[PATCH] clear the memory to store page information

[Wen Congyang]

---
 mm/sparse.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index ab9d755..36dda08 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -639,7 +639,6 @@ static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
 got_map_page:
 	ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
 got_map_ptr:
-	memset(ret, 0, memmap_size);
 
 	return ret;
 }
@@ -761,6 +760,8 @@ int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 		goto out;
 	}
 
+	memset(memmap, 0, sizeof(struct page) * nr_pages);
+
 	ms->section_mem_map |= SECTION_MARKED_PRESENT;
 
 	ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
-- 
1.7.1

Thanks
Wen Congyang

> 
> thanks,
> 
> - Vasilis
> 
> [1] https://lkml.org/lkml/2012/9/6/635
> [2] https://lkml.org/lkml/2012/9/11/542
> [3] https://lkml.org/lkml/2012/9/20/37
> [4] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/98691
> 
> 
> 

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