Re: [PATCH -V6 06/21] swap: Support PMD swap mapping when splitting huge PMD

[Daniel Jordan]

On Wed, Oct 10, 2018 at 03:19:09PM +0800, Huang Ying wrote:
> +#ifdef CONFIG_THP_SWAP
> +/*
> + * The corresponding page table shouldn't be changed under us, that
> + * is, the page table lock should be held.
> + */
> +int split_swap_cluster_map(swp_entry_t entry)
> +{
> +	struct swap_info_struct *si;
> +	struct swap_cluster_info *ci;
> +	unsigned long offset = swp_offset(entry);
> +
> +	VM_BUG_ON(!IS_ALIGNED(offset, SWAPFILE_CLUSTER));
> +	si = _swap_info_get(entry);
> +	if (!si)
> +		return -EBUSY;

I think this return value doesn't get used anywhere?