include/asm-generic/switch_to.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* Generic task switch macro wrapper.
   3  *
   4  * It should be possible to use these on really simple architectures,
   5  * but it serves more as a starting point for new ports.
   6  *
   7  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   8  * Written by David Howells (dhowells@redhat.com)
   9  */
  10 #ifndef __ASM_GENERIC_SWITCH_TO_H
  11 #define __ASM_GENERIC_SWITCH_TO_H
  12
  13 #include <linux/thread_info.h>
  14
  15 /*
  16  * Context switching is now performed out-of-line in switch_to.S
  17  */
  18 extern struct task_struct *__switch_to(struct task_struct *,
  19                                        struct task_struct *);
  20
  21 #define switch_to(prev, next, last)                                     \
  22         do {                                                            \
  23                 ((last) = __switch_to((prev), (next)));                 \
  24         } while (0)
  25
  26 #endif /* __ASM_GENERIC_SWITCH_TO_H */