Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88...
[linux-2.6-microblaze.git] / include / linux / hardirq.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef LINUX_HARDIRQ_H
3 #define LINUX_HARDIRQ_H
4
5 #include <linux/preempt.h>
6 #include <linux/lockdep.h>
7 #include <linux/ftrace_irq.h>
8 #include <linux/vtime.h>
9 #include <asm/hardirq.h>
10
11
12 extern void synchronize_irq(unsigned int irq);
13 extern bool synchronize_hardirq(unsigned int irq);
14
15 #if defined(CONFIG_TINY_RCU)
16
17 static inline void rcu_nmi_enter(void)
18 {
19 }
20
21 static inline void rcu_nmi_exit(void)
22 {
23 }
24
25 #else
26 extern void rcu_nmi_enter(void);
27 extern void rcu_nmi_exit(void);
28 #endif
29
30 /*
31  * It is safe to do non-atomic ops on ->hardirq_context,
32  * because NMI handlers may not preempt and the ops are
33  * always balanced, so the interrupted value of ->hardirq_context
34  * will always be restored.
35  */
36 #define __irq_enter()                                   \
37         do {                                            \
38                 account_irq_enter_time(current);        \
39                 preempt_count_add(HARDIRQ_OFFSET);      \
40                 trace_hardirq_enter();                  \
41         } while (0)
42
43 /*
44  * Enter irq context (on NO_HZ, update jiffies):
45  */
46 extern void irq_enter(void);
47
48 /*
49  * Exit irq context without processing softirqs:
50  */
51 #define __irq_exit()                                    \
52         do {                                            \
53                 trace_hardirq_exit();                   \
54                 account_irq_exit_time(current);         \
55                 preempt_count_sub(HARDIRQ_OFFSET);      \
56         } while (0)
57
58 /*
59  * Exit irq context and process softirqs if needed:
60  */
61 extern void irq_exit(void);
62
63 #define nmi_enter()                                             \
64         do {                                                    \
65                 printk_nmi_enter();                             \
66                 lockdep_off();                                  \
67                 ftrace_nmi_enter();                             \
68                 BUG_ON(in_nmi());                               \
69                 preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
70                 rcu_nmi_enter();                                \
71                 trace_hardirq_enter();                          \
72         } while (0)
73
74 #define nmi_exit()                                              \
75         do {                                                    \
76                 trace_hardirq_exit();                           \
77                 rcu_nmi_exit();                                 \
78                 BUG_ON(!in_nmi());                              \
79                 preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
80                 ftrace_nmi_exit();                              \
81                 lockdep_on();                                   \
82                 printk_nmi_exit();                              \
83         } while (0)
84
85 #endif /* LINUX_HARDIRQ_H */