The patch titled
enable booting a NUMA system where some nodes have no memory
has been added to the -mm tree. Its filename is
enables-booting-a-numa-system-where-some-nodes-have-no.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: enable booting a NUMA system where some nodes have no memory
From: Christian Krafft <krafft@xxxxxxxxxx>
When booting a NUMA system with nodes that have no memory (eg by limiting
memory), bootmem_alloc_core tried to find pages in an uninitialized
bootmem_map. This caused a null pointer access. This fix adds a check, so
that NULL is returned. That will enable the caller (bootmem_alloc_nopanic)
to alloc memory on other without a panic.
Signed-off-by: Christian Krafft <krafft@xxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Cc: Martin Bligh <mbligh@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/bootmem.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/bootmem.c~enables-booting-a-numa-system-where-some-nodes-have-no mm/bootmem.c
--- a/mm/bootmem.c~enables-booting-a-numa-system-where-some-nodes-have-no
+++ a/mm/bootmem.c
@@ -196,6 +196,10 @@ __alloc_bootmem_core(struct bootmem_data
if (limit && bdata->node_boot_start >= limit)
return NULL;
+ /* on nodes without memory - bootmem_map is NULL */
+ if (!bdata->node_bootmem_map)
+ return NULL;
+
end_pfn = bdata->node_low_pfn;
limit = PFN_DOWN(limit);
if (limit && end_pfn > limit)
_
Patches currently in -mm which might be from krafft@xxxxxxxxxx are
git-powerpc.patch
enables-booting-a-numa-system-where-some-nodes-have-no.patch
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