This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / irqflags.h

diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
new file mode 100644 (file)
index 0000000..412e025
--- /dev/null
+++ b/include/linux/irqflags.h
@@ -0,0 +1,96 @@
+/*
+ * include/linux/irqflags.h
+ *
+ * IRQ flags tracing: follow the state of the hardirq and softirq flags and
+ * provide callbacks for transitions between ON and OFF states.
+ *
+ * This file gets included from lowlevel asm headers too, to provide
+ * wrapped versions of the local_irq_*() APIs, based on the
+ * raw_local_irq_*() macros from the lowlevel headers.
+ */
+#ifndef _LINUX_TRACE_IRQFLAGS_H
+#define _LINUX_TRACE_IRQFLAGS_H
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+  extern void trace_hardirqs_on(void);
+  extern void trace_hardirqs_off(void);
+  extern void trace_softirqs_on(unsigned long ip);
+  extern void trace_softirqs_off(unsigned long ip);
+# define trace_hardirq_context(p)      ((p)->hardirq_context)
+# define trace_softirq_context(p)      ((p)->softirq_context)
+# define trace_hardirqs_enabled(p)     ((p)->hardirqs_enabled)
+# define trace_softirqs_enabled(p)     ((p)->softirqs_enabled)
+# define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
+# define trace_hardirq_exit()  do { current->hardirq_context--; } while (0)
+# define trace_softirq_enter() do { current->softirq_context++; } while (0)
+# define trace_softirq_exit()  do { current->softirq_context--; } while (0)
+# define INIT_TRACE_IRQFLAGS   .softirqs_enabled = 1,
+#else
+# define trace_hardirqs_on()           do { } while (0)
+# define trace_hardirqs_off()          do { } while (0)
+# define trace_softirqs_on(ip)         do { } while (0)
+# define trace_softirqs_off(ip)                do { } while (0)
+# define trace_hardirq_context(p)      0
+# define trace_softirq_context(p)      0
+# define trace_hardirqs_enabled(p)     0
+# define trace_softirqs_enabled(p)     0
+# define trace_hardirq_enter()         do { } while (0)
+# define trace_hardirq_exit()          do { } while (0)
+# define trace_softirq_enter()         do { } while (0)
+# define trace_softirq_exit()          do { } while (0)
+# define INIT_TRACE_IRQFLAGS
+#endif
+
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+
+#include <asm/irqflags.h>
+
+#define local_irq_enable() \
+       do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
+#define local_irq_disable() \
+       do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
+#define local_irq_save(flags) \
+       do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0)
+
+#define local_irq_restore(flags)                               \
+       do {                                                    \
+               if (raw_irqs_disabled_flags(flags)) {           \
+                       raw_local_irq_restore(flags);           \
+                       trace_hardirqs_off();                   \
+               } else {                                        \
+                       trace_hardirqs_on();                    \
+                       raw_local_irq_restore(flags);           \
+               }                                               \
+       } while (0)
+#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
+/*
+ * The local_irq_*() APIs are equal to the raw_local_irq*()
+ * if !TRACE_IRQFLAGS.
+ */
+# define raw_local_irq_disable()       local_irq_disable()
+# define raw_local_irq_enable()                local_irq_enable()
+# define raw_local_irq_save(flags)     local_irq_save(flags)
+# define raw_local_irq_restore(flags)  local_irq_restore(flags)
+#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
+
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+#define safe_halt()                                            \
+       do {                                                    \
+               trace_hardirqs_on();                            \
+               raw_safe_halt();                                \
+       } while (0)
+
+#define local_save_flags(flags)                raw_local_save_flags(flags)
+
+#define irqs_disabled()                                                \
+({                                                             \
+       unsigned long flags;                                    \
+                                                               \
+       raw_local_save_flags(flags);                            \
+       raw_irqs_disabled_flags(flags);                         \
+})
+
+#define irqs_disabled_flags(flags)     raw_irqs_disabled_flags(flags)
+#endif         /* CONFIG_X86 */
+
+#endif