linux-kernel - [PATCH v4 05/36] mm: Introduce thp

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Date:   Fri, 15 May 2020 06:16:25 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 05/36] mm: Introduce thp_order

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

Like compound_order() except 0 when THP is disabled.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/huge_mm.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index e944f9757349..1f6245091917 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -276,6 +276,11 @@ static inline unsigned long thp_size(struct page *page)
 	return page_size(page);
 }
 
+static inline unsigned int thp_order(struct page *page)
+{
+	return compound_order(page);
+}
+
 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
 		pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
@@ -335,6 +340,7 @@ static inline int hpage_nr_pages(struct page *page)
 }
 
 #define thp_size(x)		PAGE_SIZE
+#define thp_order(x)		0U
 
 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
 {
-- 
2.26.2