| Date | Mon, 10 Sep 2007 23:04:15 -0700 | From | Christoph Lameter <> | Subject | [25/41] compound pages: Allow use of get_page_unless_zero with compound pages |
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This is needed by slab defragmentation. The refcount of a page head may be incremented to ensure that a compound page will not go away under us.
It also may be needed for defragmentation of higher order pages. The moving of compound pages may require the establishment of a reference before the use of page migration functions.
Signed-off-by: Christoph Lameter <clameter@sgi.com> --- include/linux/mm.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 6f3a8d6..a8a0378 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -290,7 +290,7 @@ static inline int put_page_testzero(struct page *page) */ static inline int get_page_unless_zero(struct page *page) { - VM_BUG_ON(PageCompound(page)); + VM_BUG_ON(PageTail(page)); return atomic_inc_not_zero(&page->_count); } -- 1.5.2.5 -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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