#include <linux/slab.h>
#include <linux/ioport.h>
#include <asm/page.h>
-#include <asm/system.h>
#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <linux/poll.h>
#undef PSEUDO_DMA_AUTOINIT
#define ALLOW_BUFFER_MAPPING
-extern struct file_operations oss_sound_fops;
+extern const struct file_operations oss_sound_fops;