arch/powerpc/include/asm/book3s/64/kup-radix.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H
   3 #define _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H
   4
   5 DECLARE_STATIC_KEY_FALSE(uaccess_flush_key);
   6
   7 /* Prototype for function defined in exceptions-64s.S */
   8 void do_uaccess_flush(void);
   9
  10 static __always_inline void allow_user_access(void __user *to, const void __user *from,
  11                                               unsigned long size)
  12 {
  13 }
  14
  15 static inline void prevent_user_access(void __user *to, const void __user *from,
  16                                        unsigned long size)
  17 {
  18         if (static_branch_unlikely(&uaccess_flush_key))
  19                 do_uaccess_flush();
  20 }
  21
  22 #endif /* _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H */