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 
get_irq_regs(void)19 static inline struct pt_regs *get_irq_regs(void)
20 {
21 	return __this_cpu_read(__irq_regs);
22 }
23 
set_irq_regs(struct pt_regs * new_regs)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 */
34