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[PATCH] enable booting a NUMA system where some nodes have no memory

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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 <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Martin Bligh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christian Krafft 2006-12-06 20:32:41 -08:00 • committed by Linus Torvalds
commit 7c309a64d6
1 changed files with 4 additions and 0 deletions
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4
mm/bootmem.c
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@ -196,6 +196,10 @@ __alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size,
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)