diff -up ./arch/x86/kernel/vm86_32.c.tlb ./arch/x86/kernel/vm86_32.c

--- ./arch/x86/kernel/vm86_32.c.tlb	2018-03-22 06:40:12.000000000 +0900

+++ ./arch/x86/kernel/vm86_32.c	2018-04-15 22:46:42.000000000 +0900

@@ -194,7 +194,7 @@ static void mark_screen_rdonly(struct mm

 	pte_unmap_unlock(pte, ptl);

 out:

 	up_write(&mm->mmap_sem);

-	flush_tlb();

+	flush_tlb_mm_range(mm, 0xA0000, 0xA0000 + 32*PAGE_SIZE, 0UL);

 }