linux-kernel - Re: [PATCH 2/4] idr: Add a function idr

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Date:   Mon, 25 Sep 2017 09:20:07 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Gargi Sharma <gs051095@...il.com>, linux-kernel@...r.kernel.org
Cc:     julia.lawall@...6.fr, akpm@...ux-foundation.org, mingo@...nel.org,
        pasha.tatashin@...cle.com, ktkhai@...tuozzo.com, oleg@...hat.com
Subject: Re: [PATCH 2/4] idr: Add a function idr_get()

On Mon, 2017-09-25 at 08:56 -0400, Gargi Sharma wrote:
> idr_get(namespace, id) returns a NULL if id is not present
> in the idr tree or returns the pointer to the struct if id is
> present in the idr tree. With this function in the idr library,
> code for pid allocation can be simplified by calling this function
> instead of looking through the pidhash.

> +++ b/lib/idr.c
> @@ -135,6 +135,17 @@ void *idr_get_next_ext(struct idr *idr, unsigned
> long *nextid)
>  }
>  EXPORT_SYMBOL(idr_get_next_ext);
>  
> +void * idr_get(struct idr *idr, int *id)
> +{
> +	struct radix_tree_node *node;
> +	void __rcu **slot = NULL;
> +
> +	__radix_tree_lookup(&idr->idr_rt, *id, &node, &slot);
> +	if (!slot)
> +		return NULL;
> +	return node;
> +}

I should have noticed this (much) earlier, but doesn't idr_get do
essentially the same thing as idr_find?

Also, wouldn't you want to return the pid pointer from slot,
rather than a pointer to the entire radix tree node?

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