From bde7de23c42e83b8ec45655bcbd8e24eecbda895 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Fri, 28 Sep 2012 10:19:47 +1000 Subject: [PATCH] mm-compaction-cache-if-a-pageblock-was-scanned-and-no-pages-were-isolated-fix Fengguang Wu reported the following tree: git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.5 head: 2f641f902ca76711e47e8d3b18004f0e46ca3d9b commit: 7faeb2a39c789f1bac69014cc468677a60b73395 [184/186] mm: compaction: cache if a pageblock was scanned and no pages were isolated config: i386-randconfig-b083 (attached as .config) All error/warnings: mm/compaction.c: In function 'isolation_suitable': mm/compaction.c:60:2: error: implicit declaration of function 'get_pageblock_skip' [-Werror=implicit-function-declaration] mm/compaction.c: In function 'reset_isolation_suitable': mm/compaction.c:94:3: error: implicit declaration of function 'clear_pageblock_skip' [-Werror=implicit-function-declaration] mm/compaction.c: In function 'update_pageblock_skip': mm/compaction.c:108:3: error: implicit declaration of function 'set_pageblock_skip' [-Werror=implicit-function-declaration] mm/compaction.c: At top level: mm/compaction.c:68:13: warning: 'reset_isolation_suitable' defined but not used [-Wunused-function] mm/compaction.c:177:13: warning: 'compact_capture_page' defined but not used [-Wunused-function] cc1: some warnings being treated as errors Michal Hocko suggested implementing !CONFIG_COMPACTION versions of these functions but that still leaves the dead version of reset_isolation_suitable in the !CONFIG_COMPACTION && CONFIG_CMA case. Create !CONFIG_COMPACTION versions of isolation_suitable() and update_pageblock_skip() instead. This is a fix for mm-compaction-cache-if-a-pageblock-was-scanned-and-no-pages-were-isolated.patch Reported-by: Fengguang Wu Signed-off-by: Mel Gorman Cc: Rik van Riel Cc: Shaohua Li Cc: Rafael Aquini Cc: Michal Hocko Cc: Dan Carpenter Signed-off-by: Andrew Morton --- mm/compaction.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index c1bcce2db669..e54027411a6c 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -50,6 +50,7 @@ static inline bool migrate_async_suitable(int migratetype) return is_migrate_cma(migratetype) || migratetype == MIGRATE_MOVABLE; } +#ifdef CONFIG_COMPACTION /* Returns true if the pageblock should be scanned for pages to isolate. */ static inline bool isolation_suitable(struct compact_control *cc, struct page *page) @@ -107,6 +108,17 @@ static void update_pageblock_skip(struct page *page, unsigned long nr_isolated) if (!nr_isolated) set_pageblock_skip(page); } +#else +static inline bool isolation_suitable(struct compact_control *cc, + struct page *page) +{ + return true; +} + +static void update_pageblock_skip(struct page *page, unsigned long nr_isolated) +{ +} +#endif /* CONFIG_COMPACTION */ static inline bool should_release_lock(spinlock_t *lock) { -- 2.39.5