ion: allow cached mappings of chunk and system heap buffers

Now that ion_vm_fault uses vm_insert_pfn instead of vm_insert_page
cached buffers can be supported in any heap.  Remove the checks
in the chunk and system heaps.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion_chunk_heap.c

@@ -47,9 +47,6 @@ static int ion_chunk_heap_allocate(struct ion_heap *heap,
 	unsigned long num_chunks;
 	unsigned long allocated_size;
 
-	if (ion_buffer_fault_user_mappings(buffer))
-		return -ENOMEM;
-
 	allocated_size = ALIGN(size, chunk_heap->chunk_size);
 	num_chunks = allocated_size / chunk_heap->chunk_size;
 

drivers/staging/android/ion/ion_system_heap.c

@@ -148,9 +148,6 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
 	if (align > PAGE_SIZE)
 		return -EINVAL;
 
-	if (ion_buffer_fault_user_mappings(buffer))
-		return -EINVAL;
-
 	INIT_LIST_HEAD(&pages);
 	while (size_remaining > 0) {
 		info = alloc_largest_available(sys_heap, buffer, size_remaining, max_order);