nfs: disintegrate UAPI for nfs

This is to complete part of the Userspace API (UAPI) disintegration for which
the preparatory patches were pulled recently.  After these patches, userspace
headers will be segregated into:

        include/uapi/linux/.../foo.h

for the userspace interface stuff, and:

        include/linux/.../foo.h

for the strictly kernel internal stuff.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 65 insertions, 100 deletions

diff --git a/include/linux/timer.h b/include/linux/timer.h
index 6abd9138bed..8c5a197e158 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -49,147 +49,112 @@ extern struct tvec_base boot_tvec_bases;
 #endif
 
 /*
- * Note that all tvec_bases are 2 byte aligned and lower bit of
- * base in timer_list is guaranteed to be zero. Use the LSB to
- * indicate whether the timer is deferrable.
+ * Note that all tvec_bases are at least 4 byte aligned and lower two bits
+ * of base in timer_list is guaranteed to be zero. Use them for flags.
  *
  * A deferrable timer will work normally when the system is busy, but
  * will not cause a CPU to come out of idle just to service it; instead,
  * the timer will be serviced when the CPU eventually wakes up with a
  * subsequent non-deferrable timer.
+ *
+ * An irqsafe timer is executed with IRQ disabled and it's safe to wait for
+ * the completion of the running instance from IRQ handlers, for example,
+ * by calling del_timer_sync().
+ *
+ * Note: The irq disabled callback execution is a special case for
+ * workqueue locking issues. It's not meant for executing random crap
+ * with interrupts disabled. Abuse is monitored!
  */
-#define TBASE_DEFERRABLE_FLAG		(0x1)
+#define TIMER_DEFERRABLE		0x1LU
+#define TIMER_IRQSAFE			0x2LU
 
-#define TIMER_INITIALIZER(_function, _expires, _data) {		\
+#define TIMER_FLAG_MASK			0x3LU
+
+#define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \
 		.entry = { .prev = TIMER_ENTRY_STATIC },	\
 		.function = (_function),			\
 		.expires = (_expires),				\
 		.data = (_data),				\
-		.base = &boot_tvec_bases,			\
+		.base = (void *)((unsigned long)&boot_tvec_bases + (_flags)), \
 		.slack = -1,					\
 		__TIMER_LOCKDEP_MAP_INITIALIZER(		\
 			__FILE__ ":" __stringify(__LINE__))	\
 	}
 
-#define TBASE_MAKE_DEFERRED(ptr) ((struct tvec_base *)		\
-		  ((unsigned char *)(ptr) + TBASE_DEFERRABLE_FLAG))
+#define TIMER_INITIALIZER(_function, _expires, _data)		\
+	__TIMER_INITIALIZER((_function), (_expires), (_data), 0)
 
-#define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) {\
-		.entry = { .prev = TIMER_ENTRY_STATIC },	\
-		.function = (_function),			\
-		.expires = (_expires),				\
-		.data = (_data),				\
-		.base = TBASE_MAKE_DEFERRED(&boot_tvec_bases),	\
-		__TIMER_LOCKDEP_MAP_INITIALIZER(		\
-			__FILE__ ":" __stringify(__LINE__))	\
-	}
+#define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data)	\
+	__TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE)
 
 #define DEFINE_TIMER(_name, _function, _expires, _data)		\
 	struct timer_list _name =				\
 		TIMER_INITIALIZER(_function, _expires, _data)
 
-void init_timer_key(struct timer_list *timer,
-		    const char *name,
-		    struct lock_class_key *key);
-void init_timer_deferrable_key(struct timer_list *timer,
-			       const char *name,
-			       struct lock_class_key *key);
+void init_timer_key(struct timer_list *timer, unsigned int flags,
+		    const char *name, struct lock_class_key *key);
+
+#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
+extern void init_timer_on_stack_key(struct timer_list *timer,
+				    unsigned int flags, const char *name,
+				    struct lock_class_key *key);
+extern void destroy_timer_on_stack(struct timer_list *timer);
+#else
+static inline void destroy_timer_on_stack(struct timer_list *timer) { }
+static inline void init_timer_on_stack_key(struct timer_list *timer,
+					   unsigned int flags, const char *name,
+					   struct lock_class_key *key)
+{
+	init_timer_key(timer, flags, name, key);
+}
+#endif
 
 #ifdef CONFIG_LOCKDEP
-#define init_timer(timer)						\
+#define __init_timer(_timer, _flags)					\
 	do {								\
 		static struct lock_class_key __key;			\
-		init_timer_key((timer), #timer, &__key);		\
+		init_timer_key((_timer), (_flags), #_timer, &__key);	\
 	} while (0)
 
-#define init_timer_deferrable(timer)					\
+#define __init_timer_on_stack(_timer, _flags)				\
 	do {								\
 		static struct lock_class_key __key;			\
-		init_timer_deferrable_key((timer), #timer, &__key);	\
+		init_timer_on_stack_key((_timer), (_flags), #_timer, &__key); \
 	} while (0)
+#else
+#define __init_timer(_timer, _flags)					\
+	init_timer_key((_timer), (_flags), NULL, NULL)
+#define __init_timer_on_stack(_timer, _flags)				\
+	init_timer_on_stack_key((_timer), (_flags), NULL, NULL)
+#endif
 
+#define init_timer(timer)						\
+	__init_timer((timer), 0)
+#define init_timer_deferrable(timer)					\
+	__init_timer((timer), TIMER_DEFERRABLE)
 #define init_timer_on_stack(timer)					\
+	__init_timer_on_stack((timer), 0)
+
+#define __setup_timer(_timer, _fn, _data, _flags)			\
 	do {								\
-		static struct lock_class_key __key;			\
-		init_timer_on_stack_key((timer), #timer, &__key);	\
+		__init_timer((_timer), (_flags));			\
+		(_timer)->function = (_fn);				\
+		(_timer)->data = (_data);				\
 	} while (0)
 
-#define setup_timer(timer, fn, data)					\
+#define __setup_timer_on_stack(_timer, _fn, _data, _flags)		\
 	do {								\
-		static struct lock_class_key __key;			\
-		setup_timer_key((timer), #timer, &__key, (fn), (data));\
+		__init_timer_on_stack((_timer), (_flags));		\
+		(_timer)->function = (_fn);				\
+		(_timer)->data = (_data);				\
 	} while (0)
 
+#define setup_timer(timer, fn, data)					\
+	__setup_timer((timer), (fn), (data), 0)
 #define setup_timer_on_stack(timer, fn, data)				\
-	do {								\
-		static struct lock_class_key __key;			\
-		setup_timer_on_stack_key((timer), #timer, &__key,	\
-					 (fn), (data));			\
-	} while (0)
+	__setup_timer_on_stack((timer), (fn), (data), 0)
 #define setup_deferrable_timer_on_stack(timer, fn, data)		\
-	do {								\
-		static struct lock_class_key __key;			\
-		setup_deferrable_timer_on_stack_key((timer), #timer,	\
-						    &__key, (fn),	\
-						    (data));		\
-	} while (0)
-#else
-#define init_timer(timer)\
-	init_timer_key((timer), NULL, NULL)
-#define init_timer_deferrable(timer)\
-	init_timer_deferrable_key((timer), NULL, NULL)
-#define init_timer_on_stack(timer)\
-	init_timer_on_stack_key((timer), NULL, NULL)
-#define setup_timer(timer, fn, data)\
-	setup_timer_key((timer), NULL, NULL, (fn), (data))
-#define setup_timer_on_stack(timer, fn, data)\
-	setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
-#define setup_deferrable_timer_on_stack(timer, fn, data)\
-	setup_deferrable_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
-#endif
-
-#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
-extern void init_timer_on_stack_key(struct timer_list *timer,
-				    const char *name,
-				    struct lock_class_key *key);
-extern void destroy_timer_on_stack(struct timer_list *timer);
-#else
-static inline void destroy_timer_on_stack(struct timer_list *timer) { }
-static inline void init_timer_on_stack_key(struct timer_list *timer,
-					   const char *name,
-					   struct lock_class_key *key)
-{
-	init_timer_key(timer, name, key);
-}
-#endif
-
-static inline void setup_timer_key(struct timer_list * timer,
-				const char *name,
-				struct lock_class_key *key,
-				void (*function)(unsigned long),
-				unsigned long data)
-{
-	timer->function = function;
-	timer->data = data;
-	init_timer_key(timer, name, key);
-}
-
-static inline void setup_timer_on_stack_key(struct timer_list *timer,
-					const char *name,
-					struct lock_class_key *key,
-					void (*function)(unsigned long),
-					unsigned long data)
-{
-	timer->function = function;
-	timer->data = data;
-	init_timer_on_stack_key(timer, name, key);
-}
-
-extern void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
-						const char *name,
-						struct lock_class_key *key,
-						void (*function)(unsigned long),
-						unsigned long data);
+	__setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE)
 
 /**
  * timer_pending - is a timer pending?