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authorAndy Whitcroft <apw@shadowen.org>2006-12-06 23:33:32 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 11:39:25 -0500
commit33f2ef89f8e181486b63fdbdc97c6afa6ca9f34b (patch)
treeb90eac24ff367bc628c44eaa51a9f0ea1b69d1a4 /mm/swap.c
parent3c517a6132098ca37e122a2980fc64a9e798b0d7 (diff)
[PATCH] mm: make compound page destructor handling explicit
Currently we we use the lru head link of the second page of a compound page to hold its destructor. This was ok when it was purely an internal implmentation detail. However, hugetlbfs overrides this destructor violating the layering. Abstract this out as explicit calls, also introduce a type for the callback function allowing them to be type checked. For each callback we pre-declare the function, causing a type error on definition rather than on use elsewhere. [akpm@osdl.org: cleanups] Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/swap.c b/mm/swap.c
index d9a3770d8f3c..017e72ca9bbb 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -57,9 +57,9 @@ static void put_compound_page(struct page *page)
57{ 57{
58 page = (struct page *)page_private(page); 58 page = (struct page *)page_private(page);
59 if (put_page_testzero(page)) { 59 if (put_page_testzero(page)) {
60 void (*dtor)(struct page *page); 60 compound_page_dtor *dtor;
61 61
62 dtor = (void (*)(struct page *))page[1].lru.next; 62 dtor = get_compound_page_dtor(page);
63 (*dtor)(page); 63 (*dtor)(page);
64 } 64 }
65} 65}