mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 20:42:39 +00:00
a406c3664e
cpumask: ensure that node_to_cpumask() is available to modules for all supported combinations of architecture and CONFIG_NUMA. Signed-off-by: Greg Banks <gnb@melbourne.sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* ia64 kernel NUMA specific stuff
|
|
*
|
|
* Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
|
|
* Copyright (C) 2004 Silicon Graphics, Inc.
|
|
* Jesse Barnes <jbarnes@sgi.com>
|
|
*/
|
|
#include <linux/topology.h>
|
|
#include <linux/module.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/smp.h>
|
|
|
|
u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
|
|
EXPORT_SYMBOL(cpu_to_node_map);
|
|
|
|
cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
|
|
EXPORT_SYMBOL(node_to_cpu_mask);
|
|
|
|
void __cpuinit map_cpu_to_node(int cpu, int nid)
|
|
{
|
|
int oldnid;
|
|
if (nid < 0) { /* just initialize by zero */
|
|
cpu_to_node_map[cpu] = 0;
|
|
return;
|
|
}
|
|
/* sanity check first */
|
|
oldnid = cpu_to_node_map[cpu];
|
|
if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) {
|
|
return; /* nothing to do */
|
|
}
|
|
/* we don't have cpu-driven node hot add yet...
|
|
In usual case, node is created from SRAT at boot time. */
|
|
if (!node_online(nid))
|
|
nid = first_online_node;
|
|
cpu_to_node_map[cpu] = nid;
|
|
cpu_set(cpu, node_to_cpu_mask[nid]);
|
|
return;
|
|
}
|
|
|
|
void __cpuinit unmap_cpu_from_node(int cpu, int nid)
|
|
{
|
|
WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid]));
|
|
WARN_ON(cpu_to_node_map[cpu] != nid);
|
|
cpu_to_node_map[cpu] = 0;
|
|
cpu_clear(cpu, node_to_cpu_mask[nid]);
|
|
}
|
|
|
|
|
|
/**
|
|
* build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
|
|
*
|
|
* Build cpu to node mapping and initialize the per node cpu masks using
|
|
* info from the node_cpuid array handed to us by ACPI.
|
|
*/
|
|
void __init build_cpu_to_node_map(void)
|
|
{
|
|
int cpu, i, node;
|
|
|
|
for(node=0; node < MAX_NUMNODES; node++)
|
|
cpus_clear(node_to_cpu_mask[node]);
|
|
|
|
for(cpu = 0; cpu < NR_CPUS; ++cpu) {
|
|
node = -1;
|
|
for (i = 0; i < NR_CPUS; ++i)
|
|
if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
|
|
node = node_cpuid[i].nid;
|
|
break;
|
|
}
|
|
map_cpu_to_node(cpu, node);
|
|
}
|
|
}
|