#include <linux/preempt.h>
#include <linux/smp_lock.h>
+#include <linux/lockdep.h>
#include <asm/hardirq.h>
#include <asm/system.h>
#ifndef HARDIRQ_BITS
#define HARDIRQ_BITS 12
+
+#ifndef MAX_HARDIRQS_PER_CPU
+#define MAX_HARDIRQS_PER_CPU NR_IRQS
+#endif
+
/*
* The hardirq mask has to be large enough to have space for potentially
* all IRQ sources in the system nesting on a single CPU.
*/
-#if (1 << HARDIRQ_BITS) < NR_IRQS
+#if (1 << HARDIRQ_BITS) < MAX_HARDIRQS_PER_CPU
# error HARDIRQ_BITS is too low!
#endif
#endif
#define in_softirq() (softirq_count())
#define in_interrupt() (irq_count())
-#if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_BKL)
-# define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
+#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
+
+#ifdef CONFIG_PREEMPT
+# define PREEMPT_CHECK_OFFSET 1
#else
-# define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
+# define PREEMPT_CHECK_OFFSET 0
#endif
+/*
+ * Check whether we were atomic before we did preempt_disable():
+ * (used by the scheduler)
+ */
+#define in_atomic_preempt_off() \
+ ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET)
+
#ifdef CONFIG_PREEMPT
# define preemptible() (preempt_count() == 0 && !irqs_disabled())
# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
# define synchronize_irq(irq) barrier()
#endif
-#define nmi_enter() irq_enter()
-#define nmi_exit() sub_preempt_count(HARDIRQ_OFFSET)
-
struct task_struct;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
}
#endif
-#define irq_enter() \
+/*
+ * 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_system_vtime(current); \
add_preempt_count(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_system_vtime(current); \
+ sub_preempt_count(HARDIRQ_OFFSET); \
+ } while (0)
+
+/*
+ * Exit irq context and process softirqs if needed:
+ */
extern void irq_exit(void);
+#define nmi_enter() do { lockdep_off(); __irq_enter(); } while (0)
+#define nmi_exit() do { __irq_exit(); lockdep_on(); } while (0)
+
#endif /* LINUX_HARDIRQ_H */