lguest: cleanup for map_switcher()

We can use alloc_page() instead of get_zeroed_page() and virt_to_page()

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index 1e2cb846b3c9..8744d24ac6e6 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -67,12 +67,11 @@ static __init int map_switcher(void)
          * so we make sure they're zeroed.
          */
         for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) {
-                unsigned long addr = get_zeroed_page(GFP_KERNEL);
-                if (!addr) {
+                switcher_page[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
+                if (!switcher_page[i]) {
                         err = -ENOMEM;
                         goto free_some_pages;
                 }
-                switcher_page[i] = virt_to_page(addr);
         }
 
         /*