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-rw-r--r--mm/sparse.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index 5398d48..08f0532 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -249,11 +249,22 @@ static unsigned long *__kmalloc_section_usemap(void)
static unsigned long *__init sparse_early_usemap_alloc(unsigned long pnum)
{
- unsigned long *usemap;
+ unsigned long *usemap, section_nr;
struct mem_section *ms = __nr_to_section(pnum);
int nid = sparse_early_nid(ms);
+ struct pglist_data *pgdat = NODE_DATA(nid);
- usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size());
+ /*
+ * Usemap's page can't be freed until freeing other sections
+ * which use it. And, Pgdat has same feature.
+ * If section A has pgdat and section B has usemap for other
+ * sections (includes section A), both sections can't be removed,
+ * because there is the dependency each other.
+ * To solve above issue, this collects all usemap on the same section
+ * which has pgdat.
+ */
+ section_nr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
+ usemap = alloc_bootmem_section(usemap_size(), section_nr);
if (usemap)
return usemap;
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