auxdisplay: small cleanups

- Use BUILD_BUG_ON for CFAG12864B_SIZE instead of runtime-check

- Use get_zeroed_page()

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Miguel Ojeda Sandonis <maxextreme@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/auxdisplay/cfag12864b.c b/drivers/auxdisplay/cfag12864b.c
index 683509f..eacb175 100644 (file)
--- a/drivers/auxdisplay/cfag12864b.c
+++ b/drivers/auxdisplay/cfag12864b.c
@@ -336,16 +336,9 @@ static int __init cfag12864b_init(void)
                        "ks0108 is not initialized\n");
                goto none;
        }
+       BUILD_BUG_ON(PAGE_SIZE < CFAG12864B_SIZE);
 
-       if (PAGE_SIZE < CFAG12864B_SIZE) {
-               printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
-                       "page size (%i) < cfag12864b size (%i)\n",
-                       (unsigned int)PAGE_SIZE, CFAG12864B_SIZE);
-               ret = -ENOMEM;
-               goto none;
-       }
-
-       cfag12864b_buffer = (unsigned char *) __get_free_page(GFP_KERNEL);
+       cfag12864b_buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
        if (cfag12864b_buffer == NULL) {
                printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
                        "can't get a free page\n");
@@ -367,8 +360,6 @@ static int __init cfag12864b_init(void)
        if (cfag12864b_workqueue == NULL)
                goto cachealloced;
 
-       memset(cfag12864b_buffer, 0, CFAG12864B_SIZE);
-
        cfag12864b_clear();
        cfag12864b_on();