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Subject[PATCH] MM: Fix macro argument substitution in PageHead() and PageTail()
Date
From: David Howells <dhowells@redhat.com>

Fix macro argument substitution in PageHead() and PageTail() - 'page' should
have brackets surrounding it (commit 6d7779538f765963ced45a3fa4bed7ba8d2c277d).

Signed-off-by: David Howells <dhowells@redhat.com>
---

include/linux/page-flags.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)


diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index bbad43f..b5b30f1 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -266,7 +266,7 @@ static inline void SetPageUptodate(struct page *page)

#define PG_head_tail_mask ((1L << PG_compound) | (1L << PG_reclaim))

-#define PageTail(page) ((page->flags & PG_head_tail_mask) \
+#define PageTail(page) (((page)->flags & PG_head_tail_mask) \
== PG_head_tail_mask)

static inline void __SetPageTail(struct page *page)
@@ -279,7 +279,7 @@ static inline void __ClearPageTail(struct page *page)
page->flags &= ~PG_head_tail_mask;
}

-#define PageHead(page) ((page->flags & PG_head_tail_mask) \
+#define PageHead(page) (((page)->flags & PG_head_tail_mask) \
== (1L << PG_compound))
#define __SetPageHead(page) __SetPageCompound(page)
#define __ClearPageHead(page) __ClearPageCompound(page)


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