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| author | Christian Krafft <krafft@de.ibm.com> | 2006-12-06 20:32:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:22 -0800 |
| commit | 7c309a64d6afa90a0a07813c836ba480aeaeca8c (patch) | |
| tree | a56b235fa35c2e528752071df2a6e21a25a4e8f6 | |
| parent | a120586873d3d64de93bd6d593d237e131994e58 (diff) | |
| download | linux-3.10-7c309a64d6afa90a0a07813c836ba480aeaeca8c.tar.gz linux-3.10-7c309a64d6afa90a0a07813c836ba480aeaeca8c.tar.bz2 linux-3.10-7c309a64d6afa90a0a07813c836ba480aeaeca8c.zip | |
[PATCH] enable booting a NUMA system where some nodes have no memory
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@de.ibm.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Martin Bligh <mbligh@google.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | mm/bootmem.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c index d53112fcb40..94253428f09 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -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) |