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

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Date:   Tue, 29 Aug 2017 09:56:02 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:     Chris Mi <chrism@...lanox.com>, netdev@...r.kernel.org,
        jhs@...atatu.com, xiyou.wangcong@...il.com, davem@...emloft.net,
        mawilcox@...rosoft.com
Subject: Re: [patch net-next 1/3] idr: Add new APIs to support unsigned long

Tue, Aug 29, 2017 at 09:14:04AM CEST, hannes@...essinduktion.org wrote:
>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).

Agreed. Same for free function.


>
>[...]
>
>Thanks,
>Hannes