linux-kernel - [PATCHv4 21/43] thp: introduce hpage_size() and hpage

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Message-Id: <20161025001342.76126-22-kirill.shutemov@linux.intel.com>
Date:   Tue, 25 Oct 2016 03:13:20 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-block@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv4 21/43] thp: introduce hpage_size() and hpage_mask()

Introduce new helpers which return size/mask of the page:
HPAGE_PMD_SIZE/HPAGE_PMD_MASK if the page is PageTransHuge() and
PAGE_SIZE/PAGE_MASK otherwise.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/huge_mm.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 9b9f65d99873..42934769f256 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -142,6 +142,20 @@ static inline int hpage_nr_pages(struct page *page)
 	return 1;
 }
 
+static inline int hpage_size(struct page *page)
+{
+	if (unlikely(PageTransHuge(page)))
+		return HPAGE_PMD_SIZE;
+	return PAGE_SIZE;
+}
+
+static inline unsigned long hpage_mask(struct page *page)
+{
+	if (unlikely(PageTransHuge(page)))
+		return HPAGE_PMD_MASK;
+	return PAGE_MASK;
+}
+
 extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
 
 extern struct page *huge_zero_page;
@@ -167,6 +181,8 @@ void mm_put_huge_zero_page(struct mm_struct *mm);
 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 
 #define hpage_nr_pages(x) 1
+#define hpage_size(x) PAGE_SIZE
+#define hpage_mask(x) PAGE_MASK
 
 #define transparent_hugepage_enabled(__vma) 0
 
-- 
2.9.3