linux-kernel - [PATCH 1/1] mm/page_ref: introduce page_ref_inc

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Message-Id: <1466419093-114348-2-git-send-email-borntraeger@de.ibm.com>
Date:	Mon, 20 Jun 2016 12:38:13 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	KVM <kvm@...r.kernel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 1/1] mm/page_ref: introduce page_ref_inc_return

From: David Hildenbrand <dahi@...ux.vnet.ibm.com>

Let's introduce that helper.

Signed-off-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
---
 include/linux/page_ref.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index 8b5e0a9..610e132 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -124,6 +124,15 @@ static inline int page_ref_sub_and_test(struct page *page, int nr)
 	return ret;
 }
 
+static inline int page_ref_inc_return(struct page *page)
+{
+	int ret = atomic_inc_return(&page->_refcount);
+
+	if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return))
+		__page_ref_mod_and_return(page, 1, ret);
+	return ret;
+}
+
 static inline int page_ref_dec_and_test(struct page *page)
 {
 	int ret = atomic_dec_and_test(&page->_refcount);
-- 
2.5.5