Re: [PATCH 3/5] Swap Migration V4: migrate_pages() function

[Dave Hansen]

On Tue, 2005-10-25 at 12:30 -0700, Christoph Lameter wrote:
> 
> +#ifdef CONFIG_SWAP
> +       if (PageSwapCache(page)) {
> +               swp_entry_t swap = { .val = page_private(page) };
> +               add_to_swapped_list(swap.val);
> +               __delete_from_swap_cache(page);
> +               write_unlock_irq(&mapping->tree_lock);
> +               swap_free(swap);
> +               __put_page(page);       /* The pagecache ref */
> +               return 1;
> +       }
> +#endif /* CONFIG_SWAP */

Why is this #ifdef needed?  PageSwapCache() is #defined to 0 when !
CONFIG_SWAP.

-- Dave

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