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From: Wei Yang <richard.weiyang@gmail.com>
Subject: [RFC PATCH 2/4] mm/hotplug: walk_memroy_range on memory_block uit
Date: Sun, 25 Jun 2017 10:52:25 +0800
Message-Id: <20170625025227.45665-3-richard.weiyang@gmail.com>
In-Reply-To: <20170625025227.45665-1-richard.weiyang@gmail.com>
References: <20170625025227.45665-1-richard.weiyang@gmail.com>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: mhocko@suse.com, linux-mm@kvack.org
Cc: Wei Yang <richard.weiyang@gmail.com>

hotplug memory range is memory_block aligned and walk_memroy_range guarded
with check_hotplug_memory_range(). This is save to iterate on the
memory_block base.

This patch adjust the iteration unit and assume there is not hole in
hotplug memory range.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
 mm/memory_hotplug.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index f5d06afc8645..a79a83ec965f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1858,17 +1858,11 @@ int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
 	unsigned long pfn, section_nr;
 	int ret;
 
-	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
+	for (pfn = start_pfn; pfn < end_pfn;
+		pfn += PAGES_PER_SECTION * sections_per_block) {
 		section_nr = pfn_to_section_nr(pfn);
-		if (!present_section_nr(section_nr))
-			continue;
 
 		section = __nr_to_section(section_nr);
-		/* same memblock? */
-		if (mem)
-			if ((section_nr >= mem->start_section_nr) &&
-			    (section_nr <= mem->end_section_nr))
-				continue;
 
 		mem = find_memory_block_hinted(section, mem);
 		if (!mem)
-- 
2.11.0

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