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Commit fc437044 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Linus Torvalds
Browse files

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: default avatarMatthew Wilcox <willy@linux.intel.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b96375f7

include/linux/huge_mm.h

+10 −0
Original line number Diff line number Diff line
@@ -155,6 +155,16 @@ static inline bool is_huge_zero_page(struct page *page) 
	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; })

mm/huge_memory.c

+1 −6
Original line number Diff line number Diff line
@@ -173,12 +173,7 @@ static int start_stop_khugepaged(void) 
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: