include/asm-generic/irq_regs.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* Fallback per-CPU frame pointer holder
   3  *
   4  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #ifndef _ASM_GENERIC_IRQ_REGS_H
   9 #define _ASM_GENERIC_IRQ_REGS_H
  10
  11 #include <linux/percpu.h>
  12
  13 /*
  14  * Per-cpu current frame pointer - the location of the last exception frame on
  15  * the stack
  16  */
  17 DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
  18
  19 static inline struct pt_regs *get_irq_regs(void)
  20 {
  21         return __this_cpu_read(__irq_regs);
  22 }
  23
  24 static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
  25 {
  26         struct pt_regs *old_regs;
  27
  28         old_regs = __this_cpu_read(__irq_regs);
  29         __this_cpu_write(__irq_regs, new_regs);
  30         return old_regs;
  31 }
  32
  33 #endif /* _ASM_GENERIC_IRQ_REGS_H */