[PATCH 4/7] relay: use simple_malloc()/simple_free()

[Lai Jiangshan <laijs@cn.fujitsu.com>]

simple_malloc()/simple_free() are same as current code.
so we simple_malloc()/simple_free() instead of current code.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/relay.c b/kernel/relay.c
index 8d13a78..718dd60 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -65,35 +65,6 @@ static struct vm_operations_struct relay_file_mmap_ops = {
 	.close = relay_file_mmap_close,
 };
 
-/*
- * allocate an array of pointers of struct page
- */
-static struct page **relay_alloc_page_array(unsigned int n_pages)
-{
-	struct page **array;
-	size_t pa_size = n_pages * sizeof(struct page *);
-
-	if (pa_size > PAGE_SIZE) {
-		array = vmalloc(pa_size);
-		if (array)
-			memset(array, 0, pa_size);
-	} else {
-		array = kzalloc(pa_size, GFP_KERNEL);
-	}
-	return array;
-}
-
-/*
- * free an array of pointers of struct page
- */
-static void relay_free_page_array(struct page **array)
-{
-	if (is_vmalloc_addr(array))
-		vfree(array);
-	else
-		kfree(array);
-}
-
 /**
  *	relay_mmap_buf: - mmap channel buffer to process address space
  *	@buf: relay channel buffer
@@ -138,9 +109,10 @@ static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
 	*size = PAGE_ALIGN(*size);
 	n_pages = *size >> PAGE_SHIFT;
 
-	buf->page_array = relay_alloc_page_array(n_pages);
+	buf->page_array = simple_malloc(sizeof(struct page *) * n_pages);
 	if (!buf->page_array)
 		return NULL;
+	memset(buf->page_array, 0, sizeof(struct page *) * n_pages);
 
 	for (i = 0; i < n_pages; i++) {
 		buf->page_array[i] = alloc_page(GFP_KERNEL);
@@ -159,7 +131,7 @@ static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
 depopulate:
 	for (j = 0; j < i; j++)
 		__free_page(buf->page_array[j]);
-	relay_free_page_array(buf->page_array);
+	simple_free(buf->page_array);
 	return NULL;
 }
 
@@ -218,7 +190,7 @@ static void relay_destroy_buf(struct rchan_buf *buf)
 		vunmap(buf->start);
 		for (i = 0; i < buf->page_count; i++)
 			__free_page(buf->page_array[i]);
-		relay_free_page_array(buf->page_array);
+		simple_free(buf->page_array);
 	}
 	chan->buf[buf->cpu] = NULL;
 	kfree(buf->padding);