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SubjectRe: [PATCH 3/5] Swap Migration V4: migrate_pages() function
FromDave Hansen <>
DateWed, 26 Oct 2005 09:15:34 +0200
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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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