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authorVladimir Davydov <vdavydov@virtuozzo.com>2016-01-15 16:54:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 17:56:32 -0800
commit8749cfea11f3fffe8f7cad891470a77b36e0185f (patch)
tree1dc712f15e259ba4ff9c0ec62134440b28e89666 /include/linux/rmap.h
parentd965432234db94ee8e185f8fd8e3181bed7459fd (diff)
mm: add page_check_address_transhuge() helper
page_referenced_one() and page_idle_clear_pte_refs_one() duplicate the code for looking up pte of a (possibly transhuge) page. Move this code to a new helper function, page_check_address_transhuge(), and make the above mentioned functions use it. This is just a cleanup, no functional changes are intended. Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/rmap.h')
-rw-r--r--include/linux/rmap.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index ebf3750e42b2..77d1ba57d495 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -216,6 +216,25 @@ static inline pte_t *page_check_address(struct page *page, struct mm_struct *mm,
}
/*
+ * Used by idle page tracking to check if a page was referenced via page
+ * tables.
+ */
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+bool page_check_address_transhuge(struct page *page, struct mm_struct *mm,
+ unsigned long address, pmd_t **pmdp,
+ pte_t **ptep, spinlock_t **ptlp);
+#else
+static inline bool page_check_address_transhuge(struct page *page,
+ struct mm_struct *mm, unsigned long address,
+ pmd_t **pmdp, pte_t **ptep, spinlock_t **ptlp)
+{
+ *ptep = page_check_address(page, mm, address, ptlp, 0);
+ *pmdp = NULL;
+ return !!*ptep;
+}
+#endif
+
+/*
* Used by swapoff to help locate where page is expected in vma.
*/
unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);