srcu: Add comments for srcu_size_state

	struct lockdep_map dep_map;

};

/* Values for size state variable (->srcu_size_state). */

#define SRCU_SIZE_SMALL		0

#define SRCU_SIZE_ALLOC		1

#define SRCU_SIZE_WAIT_BARRIER	2

#define SRCU_SIZE_WAIT_CALL	3

#define SRCU_SIZE_WAIT_CBS1	4

#define SRCU_SIZE_WAIT_CBS2	5

#define SRCU_SIZE_WAIT_CBS3	6

#define SRCU_SIZE_WAIT_CBS4	7

#define SRCU_SIZE_BIG		8

// Values for size state variable (->srcu_size_state).  Once the state

// has been set to SRCU_SIZE_ALLOC, the grace-period code advances through

// this state machine one step per grace period until the SRCU_SIZE_BIG state

// is reached.  Otherwise, the state machine remains in the SRCU_SIZE_SMALL

// state indefinitely.

#define SRCU_SIZE_SMALL		0	// No srcu_node combining tree, ->node == NULL

#define SRCU_SIZE_ALLOC		1	// An srcu_node tree is being allocated, initialized,

					//  and then referenced by ->node.  It will not be used.

#define SRCU_SIZE_WAIT_BARRIER	2	// The srcu_node tree starts being used by everything

					//  except call_srcu(), especially by srcu_barrier().

					//  By the end of this state, all CPUs and threads

					//  are aware of this tree's existence.

#define SRCU_SIZE_WAIT_CALL	3	// The srcu_node tree starts being used by call_srcu().

					//  By the end of this state, all of the call_srcu()

					//  invocations that were running on a non-boot CPU

					//  and using the boot CPU's callback queue will have

					//  completed.

#define SRCU_SIZE_WAIT_CBS1	4	// Don't trust the ->srcu_have_cbs[] grace-period

#define SRCU_SIZE_WAIT_CBS2	5	//  sequence elements or the ->srcu_data_have_cbs[]

#define SRCU_SIZE_WAIT_CBS3	6	//  CPU-bitmask elements until all four elements of

#define SRCU_SIZE_WAIT_CBS4	7	//  each array have been initialized.

#define SRCU_SIZE_BIG		8	// The srcu_node combining tree is fully initialized

					//  and all aspects of it are being put to use.

/* Values for state variable (bottom bits of ->srcu_gp_seq). */

#define SRCU_STATE_IDLE		0