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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-01-16 03:51:17 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-16 04:56:32 +0300
commit0e6d31a7336f41ef0375f5398c79e54de8e219b6 (patch)
treeeb716f43a4a5d24413b8fae8fc73e73760177200 /include/linux/page-flags.h
parentd8c1bdeb5d6b62b34a78391206a5e55e4a02d58f (diff)
downloadlinux-0e6d31a7336f41ef0375f5398c79e54de8e219b6.tar.xz
page-flags: move code around
The preparation patch: we are going to use compound_head(), PageTail() and PageCompound() to define page-flags helpers. Let's define them before macros. We cannot user PageHead() helper in PageCompound() as it's not yet defined -- use test_bit(PG_head, &page->flags) instead. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Steve Capper <steve.capper@linaro.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Jérôme Glisse <jglisse@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/page-flags.h')
-rw-r--r--include/linux/page-flags.h41
1 files changed, 21 insertions, 20 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 45792d01edea..83161a22509c 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -133,6 +133,27 @@ enum pageflags {
#ifndef __GENERATING_BOUNDS_H
+struct page; /* forward declaration */
+
+static inline struct page *compound_head(struct page *page)
+{
+ unsigned long head = READ_ONCE(page->compound_head);
+
+ if (unlikely(head & 1))
+ return (struct page *) (head - 1);
+ return page;
+}
+
+static inline int PageTail(struct page *page)
+{
+ return READ_ONCE(page->compound_head) & 1;
+}
+
+static inline int PageCompound(struct page *page)
+{
+ return test_bit(PG_head, &page->flags) || PageTail(page);
+}
+
/*
* Macros to create function definitions for page flags
*/
@@ -204,7 +225,6 @@ static inline int __TestClearPage##uname(struct page *page) { return 0; }
#define TESTSCFLAG_FALSE(uname) \
TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname)
-struct page; /* forward declaration */
TESTPAGEFLAG(Locked, locked)
PAGEFLAG(Error, error) TESTCLEARFLAG(Error, error)
@@ -395,11 +415,6 @@ static inline void set_page_writeback_keepwrite(struct page *page)
__PAGEFLAG(Head, head) CLEARPAGEFLAG(Head, head)
-static inline int PageTail(struct page *page)
-{
- return READ_ONCE(page->compound_head) & 1;
-}
-
static inline void set_compound_head(struct page *page, struct page *head)
{
WRITE_ONCE(page->compound_head, (unsigned long)head + 1);
@@ -410,20 +425,6 @@ static inline void clear_compound_head(struct page *page)
WRITE_ONCE(page->compound_head, 0);
}
-static inline struct page *compound_head(struct page *page)
-{
- unsigned long head = READ_ONCE(page->compound_head);
-
- if (unlikely(head & 1))
- return (struct page *) (head - 1);
- return page;
-}
-
-static inline int PageCompound(struct page *page)
-{
- return PageHead(page) || PageTail(page);
-
-}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline void ClearPageCompound(struct page *page)
{