include/linux/sync_core.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SYNC_CORE_H
   3 #define _LINUX_SYNC_CORE_H
   4
   5 #ifdef CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
   6 #include <asm/sync_core.h>
   7 #else
   8 /*
   9  * This is a dummy sync_core_before_usermode() implementation that can be used
  10  * on all architectures which return to user-space through core serializing
  11  * instructions.
  12  * If your architecture returns to user-space through non-core-serializing
  13  * instructions, you need to write your own functions.
  14  */
  15 static inline void sync_core_before_usermode(void)
  16 {
  17 }
  18 #endif
  19
  20 #ifdef CONFIG_ARCH_HAS_PREPARE_SYNC_CORE_CMD
  21 #include <asm/sync_core.h>
  22 #else
  23 /*
  24  * This is a dummy prepare_sync_core_cmd() implementation that can be used on
  25  * all architectures which provide unconditional core serializing instructions
  26  * in switch_mm().
  27  * If your architecture doesn't provide such core serializing instructions in
  28  * switch_mm(), you may need to write your own functions.
  29  */
  30 static inline void prepare_sync_core_cmd(struct mm_struct *mm)
  31 {
  32 }
  33 #endif
  34
  35 #endif /* _LINUX_SYNC_CORE_H */