linux/include/asm-alpha/topology.h
Mike Travis aa6b54461c asm-generic: add node_to_cpumask_ptr macro
Create a simple macro to always return a pointer to the node_to_cpumask(node)
value.  This relies on compiler optimization to remove the extra indirection:

    #define node_to_cpumask_ptr(v, node) 		\
	    cpumask_t _##v = node_to_cpumask(node), *v = &_##v

For those systems with a large cpumask size, then a true pointer
to the array element can be used:

    #define node_to_cpumask_ptr(v, node)		\
	    cpumask_t *v = &(node_to_cpumask_map[node])

A node_to_cpumask_ptr_next() macro is provided to access another
node_to_cpumask value.

The other change is to always include asm-generic/topology.h moving the
ifdef CONFIG_NUMA to this same file.

Note: there are no references to either of these new macros in this patch,
only the definition.

Based on 2.6.25-rc5-mm1

# alpha
Cc: Richard Henderson <rth@twiddle.net>

# fujitsu
Cc: David Howells <dhowells@redhat.com>

# ia64
Cc: Tony Luck <tony.luck@intel.com>

# powerpc
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>

# sparc
Cc: David S. Miller <davem@davemloft.net>
Cc: William L. Irwin <wli@holomorphy.com>

# x86
Cc: H. Peter Anvin <hpa@zytor.com>

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-19 19:44:58 +02:00

48 lines
811 B
C

#ifndef _ASM_ALPHA_TOPOLOGY_H
#define _ASM_ALPHA_TOPOLOGY_H
#include <linux/smp.h>
#include <linux/threads.h>
#include <asm/machvec.h>
#ifdef CONFIG_NUMA
static inline int cpu_to_node(int cpu)
{
int node;
if (!alpha_mv.cpuid_to_nid)
return 0;
node = alpha_mv.cpuid_to_nid(cpu);
#ifdef DEBUG_NUMA
BUG_ON(node < 0);
#endif
return node;
}
static inline cpumask_t node_to_cpumask(int node)
{
cpumask_t node_cpu_mask = CPU_MASK_NONE;
int cpu;
for_each_online_cpu(cpu) {
if (cpu_to_node(cpu) == node)
cpu_set(cpu, node_cpu_mask);
}
#ifdef DEBUG_NUMA
printk("node %d: cpu_mask: %016lx\n", node, node_cpu_mask);
#endif
return node_cpu_mask;
}
#define pcibus_to_cpumask(bus) (cpu_online_map)
#endif /* !CONFIG_NUMA */
# include <asm-generic/topology.h>
#endif /* _ASM_ALPHA_TOPOLOGY_H */