aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-08-14 17:30:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-14 19:56:56 -0700
commit2be1d71841b7ecfb01ce4c59f6e1d082c3c18a8a (patch)
tree634b35d83ad5d2c7e439271dd42ee6f197d0df2d
parent6c357848b44b4016ca422178aa368a7472245f6f (diff)
downloadlinux-stericsson-2be1d71841b7ecfb01ce4c59f6e1d082c3c18a8a.tar.gz
mm: add thp_head
This is like compound_head() but compiles away when CONFIG_TRANSPARENT_HUGEPAGE is not enabled. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Zi Yan <ziy@nvidia.com> Cc: David Hildenbrand <david@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Link: http://lkml.kernel.org/r/20200629151959.15779-7-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/huge_mm.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 229f986d535a..8a8bc46a2432 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -260,6 +260,15 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
}
/**
+ * 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_deferred_list(struct page *page)
#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);