The patch titled
Subject: mm: add thp_head
has been added to the -mm tree. Its filename is
mm-add-thp_head.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-thp_head.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-thp_head.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: add thp_head
This is like compound_head() but compiles away when
CONFIG_TRANSPARENT_HUGEPAGE is not enabled.
Link: http://lkml.kernel.org/r/20200629151959.15779-7-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/huge_mm.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/include/linux/huge_mm.h~mm-add-thp_head
+++ a/include/linux/huge_mm.h
@@ -260,6 +260,15 @@ static inline spinlock_t *pud_trans_huge
}
/**
+ * thp_head - Head page of a transparent huge page.
+ * @page: Any page (tail, head or regular) found in the page cache.
+ */
+static inline struct page *thp_head(struct page *page)
+{
+ return compound_head(page);
+}
+
+/**
* thp_order - Order of a transparent huge page.
* @page: Head page of a transparent huge page.
*/
@@ -335,6 +344,12 @@ static inline struct list_head *page_def
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
+static inline struct page *thp_head(struct page *page)
+{
+ VM_BUG_ON_PGFLAGS(PageTail(page), page);
+ return page;
+}
+
static inline unsigned int thp_order(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
vmalloc-convert-to-xarray.patch
mm-store-compound_nr-as-well-as-compound_order.patch
mm-move-page-flags-include-to-top-of-file.patch
mm-add-thp_order.patch
mm-add-thp_size.patch
mm-replace-hpage_nr_pages-with-thp_nr_pages.patch
mm-add-thp_head.patch
mm-introduce-offset_in_thp.patch
