Hi,

On (11/09/15 16:23), Joonsoo Kim wrote:
[..]

+static inline int page_count(struct page *page)
+{
+	return atomic_read(&compound_head(page)->_count);
+}
+
+static inline void set_page_count(struct page *page, int v)
+{
+	atomic_set(&page->_count, v);
+}
+
+/*
+ * Setup the page count before being freed into the page allocator for
+ * the first time (boot or memory hotplug)
+ */
+static inline void init_page_count(struct page *page)
+{
+	set_page_count(page, 1);
+}
+
+static inline void page_ref_add(struct page *page, int nr)
+{
+	atomic_add(nr, &page->_count);
+}

Since page_ref_FOO wrappers operate with page->_count and there
are already page_count()/set_page_count()/etc. may be name new
wrappers in page_count_FOO() manner?

+static inline void page_ref_sub(struct page *page, int nr)

for example, page_count_sub(), etc.

	-ss

+{
+	atomic_sub(nr, &page->_count);
+}
+
+static inline void page_ref_inc(struct page *page)
+{
+	atomic_inc(&page->_count);
+}
+
+static inline void page_ref_dec(struct page *page)
+{
+	atomic_dec(&page->_count);
+}
+
+static inline int page_ref_sub_and_test(struct page *page, int nr)
+{
+	return atomic_sub_and_test(nr, &page->_count);
+}
+
+static inline int page_ref_dec_and_test(struct page *page)
+{
+	return atomic_dec_and_test(&page->_count);
+}
+
+static inline int page_ref_dec_return(struct page *page)
+{
+	return atomic_dec_return(&page->_count);
+}
+
+static inline int page_ref_add_unless(struct page *page, int nr, int u)
+{
+	return atomic_add_unless(&page->_count, nr, u);
+}
+
+static inline int page_ref_freeze(struct page *page, int count)
+{
+	return likely(atomic_cmpxchg(&page->_count, count, 0) == count);
+}
+
+static inline void page_ref_unfreeze(struct page *page, int count)
+{
+	VM_BUG_ON_PAGE(page_count(page) != 0, page);
+	VM_BUG_ON(count == 0);
+
+	atomic_set(&page->_count, count);
+}

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