diff options
| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2015-02-11 15:24:46 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-11 17:06:00 -0800 |
| commit | e4b294c2d8f73af4cd41ff30638ad0e4769dc56a (patch) | |
| tree | 180172b74fb439e1c4bdde668f141426bb001515 /include/linux/mm_types.h | |
| parent | Merge tag 'mmc-v3.20-1' of git://git.linaro.org/people/ulf.hansson/mmc (diff) | |
| download | wireguard-linux-e4b294c2d8f73af4cd41ff30638ad0e4769dc56a.tar.xz wireguard-linux-e4b294c2d8f73af4cd41ff30638ad0e4769dc56a.zip | |
mm: add fields for compound destructor and order into struct page
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>
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 07c8bd3f7b48..20ff2105b564 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -28,6 +28,8 @@ struct mem_cgroup; IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK)) #define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8) +typedef void compound_page_dtor(struct page *); + /* * Each physical page in the system has a struct page associated with * it to keep track of whatever it is we are using the page for at the @@ -142,6 +144,12 @@ struct page { struct rcu_head rcu_head; /* Used by SLAB * when destroying via RCU */ + /* First tail page of compound page */ + struct { + compound_page_dtor *compound_dtor; + unsigned long compound_order; + }; + #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && USE_SPLIT_PMD_PTLOCKS pgtable_t pmd_huge_pte; /* protected by page->ptl */ #endif |