linux-kernel - [PATCH 08/17] mm/page_alloc: use zone_spans

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Message-Id: <1358295894-24167-9-git-send-email-cody@linux.vnet.ibm.com>
Date:	Tue, 15 Jan 2013 16:24:45 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Cody P Schafer <jmesmon@...il.com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 08/17] mm/page_alloc: use zone_spans_pfn() instead of open coded checks.

From: Cody P Schafer <jmesmon@...il.com>

In 2 VM_BUG()s, avoid open coding zone ownership of pfns.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 mm/page_alloc.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3911c1a..c5d70ce 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -242,9 +242,7 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
 
 	do {
 		seq = zone_span_seqbegin(zone);
-		if (pfn >= zone->zone_start_pfn + zone->spanned_pages)
-			ret = 1;
-		else if (pfn < zone->zone_start_pfn)
+		if (!zone_spans_pfn(zone, pfn))
 			ret = 1;
 	} while (zone_span_seqretry(zone, seq));
 
@@ -5639,8 +5637,7 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags,
 	pfn = page_to_pfn(page);
 	bitmap = get_pageblock_bitmap(zone, pfn);
 	bitidx = pfn_to_bitidx(zone, pfn);
-	VM_BUG_ON(pfn < zone->zone_start_pfn);
-	VM_BUG_ON(pfn >= zone->zone_start_pfn + zone->spanned_pages);
+	VM_BUG_ON(!zone_spans_pfn(zone, pfn));
 
 	for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
 		if (flags & value)
-- 
1.8.0.3

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