linux-kernel - [PATCH 3/9] mm: add zone_is_empty() and zone_is

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Date:	Thu, 17 Jan 2013 14:52:55 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>,
	David Hansen <dave@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 3/9] mm: add zone_is_empty() and zone_is_initialized()

Factoring out these 2 checks makes it more clear what we are actually
checking for.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 include/linux/mmzone.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d91d964..696cb7c 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -553,6 +553,16 @@ static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn)
 	return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone);
 }
 
+static inline bool zone_is_initialized(struct zone *zone)
+{
+	return !!zone->wait_table;
+}
+
+static inline bool zone_is_empty(struct zone *zone)
+{
+	return zone->spanned_pages == 0;
+}
+
 /*
  * The "priority" of VM scanning is how much of the queues we will scan in one
  * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the
-- 
1.8.0.3

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