linux-kernel - [PATCH 2/2] mm: use pgdat_end_pfn() to simplify the code in others

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Date:	Thu, 5 Sep 2013 16:07:06 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
CC:	<linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Xishi Qiu <qiuxishi@...wei.com>
Subject: [PATCH 2/2] mm: use pgdat_end_pfn() to simplify the code in others

Use "pgdat_end_pfn()" instead of "pgdat->node_start_pfn + pgdat->node_spanned_pages".
Simplify the code, no functional change.

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 fs/proc/kcore.c     |    3 +--
 mm/bootmem.c        |    2 +-
 mm/memory_hotplug.c |    9 ++++-----
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 06ea155..a5b4412 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -255,8 +255,7 @@ static int kcore_update_ram(void)
 	end_pfn = 0;
 	for_each_node_state(nid, N_MEMORY) {
 		unsigned long node_end;
-		node_end  = NODE_DATA(nid)->node_start_pfn +
-			NODE_DATA(nid)->node_spanned_pages;
+		node_end = node_end_pfn(nid);
 		if (end_pfn < node_end)
 			end_pfn = node_end;
 	}
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 6ab7744..95b528c 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -784,7 +784,7 @@ void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 
 	/* update goal according ...MAX_DMA32_PFN */
-	end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
+	end_pfn = pgdat_end_pfn(pgdat);
 
 	if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 	    (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index ca1dd3a..0ca2c8d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -368,8 +368,7 @@ out_fail:
 static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
 			    unsigned long end_pfn)
 {
-	unsigned long old_pgdat_end_pfn =
-		pgdat->node_start_pfn + pgdat->node_spanned_pages;
+	unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat);
 
 	if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn)
 		pgdat->node_start_pfn = start_pfn;
@@ -581,9 +580,9 @@ static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
 static void shrink_pgdat_span(struct pglist_data *pgdat,
 			      unsigned long start_pfn, unsigned long end_pfn)
 {
-	unsigned long pgdat_start_pfn =  pgdat->node_start_pfn;
-	unsigned long pgdat_end_pfn =
-		pgdat->node_start_pfn + pgdat->node_spanned_pages;
+	unsigned long pgdat_start_pfn = pgdat->node_start_pfn;
+	unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */
+	unsigned long pgdat_end_pfn = p;
 	unsigned long pfn;
 	struct mem_section *ms;
 	int nid = pgdat->node_id;
-- 
1.7.1


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