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author | Rob Herring <rob.herring@calxeda.com> | 2013-11-07 10:34:46 -0600 |
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committer | Rob Herring <rob.herring@calxeda.com> | 2013-11-07 10:34:46 -0600 |
commit | b5480950c6cbb7b07ab1c1a5af0dc661a1cb6f24 (patch) | |
tree | b5fcb00387a838beb2bcf2f8ed2fd3d6d460c8ae /include/linux/balloon_compaction.h | |
parent | MIPS: Netlogic: replace early_init_devtree() call (diff) | |
parent | of/irq: Fix potential buffer overflow (diff) | |
download | linux-dev-b5480950c6cbb7b07ab1c1a5af0dc661a1cb6f24.tar.xz linux-dev-b5480950c6cbb7b07ab1c1a5af0dc661a1cb6f24.zip |
Merge remote-tracking branch 'grant/devicetree/next' into for-next
Diffstat (limited to 'include/linux/balloon_compaction.h')
-rw-r--r-- | include/linux/balloon_compaction.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h index f7f1d7169b11..089743ade734 100644 --- a/include/linux/balloon_compaction.h +++ b/include/linux/balloon_compaction.h @@ -159,6 +159,26 @@ static inline bool balloon_page_movable(struct page *page) } /* + * isolated_balloon_page - identify an isolated balloon page on private + * compaction/migration page lists. + * + * After a compaction thread isolates a balloon page for migration, it raises + * the page refcount to prevent concurrent compaction threads from re-isolating + * the same page. For that reason putback_movable_pages(), or other routines + * that need to identify isolated balloon pages on private pagelists, cannot + * rely on balloon_page_movable() to accomplish the task. + */ +static inline bool isolated_balloon_page(struct page *page) +{ + /* Already isolated balloon pages, by default, have a raised refcount */ + if (page_flags_cleared(page) && !page_mapped(page) && + page_count(page) >= 2) + return __is_movable_balloon_page(page); + + return false; +} + +/* * balloon_page_insert - insert a page into the balloon's page list and make * the page->mapping assignment accordingly. * @page : page to be assigned as a 'balloon page' @@ -243,6 +263,11 @@ static inline bool balloon_page_movable(struct page *page) return false; } +static inline bool isolated_balloon_page(struct page *page) +{ + return false; +} + static inline bool balloon_page_isolate(struct page *page) { return false; |