diff options
Diffstat (limited to 'kernel/include/linux/hardirq.h')
-rw-r--r-- | kernel/include/linux/hardirq.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/kernel/include/linux/hardirq.h b/kernel/include/linux/hardirq.h new file mode 100644 index 000000000..f4af03404 --- /dev/null +++ b/kernel/include/linux/hardirq.h @@ -0,0 +1,82 @@ +#ifndef LINUX_HARDIRQ_H +#define LINUX_HARDIRQ_H + +#include <linux/preempt_mask.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); + +#define nmi_enter() \ + do { \ + 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(); \ + } while (0) + +#endif /* LINUX_HARDIRQ_H */ |