linux-kernel - [PATCH 2/3] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN

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Message-ID: <20110328092412.GC13826@router-fw-old.local.net-space.pl>
Date:	Mon, 28 Mar 2011 11:24:12 +0200
From:	Daniel Kiper <dkiper@...-space.pl>
To:	ian.campbell@...rix.com, akpm@...ux-foundation.org,
	andi.kleen@...el.com, haicheng.li@...ux.intel.com,
	fengguang.wu@...el.com, jeremy@...p.org, konrad.wilk@...cle.com,
	dan.magenheimer@...cle.com, v.tolstov@...fip.ru, pasik@....fi,
	dave@...ux.vnet.ibm.com, wdauchy@...il.com, rientjes@...gle.com,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 2/3] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro

Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro which aligns
given pfn to upper section and lower section boundary accordingly.

Signed-off-by: Daniel Kiper <dkiper@...-space.pl>
---
 include/linux/mmzone.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 02ecb01..d342820 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -931,6 +931,9 @@ static inline unsigned long early_pfn_to_nid(unsigned long pfn)
 #define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT)
 #define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT)
 
+#define SECTION_ALIGN_UP(pfn)	(((pfn) + PAGES_PER_SECTION - 1) & PAGE_SECTION_MASK)
+#define SECTION_ALIGN_DOWN(pfn)	((pfn) & PAGE_SECTION_MASK)
+
 #ifdef CONFIG_SPARSEMEM
 
 /*
-- 
1.5.6.5
--
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