nommu: use flush_icache_user_range in brk and mmap

These obviously operate on user addresses.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/20200515143646.3857579-29-hch@lst.deSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/nommu.c

@@ -433,7 +433,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 	/*
 	 * Ok, looks good - let it rip.
 	 */
-	flush_icache_range(mm->brk, brk);
+	flush_icache_user_range(mm->brk, brk);
 	return mm->brk = brk;
 }
 
@@ -1277,7 +1277,7 @@ unsigned long do_mmap(struct file *file,
 	/* we flush the region from the icache only when the first executable
 	 * mapping of it is made  */
 	if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) {
-		flush_icache_range(region->vm_start, region->vm_end);
+		flush_icache_user_range(region->vm_start, region->vm_end);
 		region->vm_icache_flushed = true;
 	}