The patch titled
Subject: mm: export various functions for the benefit of DAX
has been added to the -mm tree. Its filename is
mm-export-various-functions-for-the-benefit-of-dax.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-export-various-functions-for-the-benefit-of-dax.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-export-various-functions-for-the-benefit-of-dax.patch
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------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Subject: mm: export various functions for the benefit of DAX
To use the huge zero page in DAX, we need these functions exported.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Hillf Danton <dhillf@xxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/huge_mm.h | 10 ++++++++++
mm/huge_memory.c | 7 +------
2 files changed, 11 insertions(+), 6 deletions(-)
diff -puN include/linux/huge_mm.h~mm-export-various-functions-for-the-benefit-of-dax include/linux/huge_mm.h
--- a/include/linux/huge_mm.h~mm-export-various-functions-for-the-benefit-of-dax
+++ a/include/linux/huge_mm.h
@@ -155,6 +155,16 @@ static inline bool is_huge_zero_page(str
return ACCESS_ONCE(huge_zero_page) == page;
}
+static inline bool is_huge_zero_pmd(pmd_t pmd)
+{
+ return is_huge_zero_page(pmd_page(pmd));
+}
+
+struct page *get_huge_zero_page(void);
+bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
+ struct vm_area_struct *vma, unsigned long haddr,
+ pmd_t *pmd, struct page *zero_page);
+
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
diff -puN mm/huge_memory.c~mm-export-various-functions-for-the-benefit-of-dax mm/huge_memory.c
--- a/mm/huge_memory.c~mm-export-various-functions-for-the-benefit-of-dax
+++ a/mm/huge_memory.c
@@ -172,12 +172,7 @@ fail:
static atomic_t huge_zero_refcount;
struct page *huge_zero_page __read_mostly;
-static inline bool is_huge_zero_pmd(pmd_t pmd)
-{
- return is_huge_zero_page(pmd_page(pmd));
-}
-
-static struct page *get_huge_zero_page(void)
+struct page *get_huge_zero_page(void)
{
struct page *zero_page;
retry:
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxxxx are
mm-make-gup-handle-pfn-mapping-unless-foll_get-is-requested.patch
dax-move-dax-related-functions-to-a-new-header.patch
thp-prepare-for-dax-huge-pages.patch
mm-add-a-pmd_fault-handler.patch
mm-export-various-functions-for-the-benefit-of-dax.patch
mm-add-vmf_insert_pfn_pmd.patch
dax-add-huge-page-fault-support.patch
ext2-huge-page-fault-support.patch
ext4-huge-page-fault-support.patch
xfs-huge-page-fault-support.patch
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