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Subject[PATCH] mm/spase: never partially remove memmap for early section
Date
For early sections, we assumes its memmap will never be partially
removed. But current behavior breaks this.

Let's correct it.

Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
---
mm/sparse.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index b2b9a3e34696..1a0069f492f5 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -825,10 +825,10 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
ms->section_mem_map &= ~SECTION_HAS_MEM_MAP;
}

- if (section_is_early && memmap)
- free_map_bootmem(memmap);
- else
+ if (!section_is_early)
depopulate_section_memmap(pfn, nr_pages, altmap);
+ else if (memmap)
+ free_map_bootmem(memmap);

if (empty)
ms->section_mem_map = (unsigned long)NULL;
--
2.20.1 (Apple Git-117)
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