netdev - Re: [patch net-next 1/3] idr: Add new APIs to support unsigned long

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Date:   Tue, 29 Aug 2017 09:14:04 +0200
From:   Hannes Frederic Sowa <hannes@...essinduktion.org>
To:     Chris Mi <chrism@...lanox.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, mawilcox@...rosoft.com
Subject: Re: [patch net-next 1/3] idr: Add new APIs to support unsigned long

Hello,

Chris Mi <chrism@...lanox.com> writes:

> The following new APIs are added:
>
> int idr_alloc_ext(struct idr *idr, void *ptr, unsigned long *index,
>                   unsigned long start, unsigned long end, gfp_t gfp);
> static inline void *idr_remove_ext(struct idr *idr, unsigned long id);
> static inline void *idr_find_ext(const struct idr *idr, unsigned long id);
> void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id);
> void *idr_get_next_ext(struct idr *idr, unsigned long *nextid);
>
> Signed-off-by: Chris Mi <chrism@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/linux/idr.h        | 16 ++++++++++
>  include/linux/radix-tree.h |  3 ++
>  lib/idr.c                  | 56 +++++++++++++++++++++++++++++++++++
>  lib/radix-tree.c           | 73 ++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 148 insertions(+)
>

[...]

> +int idr_alloc_ext(struct idr *idr, void *ptr, unsigned long *index,
> +		  unsigned long start, unsigned long end, gfp_t gfp)
> +{
> +	void __rcu **slot;
> +	struct radix_tree_iter iter;
> +
> +	if (WARN_ON_ONCE(radix_tree_is_internal_node(ptr)))
> +		return -EINVAL;
> +
> +	radix_tree_iter_init(&iter, start);
> +	slot = idr_get_free_ext(&idr->idr_rt, &iter, gfp, end);
> +	if (IS_ERR(slot))
> +		return PTR_ERR(slot);
> +
> +	radix_tree_iter_replace(&idr->idr_rt, &iter, slot, ptr);
> +	radix_tree_iter_tag_clear(&idr->idr_rt, &iter, IDR_FREE);
> +
> +	if (index)
> +		*index = iter.index;
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(idr_alloc_ext);

Can you express idr_alloc in terms of idr_alloc_ext? Same for most of
the other functions (it seems that signed int was used as return value
to indicate error cases, thus it should be easy to map those).

[...]

Thanks,
Hannes