struct epoll_event; /* fortunately, this one is fixed-layout */
-extern void __user *compat_alloc_user_space(unsigned long len);
-
int compat_restore_altstack(const compat_stack_t __user *uss);
int __compat_save_altstack(compat_stack_t __user *, unsigned long);
#define unsafe_compat_save_altstack(uss, sp, label) do { \