	do_notify_resume
 	b	ret_to_user
 work_resched:
diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c
index 967e92f..93f10e2 100644
--- a/arch/arm64/kernel/sys_compat.c
+++ b/arch/arm64/kernel/sys_compat.c
@@ -84,26 +84,6 @@ asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
 	return ret;
 }
 
-asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
-				   compat_off_t __user *offset, s32 count)
-{
-	mm_segment_t old_fs = get_fs();
-	int ret;
-	off_t of;
-
-	if (offset && get_user(of, offset))
-		return -EFAULT;
-
-	set_fs(KERNEL_DS);
-	ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
-			   count);
-	set_fs(old_fs);
-
-	if (offset && put_user(of, offset))
-		return -EFAULT;
-	return ret;
-}
-
 static inline void
 do_compat_cache_op(unsigned long start, unsigned long end, int flags)
 {
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 5eb2444..4bd7579 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -61,12 +61,10 @@ static struct dma_map_ops arm64_swiotlb_dma_ops = {
 	.mapping_error = swiotlb_dma_mapping_error,
 };
 
-void __init swiotlb_init_with_default_size(size_t default_size, int verbose);
-
-void __init arm64_swiotlb_init(size_t max_size)
+void __init arm64_swiotlb_init(void)
 {
 	dma_ops = &arm64_swiotlb_dma_ops;
-	swiotlb_init_with_default_size(min((size_t)SZ_64M, max_size), 1);
+	swiotlb_init(1);
 }
 
 #define PREALLOC_DMA_DEBUG_ENTRIES	4096
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 5f719ba..efbf7df 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -301,10 +301,7 @@ void __init mem_init(void)
 	unsigned long reserved_pages, free_pages;
 	struct memblock_region *reg;
 
-#if CONFIG_SWIOTLB
-	extern void __init arm64_swiotlb_init(size_t max_size);
-	arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1));
-#endif
+	arm64_swiotlb_init();
 
 	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 
diff --git a/arch/arm64/mm/mm.h b/arch/arm64/mm/mm.h
index d8d6e78..916701e 100644
--- a/arch/arm64/mm/mm.h
+++ b/arch/arm64/mm/mm.h
@@ -1,2 +1,3 @@
 extern void __flush_dcache_page(struct page *page);
 extern void __init bootmem_init(void);
+extern void __init arm64_swiotlb_init(void);