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cpumask: fix spurious cpumask_of_node() on non-NUMA multi-node configs 

When !NUMA, cpumask_of_node(@node) equals cpu_online_mask regardless of
@node.  The assumption seems that if !NUMA, there shouldn't be more than
one node and thus reporting cpu_online_mask regardless of @node is
correct.  However, that assumption was broken years ago to support
DISCONTIGMEM and whether a system has multiple nodes or not is
separately controlled by NEED_MULTIPLE_NODES.

This means that, on a system with !NUMA && NEED_MULTIPLE_NODES,
cpumask_of_node() will report cpu_online_mask for all possible nodes,
indicating that the CPUs are associated with multiple nodes which is an
impossible configuration.

This bug has been around forever but doesn't look like it has caused any
noticeable symptoms.  However, it triggers a WARN recently added to
workqueue to verify NUMA affinity configuration.

Fix it by reporting empty cpumask on non-zero nodes if !NUMA.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo 2017-08-28 14:51:27 -07:00 committed by Linus Torvalds
parent e8206d2baa
commit b339752d05
1 changed files with 5 additions and 1 deletions
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6
include/asm-generic/topology.h
View File

@ -48,7 +48,11 @@
#define parent_node(node) ((void)(node),0)
#endif
#ifndef cpumask_of_node
#define cpumask_of_node(node) ((void)node, cpu_online_mask)
#ifdef CONFIG_NEED_MULTIPLE_NODES
#define cpumask_of_node(node) ((node) == 0 ? cpu_online_mask : cpu_none_mask)
#else
#define cpumask_of_node(node) ((void)node, cpu_online_mask)
#endif
#endif
#ifndef pcibus_to_node
#define pcibus_to_node(bus) ((void)(bus), -1)