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hardirq.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef LINUX_HARDIRQ_H #define LINUX_HARDIRQ_H #include <linux/preempt.h> #include <linux/lockdep.h> #include <linux/ftrace_irq.h> #include <linux/vtime.h> #include <asm/hardirq.h> extern void synchronize_irq(unsigned int irq); extern bool synchronize_hardirq(unsigned int irq); #if defined(CONFIG_TINY_RCU) static inline void rcu_nmi_enter(void) { } static inline void rcu_nmi_exit(void) { } #else extern void rcu_nmi_enter(void); extern void rcu_nmi_exit(void); #endif /* * It is safe to do non-atomic ops on ->hardirq_context, * because NMI handlers may not preempt and the ops are * always balanced, so the interrupted value of ->hardirq_context * will always be restored. */ #define __irq_enter() \ do { \ account_irq_enter_time(current); \ preempt_count_add(HARDIRQ_OFFSET); \ trace_hardirq_enter(); \ } while (0) /* * Enter irq context (on NO_HZ, update jiffies): */ extern void irq_enter(void); /* * Exit irq context without processing softirqs: */ #define __irq_exit() \ do { \ trace_hardirq_exit(); \ account_irq_exit_time(current); \ preempt_count_sub(HARDIRQ_OFFSET); \ } while (0) /* * Exit irq context and process softirqs if needed: */ extern void irq_exit(void); #ifndef arch_nmi_enter #define arch_nmi_enter() do { } while (0) #define arch_nmi_exit() do { } while (0) #endif #define nmi_enter() \ do { \ arch_nmi_enter(); \ printk_nmi_enter(); \ lockdep_off(); \ ftrace_nmi_enter(); \ BUG_ON(in_nmi()); \ preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \ rcu_nmi_enter(); \ trace_hardirq_enter(); \ } while (0) #define nmi_exit() \ do { \ trace_hardirq_exit(); \ rcu_nmi_exit(); \ BUG_ON(!in_nmi()); \ preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \ ftrace_nmi_exit(); \ lockdep_on(); \ printk_nmi_exit(); \ arch_nmi_exit(); \ } while (0) #endif /* LINUX_HARDIRQ_H */