linux-kernel - [PATCH x86/urgent 1/2] x86: s/PAGES_PER_ELEMENT/PAGES_PER

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Date:	Fri, 1 Jul 2011 18:22:39 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Conny Seidel <conny.seidel@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Hans Rosenfeld <hans.rosenfeld@....com>
Subject: [PATCH x86/urgent 1/2] x86: s/PAGES_PER_ELEMENT/PAGES_PER_SECTION/

DISCONTIGMEM on x86-32 implements pfn -> nid mapping similarly to
SPARSEMEM; however, it calls each mapping unit ELEMENT instead of
SECTION.  This patch renames it to SECTION so that PAGES_PER_SECTION
is valid for both DISCONTIGMEM and SPARSEMEM.  This will be used by
the next patch to implement mapping granularity check.

This patch is trivial constant rename.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Hans Rosenfeld <hans.rosenfeld@....com>
---
 arch/x86/include/asm/mmzone_32.h |    6 +++---
 arch/x86/mm/numa_32.c            |    6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

Index: work/arch/x86/include/asm/mmzone_32.h
===================================================================
--- work.orig/arch/x86/include/asm/mmzone_32.h
+++ work/arch/x86/include/asm/mmzone_32.h
@@ -34,15 +34,15 @@ static inline void resume_map_numa_kva(p
  *    64Gb / 4096bytes/page = 16777216 pages
  */
 #define MAX_NR_PAGES 16777216
-#define MAX_ELEMENTS 1024
-#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
+#define MAX_SECTIONS 1024
+#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
 
 extern s8 physnode_map[];
 
 static inline int pfn_to_nid(unsigned long pfn)
 {
 #ifdef CONFIG_NUMA
-	return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
+	return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
 #else
 	return 0;
 #endif
Index: work/arch/x86/mm/numa_32.c
===================================================================
--- work.orig/arch/x86/mm/numa_32.c
+++ work/arch/x86/mm/numa_32.c
@@ -41,7 +41,7 @@
  *     physnode_map[16-31] = 1;
  *     physnode_map[32- ] = -1;
  */
-s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
+s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
 EXPORT_SYMBOL(physnode_map);
 
 void memory_present(int nid, unsigned long start, unsigned long end)
@@ -52,8 +52,8 @@ void memory_present(int nid, unsigned lo
 			nid, start, end);
 	printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
 	printk(KERN_DEBUG "  ");
-	for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
-		physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
+	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
+		physnode_map[pfn / PAGES_PER_SECTION] = nid;
 		printk(KERN_CONT "%lx ", pfn);
 	}
 	printk(KERN_CONT "\n");
--
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