Re: [PATCH] util/iova-tree: Remove deadcode

[Peter Xu <peterx@redhat.com>]

On Wed, Sep 18, 2024 at 03:25:15PM +0100, dave@treblig.org wrote:
> From: "Dr. David Alan Gilbert" <dave@treblig.org>
> 
> iova_tree_find_address, and iova_tree_foreach have never been
> used since the code was originally added by:
>   eecf5eedbd ("util: implement simple iova tree")
> 
> Remove them.
> 
> Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

Michael, Jason,

It seems iova now has its own entry in MAINTAINERS, however this is
currently used either by VT-d or vhost.  Maybe it makes more sense that you
maintain this small file together with vt-d/vhost (considering I dropped
myself from VT-d development)?

Please feel free to pick up this patch if you want, or let me know if you
want me to do that.

PS: if you agree on above, I can move on with a MAINTAINERS file change to
drop myself from IOVA tree maintainers, then I'll add both of you in, if
that sounds good to you.

Thanks!

> ---
>  include/qemu/iova-tree.h | 25 -------------------------
>  util/iova-tree.c         | 23 -----------------------
>  2 files changed, 48 deletions(-)
> 
> diff --git a/include/qemu/iova-tree.h b/include/qemu/iova-tree.h
> index 2a10a7052e..44a45931d5 100644
> --- a/include/qemu/iova-tree.h
> +++ b/include/qemu/iova-tree.h
> @@ -111,31 +111,6 @@ const DMAMap *iova_tree_find(const IOVATree *tree, const DMAMap *map);
>   */
>  const DMAMap *iova_tree_find_iova(const IOVATree *tree, const DMAMap *map);
>  
> -/**
> - * iova_tree_find_address:
> - *
> - * @tree: the iova tree to search from
> - * @iova: the iova address to find
> - *
> - * Similar to iova_tree_find(), but it tries to find mapping with
> - * range iova=iova & size=0.
> - *
> - * Return: same as iova_tree_find().
> - */
> -const DMAMap *iova_tree_find_address(const IOVATree *tree, hwaddr iova);
> -
> -/**
> - * iova_tree_foreach:
> - *
> - * @tree: the iova tree to iterate on
> - * @iterator: the iterator for the mappings, return true to stop
> - *
> - * Iterate over the iova tree.
> - *
> - * Return: 1 if found any overlap, 0 if not, <0 if error.
> - */
> -void iova_tree_foreach(IOVATree *tree, iova_tree_iterator iterator);
> -
>  /**
>   * iova_tree_alloc_map:
>   *
> diff --git a/util/iova-tree.c b/util/iova-tree.c
> index 536789797e..06295e2755 100644
> --- a/util/iova-tree.c
> +++ b/util/iova-tree.c
> @@ -115,13 +115,6 @@ const DMAMap *iova_tree_find_iova(const IOVATree *tree, const DMAMap *map)
>      return args.result;
>  }
>  
> -const DMAMap *iova_tree_find_address(const IOVATree *tree, hwaddr iova)
> -{
> -    const DMAMap map = { .iova = iova, .size = 0 };
> -
> -    return iova_tree_find(tree, &map);
> -}
> -
>  static inline void iova_tree_insert_internal(GTree *gtree, DMAMap *range)
>  {
>      /* Key and value are sharing the same range data */
> @@ -148,22 +141,6 @@ int iova_tree_insert(IOVATree *tree, const DMAMap *map)
>      return IOVA_OK;
>  }
>  
> -static gboolean iova_tree_traverse(gpointer key, gpointer value,
> -                                gpointer data)
> -{
> -    iova_tree_iterator iterator = data;
> -    DMAMap *map = key;
> -
> -    g_assert(key == value);
> -
> -    return iterator(map);
> -}
> -
> -void iova_tree_foreach(IOVATree *tree, iova_tree_iterator iterator)
> -{
> -    g_tree_foreach(tree->tree, iova_tree_traverse, iterator);
> -}
> -
>  void iova_tree_remove(IOVATree *tree, DMAMap map)
>  {
>      const DMAMap *overlap;
> -- 
> 2.46.0
> 

-- 
Peter Xu