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 #include <linux/jump_label.h>
   5
   6 DECLARE_STATIC_KEY_FALSE(uaccess_flush_key);
   7
   8 /* Prototype for function defined in exceptions-64s.S */
   9 void do_uaccess_flush(void);
  10
  11 static __always_inline void allow_user_access(void __user *to, const void __user *from,
  12                                               unsigned long size)
  13 {
  14 }
  15
  16 static inline void prevent_user_access(void __user *to, const void __user *from,
  17                                        unsigned long size)
  18 {
  19         if (static_branch_unlikely(&uaccess_flush_key))
  20                 do_uaccess_flush();
  21 }
  22
  23 #endif /* _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H */