2.6.26-rc2

 kernel

diff --git a/kernel/relay.c b/kernel/relay.c
index d6204a4..bc24dcd 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -65,6 +65,35 @@ 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
@@ -109,7 +138,7 @@ static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
    *size = PAGE_ALIGN(*size);
    n_pages = *size >> PAGE_SHIFT;
 
-   buf->page_array = kcalloc(n_pages, sizeof(struct page *), GFP_KERNEL);
+   buf->page_array = relay_alloc_page_array(n_pages);
    if (!buf->page_array)
       return NULL;
 
@@ -130,7 +159,7 @@ 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]);
-   kfree(buf->page_array);
+   relay_free_page_array(buf->page_array);
    return NULL;
 }
 
@@ -189,7 +218,7 @@ 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]);
-      kfree(buf->page_array);
+      relay_free_page_array(buf->page_array);
    }
    chan->buf[buf->cpu] = NULL;
    kfree(buf->padding);