This will make sure number of sections marked as present won't be changed
in sparse_init(), so that for_each_present_section_nr() can iterate
each of them. This is preparation for later fix.
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
---
mm/sparse-vmemmap.c | 1 -
mm/sparse.c | 15 ++++++++++++---
2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 17acf01791fa..315bea91e276 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -324,7 +324,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
ms = __nr_to_section(pnum);
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__);
- ms->section_mem_map = 0;
}
if (vmemmap_buf_start) {
diff --git a/mm/sparse.c b/mm/sparse.c
index 2609aba121e8..54eba92b72a1 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -478,7 +478,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
ms = __nr_to_section(pnum);
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__);
- ms->section_mem_map = 0;
}
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
@@ -610,17 +609,27 @@ void __init sparse_init(void)
#endif
for_each_present_section_nr(0, pnum) {
+ struct mem_section *ms;
+ ms = __nr_to_section(pnum);
usemap = usemap_map[pnum];
- if (!usemap)
+ if (!usemap) {
+#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+ ms->section_mem_map = 0;
+#endif
continue;
+ }
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
map = map_map[pnum];
#else
map = sparse_early_mem_map_alloc(pnum);
#endif
- if (!map)
+ if (!map) {
+#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
+ ms->section_mem_map = 0;
+#endif
continue;
+ }
sparse_init_one_section(__nr_to_section(pnum), pnum, map,
usemap);
--
2.13.6
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