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powerpc/numa: Limit possible nodes to within num_possible_nodes 

MAX_NUMNODES is a theoretical maximum number of nodes thats is
supported by the kernel. Device tree properties exposes the number of
possible nodes on the current platform. The kernel would detected this
and would use it for most of its resource allocations. If the platform
now increases the nodes to over what was already exposed, then it may
lead to inconsistencies. Hence limit it to the already exposed nodes.

Suggested-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724105809.24733-1-srikar@linux.vnet.ibm.com
This commit is contained in:
Srikar Dronamraju 2020-07-24 16:28:09 +05:30 committed by Michael Ellerman
parent 3327e58a04
commit dbce456280
1 changed files with 4 additions and 3 deletions
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7
arch/powerpc/mm/numa.c
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@ -221,7 +221,8 @@ static void initialize_distance_lookup_table(int nid,
} }
} }
/* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa /*
* Returns nid in the range [0..nr_node_ids], or -1 if no useful NUMA
* info is found. * info is found.
*/ */
static int associativity_to_nid(const __be32 *associativity) static int associativity_to_nid(const __be32 *associativity)
@ -235,7 +236,7 @@ static int associativity_to_nid(const __be32 *associativity)
nid = of_read_number(&associativity[min_common_depth], 1); nid = of_read_number(&associativity[min_common_depth], 1);
/* POWER4 LPAR uses 0xffff as invalid node */ /* POWER4 LPAR uses 0xffff as invalid node */
if (nid == 0xffff || nid >= MAX_NUMNODES) if (nid == 0xffff || nid >= nr_node_ids)
nid = NUMA_NO_NODE; nid = NUMA_NO_NODE;
if (nid > 0 && if (nid > 0 &&
@ -448,7 +449,7 @@ static int of_drconf_to_nid_single(struct drmem_lmb *lmb)
index = lmb->aa_index * aa.array_sz + min_common_depth - 1; index = lmb->aa_index * aa.array_sz + min_common_depth - 1;
nid = of_read_number(&aa.arrays[index], 1); nid = of_read_number(&aa.arrays[index], 1);
if (nid == 0xffff || nid >= MAX_NUMNODES) if (nid == 0xffff || nid >= nr_node_ids)
nid = default_nid; nid = default_nid;
if (nid > 0) { if (nid > 0) {