[RFC PATCH 2/4] mm/hotplug: walk_memroy_range on memory_block uit
From: Wei Yang <hidden>
Date: 2017-06-25 02:53:21
Subsystem:
memory hot(un)plug, memory management, the rest · Maintainers:
David Hildenbrand, Oscar Salvador, Andrew Morton, Linus Torvalds
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 <redacted> --- 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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