On 01/13/2015 07:21 PM, Fabian Frederick wrote:
> suitable_migration_target() is only used by isolate_freepages()
> Define it under CONFIG_COMPACTION || CONFIG_CMA is not needed.
>
> Fix the following warning:
> mm/compaction.c:311:13: warning: 'suitable_migration_target' defined
> but not used [-Wunused-function]
>
> Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Thanks.
> ---
> v2: move function below update_pageblock_skip() instead of above
> isolate_freepages() (suggested by Vlastimil Babka)
>
>
> mm/compaction.c | 44 ++++++++++++++++++++++----------------------
> 1 file changed, 22 insertions(+), 22 deletions(-)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 546e571..580790d 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -207,6 +207,28 @@ static void update_pageblock_skip(struct compact_control *cc,
> zone->compact_cached_free_pfn = pfn;
> }
> }
> +
> +/* Returns true if the page is within a block suitable for migration to */
> +static bool suitable_migration_target(struct page *page)
> +{
> + /* If the page is a large free page, then disallow migration */
> + if (PageBuddy(page)) {
> + /*
> + * We are checking page_order without zone->lock taken. But
> + * the only small danger is that we skip a potentially suitable
> + * pageblock, so it's not worth to check order for valid range.
> + */
> + if (page_order_unsafe(page) >= pageblock_order)
> + return false;
> + }
> +
> + /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
> + if (migrate_async_suitable(get_pageblock_migratetype(page)))
> + return true;
> +
> + /* Otherwise skip the block */
> + return false;
> +}
> #else
> static inline bool isolation_suitable(struct compact_control *cc,
> struct page *page)
> @@ -307,28 +329,6 @@ static inline bool compact_should_abort(struct compact_control *cc)
> return false;
> }
>
> -/* Returns true if the page is within a block suitable for migration to */
> -static bool suitable_migration_target(struct page *page)
> -{
> - /* If the page is a large free page, then disallow migration */
> - if (PageBuddy(page)) {
> - /*
> - * We are checking page_order without zone->lock taken. But
> - * the only small danger is that we skip a potentially suitable
> - * pageblock, so it's not worth to check order for valid range.
> - */
> - if (page_order_unsafe(page) >= pageblock_order)
> - return false;
> - }
> -
> - /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
> - if (migrate_async_suitable(get_pageblock_migratetype(page)))
> - return true;
> -
> - /* Otherwise skip the block */
> - return false;
> -}
> -
> /*
> * Isolate free pages onto a private freelist. If @strict is true, will abort
> * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
>
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