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From 32075635db57c3d5efe12f8fb569af857e01ccad Mon Sep 17 00:00:00 2001
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From: Petr Holasek <pholasek@redhat.com>
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Date: Wed, 14 Jan 2015 09:53:47 +0100
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Subject: [PATCH] libnuma: add check for return value of numa_node_to_cpus
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When numa_node_to_cpu() has been called on machine with non-contiguous
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nodes, it returned the first node which wasn't present on machine.
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Now, return code is checked and code skips over non-existing nodes to
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the right one.
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Also, caching of numa_node_to_cpus_v2() result while non-zero error had
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been returned was disabled.
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Signed-off-by: Petr Holasek <pholasek@redhat.com>
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Tested by Cliff Wickman (on attica.sgi.com)
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---
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libnuma.c | 13 ++++++++++---
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1 file changed, 10 insertions(+), 3 deletions(-)
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diff -up numactl-2.0.9/libnuma.c.orig numactl-2.0.9/libnuma.c
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--- numactl-2.0.9/libnuma.c.orig 2013-10-08 23:34:57.000000000 +0200
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+++ numactl-2.0.9/libnuma.c 2015-07-01 15:14:44.937178134 +0200
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@@ -1380,8 +1380,12 @@ numa_node_to_cpus_v2(int node, struct bi
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if (mask != buffer)
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numa_bitmask_free(mask);
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} else {
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- node_cpu_mask_v2[node] = mask;
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- }
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+ /* we don't want to cache faulty result */
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+ if (!err)
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+ node_cpu_mask_v2[node] = mask;
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+ else
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+ numa_bitmask_free(mask);
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+ }
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return err;
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}
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__asm__(".symver numa_node_to_cpus_v2,numa_node_to_cpus@@libnuma_1.2");
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@@ -1403,7 +1407,10 @@ int numa_node_of_cpu(int cpu)
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bmp = numa_bitmask_alloc(ncpus);
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nnodes = numa_max_node();
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for (node = 0; node <= nnodes; node++){
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- numa_node_to_cpus_v2_int(node, bmp);
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+ if (numa_node_to_cpus_v2_int(node, bmp) < 0) {
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+ /* It's possible for the node to not exist */
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+ continue;
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+ }
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if (numa_bitmask_isbitset(bmp, cpu)){
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ret = node;
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goto end;
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