From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Returns true if mapping can have huge pages. Just check for __GFP_COMP
in gfp mask of the mapping for now.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e3dea75..28597ec 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -84,6 +84,18 @@ static inline void mapping_set_gfp_mask(struct address_space *m, gfp_t mask)
(__force unsigned long)mask;
}
+static inline bool mapping_can_have_hugepages(struct address_space *m)
+{
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE_PAGECACHE)) {
+ gfp_t gfp_mask = mapping_gfp_mask(m);
+ /* __GFP_COMP is key part of GFP_TRANSHUGE */
+ return !!(gfp_mask & __GFP_COMP) &&
+ transparent_hugepage_pagecache();
+ }
+
+ return false;
+}
+
/*
* The page cache can done in larger chunks than
* one page, because it allows for more efficient
--
1.7.10.4
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