On Fri, 8 Aug 2014 13:23:14 -0700 Laura Abbott <lauraa@xxxxxxxxxxxxxx> wrote:
>
> After allocating an address from a particular genpool,
> there is no good way to verify if that address actually
> belongs to a genpool. Introduce addr_in_gen_pool which
> will return if an address plus size falls completely
> within the genpool range.
>
> ...
>
> /**
> + * addr_in_gen_pool - checks if an address falls within the range of a pool
> + * @pool: the generic memory pool
> + * @start: start address
> + * @size: size of the region
> + *
> + * Check if the range of addresses falls within the specified pool.
This description should make it clear that the entire range must be
within the pool - that an overlap is "no".
> Takes
> + * the rcu_read_lock for the duration of the check.
I don't think this part is worth including.
> + */
> +bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
> + size_t size)
> +{
> + bool found = false;
> + unsigned long end = start + size;
> + struct gen_pool_chunk *chunk;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) {
> + if (start >= chunk->start_addr && start <= chunk->end_addr) {
> + if (end <= chunk->end_addr) {
> + found = true;
> + break;
> + }
> + }
> + }
> + rcu_read_unlock();
> + return found;
> +}
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