[PATCH] score: Use only next field for chain on/off

[Gedare Bloom]

Ok.

On Fri, Mar 14, 2014 at 8:56 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> It is sufficient to use one field for the chain on/off indication.  The
> chain API functions are highly performance critical.
> ---
>  cpukit/score/include/rtems/score/chainimpl.h |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/cpukit/score/include/rtems/score/chainimpl.h b/cpukit/score/include/rtems/score/chainimpl.h
> index 98416b2..1a7ee5d 100644
> --- a/cpukit/score/include/rtems/score/chainimpl.h
> +++ b/cpukit/score/include/rtems/score/chainimpl.h
> @@ -221,8 +221,8 @@ size_t _Chain_Node_count_unprotected( const Chain_Control *chain );
>  /**
>   * @brief Set off chain.
>   *
> - * This function sets the next and previous fields of the @a node to NULL
> - * indicating the @a node is not part of a chain.
> + * This function sets the next field of the @a node to NULL indicating the @a
> + * node is not part of a chain.
>   *
>   * @param[in] node the node set to off chain.
>   */
> @@ -230,14 +230,14 @@ RTEMS_INLINE_ROUTINE void _Chain_Set_off_chain(
>    Chain_Node *node
>  )
>  {
> -  node->next = node->previous = NULL;
> +  node->next = NULL;
>  }
>
>  /**
>   * @brief Is the node off chain.
>   *
> - * This function returns true if the @a node is not on a chain. A @a node is
> - * off chain if the next and previous fields are set to NULL.
> + * This function returns true if the @a node is not on a chain.  A @a node is
> + * off chain if the next field is set to NULL.
>   *
>   * @param[in] node is the node off chain.
>   *
> @@ -248,7 +248,7 @@ RTEMS_INLINE_ROUTINE bool _Chain_Is_node_off_chain(
>    const Chain_Node *node
>  )
>  {
> -  return (node->next == NULL) && (node->previous == NULL);
> +  return node->next == NULL;
>  }
>
>  /**
> --
> 1.7.7
>
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