The function does not exist anymore.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
 
-extern int task_can_switch_user(struct user_struct *up,
-                                       struct task_struct *tsk);
-
 #ifndef TASK_SIZE_OF
 #define TASK_SIZE_OF(tsk)      TASK_SIZE
 #endif