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From: Daniel Kiper <dkiper@net-space.pl>
To: ian.campbell@citrix.com, akpm@linux-foundation.org,
	andi.kleen@intel.com, haicheng.li@linux.intel.com,
	fengguang.wu@intel.com, jeremy@goop.org, konrad.wilk@oracle.com,
	dan.magenheimer
Subject: [PATCH V3 1/2] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro
Date: Tue, 17 May 2011 23:37:50 +0200	[thread overview]
Message-ID: <20110517213750.GB30232__45171.1875656203$1305668324$gmane$org@router-fw-old.local.net-space.pl> (raw)

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@net-space.pl>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 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 d715200..217bcf6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -956,6 +956,9 @@ 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)
+
 struct page;
 struct page_cgroup;
 struct mem_section {
-- 
1.5.6.5

             reply	other threads:[~2011-05-17 21:37 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-17 21:37 Daniel Kiper [this message]
2011-05-17 21:37 [PATCH V3 1/2] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro Daniel Kiper
2011-05-17 21:37 ` Daniel Kiper
2011-05-19  3:21 ` David Rientjes
2011-05-19  3:21   ` David Rientjes
2011-05-19 19:56   ` Daniel Kiper
2011-05-19 19:56     ` Daniel Kiper

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