Memory-hotplug codes for x86_64 have been implemented by patchset:
https://lkml.org/lkml/2013/1/9/124
While other platforms haven't been completely implemented yet.
If we enable both CONFIG_MEMORY_HOTPLUG_SPARSE and CONFIG_SPARSEMEM_VMEMMAP,
register_page_bootmem_info_node() may be buggy, which is a hotplug generic
function but falling back to call platform related function
register_page_bootmem_memmap().
Other platforms such as powerpc it's not implemented, so on such platforms,
revert them as empty as they were before.
Reported-by: Michal Hocko <mho...@suse.cz>
Signed-off-by: Lin Feng <linf...@cn.fujitsu.com>
---
mm/memory_hotplug.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 8aa2b56..bd93c2e 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -189,6 +189,7 @@ static void register_page_bootmem_info_section(unsigned
long start_pfn)
}
#endif
+#ifdef CONFIG_X86_64
void register_page_bootmem_info_node(struct pglist_data *pgdat)
{
unsigned long i, pfn, end_pfn, nr_pages;
@@ -230,6 +231,14 @@ void register_page_bootmem_info_node(struct pglist_data
*pgdat)
register_page_bootmem_info_section(pfn);
}
}
+#else
+static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
+{
+ /*
+ * Todo: platforms other than X86_64 haven't been implemented yet.
+ */
+}
+#endif
static void grow_zone_span(struct zone *zone, unsigned long start_pfn,
unsigned long end_pfn)
--
1.7.1
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