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mm: add fields for compound destructor and order into struct page

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Currently, we use lru.next/lru.prev plus cast to access or set
destructor and order of compound page.

Let's replace it with explicit fields in struct page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2015-02-11 15:24:46 -08:00
committed by Linus Torvalds
parent aa7ed01f93
commit e4b294c2d8
2 changed files with 12 additions and 5 deletions
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9
include/linux/mm.h
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@@ -627,29 +627,28 @@ int split_free_page(struct page *page);
* prototype for that function and accessor functions.
* These are _only_ valid on the head of a PG_compound page.
*/
typedef void compound_page_dtor(struct page *);
static inline void set_compound_page_dtor(struct page *page,
compound_page_dtor *dtor)
{
page[1].lru.next = (void *)dtor;
page[1].compound_dtor = dtor;
}
static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
{
return (compound_page_dtor *)page[1].lru.next;
return page[1].compound_dtor;
}
static inline int compound_order(struct page *page)
{
if (!PageHead(page))
return 0;
return (unsigned long)page[1].lru.prev;
return page[1].compound_order;
}
static inline void set_compound_order(struct page *page, unsigned long order)
{
page[1].lru.prev = (void *)order;
page[1].compound_order = order;
}
#ifdef CONFIG_MMU