2 files changed, 38 insertions, 14 deletions

diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl
index f8fe882e33dc..ea6f375475b8 100644
--- a/Documentation/DocBook/kernel-api.tmpl
+++ b/Documentation/DocBook/kernel-api.tmpl
@@ -202,6 +202,22 @@ X!Ilib/string.c
      </sect1>
   </chapter>
 
+  <chapter id="relayfs">
+     <title>relay interface support</title>
+
+     <para>
+        Relay interface support
+        is designed to provide an efficient mechanism for tools and
+        facilities to relay large amounts of data from kernel space to
+        user space.
+     </para>
+
+     <sect1><title>relay interface</title>
+!Ekernel/relay.c
+!Ikernel/relay.c
+     </sect1>
+  </chapter>
+
   <chapter id="vfs">
      <title>The Linux VFS</title>
      <sect1><title>The Filesystem types</title>
diff --git a/kernel/relay.c b/kernel/relay.c
index 85786ff2a4f9..1d63ecddfa70 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -95,7 +95,7 @@ int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
  *      @buf: the buffer struct
  *      @size: total size of the buffer
  *
- *      Returns a pointer to the resulting buffer, NULL if unsuccessful. The
+ *      Returns a pointer to the resulting buffer, %NULL if unsuccessful. The
  *      passed in size will get page aligned, if it isn't already.
  */
 static void *relay_alloc_buf(struct rchan_buf *buf, size_t *size)
@@ -132,10 +132,9 @@ depopulate:
 
 /**
  *      relay_create_buf - allocate and initialize a channel buffer
- *      @alloc_size: size of the buffer to allocate
- *      @n_subbufs: number of sub-buffers in the channel
+ *      @chan: the relay channel
  *
- *      Returns channel buffer if successful, NULL otherwise
+ *      Returns channel buffer if successful, %NULL otherwise.
  */
 struct rchan_buf *relay_create_buf(struct rchan *chan)
 {
@@ -163,6 +162,7 @@ free_buf:
 
 /**
  *      relay_destroy_channel - free the channel struct
+ *      @kref: target kernel reference that contains the relay channel
  *
  *      Should only be called from kref_put().
  */
@@ -194,6 +194,7 @@ void relay_destroy_buf(struct rchan_buf *buf)
 
 /**
  *      relay_remove_buf - remove a channel buffer
+ *      @kref: target kernel reference that contains the relay buffer
  *
  *      Removes the file from the fileystem, which also frees the
  *      rchan_buf_struct and the channel buffer.  Should only be called from
@@ -374,7 +375,7 @@ void relay_reset(struct rchan *chan)
 }
 EXPORT_SYMBOL_GPL(relay_reset);
 
-/**
+/*
  *      relay_open_buf - create a new relay channel buffer
  *
  *      Internal - used by relay_open().
@@ -448,12 +449,12 @@ static inline void setup_callbacks(struct rchan *chan,
 /**
  *      relay_open - create a new relay channel
  *      @base_filename: base name of files to create
- *      @parent: dentry of parent directory, NULL for root directory
+ *      @parent: dentry of parent directory, %NULL for root directory
  *      @subbuf_size: size of sub-buffers
  *      @n_subbufs: number of sub-buffers
  *      @cb: client callback functions
  *
- *      Returns channel pointer if successful, NULL otherwise.
+ *      Returns channel pointer if successful, %NULL otherwise.
  *
  *      Creates a channel buffer for each cpu using the sizes and
  *      attributes specified.  The created channel buffer files
@@ -585,7 +586,7 @@ EXPORT_SYMBOL_GPL(relay_switch_subbuf);
  *      subbufs_consumed should be the number of sub-buffers newly consumed,
  *      not the total consumed.
  *
- *      NOTE: kernel clients don't need to call this function if the channel
+ *      NOTE: Kernel clients don't need to call this function if the channel
  *      mode is 'overwrite'.
  */
 void relay_subbufs_consumed(struct rchan *chan,
@@ -641,7 +642,7 @@ EXPORT_SYMBOL_GPL(relay_close);
  *      relay_flush - close the channel
  *      @chan: the channel
  *
- *      Flushes all channel buffers i.e. forces buffer switch.
+ *      Flushes all channel buffers, i.e. forces buffer switch.
  */
 void relay_flush(struct rchan *chan)
 {
@@ -729,7 +730,7 @@ static int relay_file_release(struct inode *inode, struct file *filp)
         return 0;
 }
 
-/**
+/*
  *      relay_file_read_consume - update the consumed count for the buffer
  */
 static void relay_file_read_consume(struct rchan_buf *buf,
@@ -756,7 +757,7 @@ static void relay_file_read_consume(struct rchan_buf *buf,
         }
 }
 
-/**
+/*
  *      relay_file_read_avail - boolean, are there unconsumed bytes available?
  */
 static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
@@ -793,6 +794,8 @@ static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
 
 /**
  *      relay_file_read_subbuf_avail - return bytes available in sub-buffer
+ *      @read_pos: file read position
+ *      @buf: relay channel buffer
  */
 static size_t relay_file_read_subbuf_avail(size_t read_pos,
                                            struct rchan_buf *buf)
@@ -818,6 +821,8 @@ static size_t relay_file_read_subbuf_avail(size_t read_pos,
 
 /**
  *      relay_file_read_start_pos - find the first available byte to read
+ *      @read_pos: file read position
+ *      @buf: relay channel buffer
  *
  *      If the read_pos is in the middle of padding, return the
  *      position of the first actually available byte, otherwise
@@ -844,6 +849,9 @@ static size_t relay_file_read_start_pos(size_t read_pos,
 
 /**
  *      relay_file_read_end_pos - return the new read position
+ *      @read_pos: file read position
+ *      @buf: relay channel buffer
+ *      @count: number of bytes to be read
  */
 static size_t relay_file_read_end_pos(struct rchan_buf *buf,
                                       size_t read_pos,
@@ -865,7 +873,7 @@ static size_t relay_file_read_end_pos(struct rchan_buf *buf,
         return end_pos;
 }
 
-/**
+/*
  *      subbuf_read_actor - read up to one subbuf's worth of data
  */
 static int subbuf_read_actor(size_t read_start,
@@ -890,7 +898,7 @@ static int subbuf_read_actor(size_t read_start,
         return ret;
 }
 
-/**
+/*
  *      subbuf_send_actor - send up to one subbuf's worth of data
  */
 static int subbuf_send_actor(size_t read_start,
@@ -933,7 +941,7 @@ typedef int (*subbuf_actor_t) (size_t read_start,
                                read_descriptor_t *desc,
                                read_actor_t actor);
 
-/**
+/*
  *      relay_file_read_subbufs - read count bytes, bridging subbuf boundaries
  */
 static inline ssize_t relay_file_read_subbufs(struct file *filp,