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-rw-r--r--include/linux/cma.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/cma.h b/include/linux/cma.h
index bd801023504b..90fd742fd1ef 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -20,6 +20,14 @@
#define CMA_MAX_NAME 64
+/*
+ * TODO: once the buddy -- especially pageblock merging and alloc_contig_range()
+ * -- can deal with only some pageblocks of a higher-order page being
+ * MIGRATE_CMA, we can use pageblock_nr_pages.
+ */
+#define CMA_MIN_ALIGNMENT_PAGES MAX_ORDER_NR_PAGES
+#define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
+
struct cma;
extern unsigned long totalcma_pages;
@@ -50,4 +58,6 @@ extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned
extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
+
+extern void cma_reserve_pages_on_error(struct cma *cma);
#endif