linux-kernel - [PATCH] mm: Remove zone_id() and make use of zone_idx() in is_dev

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Message-Id: <20180730133718.28683-1-osalvador@techadventures.net>
Date:   Mon, 30 Jul 2018 15:37:18 +0200
From:   osalvador@...hadventures.net
To:     akpm@...ux-foundation.org
Cc:     mhocko@...e.com, vbabka@...e.cz, sfr@...b.auug.org.au,
        rientjes@...gle.com, pasha.tatashin@...cle.com,
        kemi.wang@...el.com, jia.he@...-semitech.com, ptesarik@...e.com,
        aryabinin@...tuozzo.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, dan.j.williams@...el.com,
        Oscar Salvador <osalvador@...e.de>
Subject: [PATCH] mm: Remove zone_id() and make use of zone_idx() in is_dev_zone()

From: Oscar Salvador <osalvador@...e.de>

is_dev_zone() is using zone_id() to check if the zone is ZONE_DEVICE.
zone_id() looks pretty much the same as zone_idx(), and while the use of
zone_idx() is quite spread in the kernel, zone_id() is only being
used by is_dev_zone().

This patch removes zone_id() and makes is_dev_zone() use zone_idx()
to check the zone, so we do not have two things with the same
functionality around.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
 include/linux/mmzone.h | 31 ++++++++++++-------------------
 1 file changed, 12 insertions(+), 19 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 83b1d11e90eb..dbe7635c33dd 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -755,25 +755,6 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat)
 	return !pgdat->node_start_pfn && !pgdat->node_spanned_pages;
 }
 
-static inline int zone_id(const struct zone *zone)
-{
-	struct pglist_data *pgdat = zone->zone_pgdat;
-
-	return zone - pgdat->node_zones;
-}
-
-#ifdef CONFIG_ZONE_DEVICE
-static inline bool is_dev_zone(const struct zone *zone)
-{
-	return zone_id(zone) == ZONE_DEVICE;
-}
-#else
-static inline bool is_dev_zone(const struct zone *zone)
-{
-	return false;
-}
-#endif
-
 #include <linux/memory_hotplug.h>
 
 void build_all_zonelists(pg_data_t *pgdat);
@@ -824,6 +805,18 @@ static inline int local_memory_node(int node_id) { return node_id; };
  */
 #define zone_idx(zone)		((zone) - (zone)->zone_pgdat->node_zones)
 
+#ifdef CONFIG_ZONE_DEVICE
+static inline bool is_dev_zone(const struct zone *zone)
+{
+	return zone_idx(zone) == ZONE_DEVICE;
+}
+#else
+static inline bool is_dev_zone(const struct zone *zone)
+{
+	return false;
+}
+#endif
+
 /*
  * Returns true if a zone has pages managed by the buddy allocator.
  * All the reclaim decisions have to use this function rather than
-- 
2.13.6