b339752d05
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>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
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* linux/include/asm-generic/topology.h
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*
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* Written by: Matthew Dobson, IBM Corporation
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <colpatch@us.ibm.com>
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*/
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#ifndef _ASM_GENERIC_TOPOLOGY_H
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#define _ASM_GENERIC_TOPOLOGY_H
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#ifndef CONFIG_NUMA
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/* Other architectures wishing to use this simple topology API should fill
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in the below functions as appropriate in their own <asm/topology.h> file. */
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#ifndef cpu_to_node
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#define cpu_to_node(cpu) ((void)(cpu),0)
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#endif
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#ifndef set_numa_node
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#define set_numa_node(node)
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#endif
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#ifndef set_cpu_numa_node
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#define set_cpu_numa_node(cpu, node)
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#endif
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#ifndef cpu_to_mem
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#define cpu_to_mem(cpu) ((void)(cpu),0)
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#endif
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#ifndef parent_node
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#define parent_node(node) ((void)(node),0)
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#endif
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#ifndef cpumask_of_node
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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#define cpumask_of_node(node) ((node) == 0 ? cpu_online_mask : cpu_none_mask)
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#else
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#define cpumask_of_node(node) ((void)node, cpu_online_mask)
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#endif
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#endif
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#ifndef pcibus_to_node
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#define pcibus_to_node(bus) ((void)(bus), -1)
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#endif
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#ifndef cpumask_of_pcibus
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#define cpumask_of_pcibus(bus) (pcibus_to_node(bus) == -1 ? \
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cpu_all_mask : \
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cpumask_of_node(pcibus_to_node(bus)))
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#endif
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#endif /* CONFIG_NUMA */
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#if !defined(CONFIG_NUMA) || !defined(CONFIG_HAVE_MEMORYLESS_NODES)
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#ifndef set_numa_mem
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#define set_numa_mem(node)
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#endif
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#ifndef set_cpu_numa_mem
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#define set_cpu_numa_mem(cpu, node)
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#endif
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#endif /* !CONFIG_NUMA || !CONFIG_HAVE_MEMORYLESS_NODES */
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#endif /* _ASM_GENERIC_TOPOLOGY_H */
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