From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
split_huge_page must transform a compound page to a regular page and needs
ClearPageCompound.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
---
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -347,7 +347,7 @@ static inline void set_page_writeback(st
* tests can be used in performance sensitive paths. PageCompound is
* generally not used in hot code paths.
*/
-__PAGEFLAG(Head, head)
+__PAGEFLAG(Head, head) CLEARPAGEFLAG(Head, head)
__PAGEFLAG(Tail, tail)
static inline int PageCompound(struct page *page)
@@ -355,6 +355,13 @@ static inline int PageCompound(struct pa
return page->flags & ((1L << PG_head) | (1L << PG_tail));
}
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline void ClearPageCompound(struct page *page)
+{
+ BUG_ON(!PageHead(page));
+ ClearPageHead(page);
+}
+#endif
#else
/*
* Reduce page flag use as much as possible by overlapping
@@ -392,6 +399,14 @@ static inline void __ClearPageTail(struc
page->flags &= ~PG_head_tail_mask;
}
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline void ClearPageCompound(struct page *page)
+{
+ BUG_ON((page->flags & PG_head_tail_mask) != (1 << PG_compound));
+ clear_bit(PG_compound, &page->flags);
+}
+#endif
+
#endif /* !PAGEFLAGS_EXTENDED */
#ifdef CONFIG_MMU
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