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>
diff --git a/include/asm-generic/topology.h b/include/asm-generic/topology.h
index 342a2a0..a6aea79 100644
--- a/include/asm-generic/topology.h
+++ b/include/asm-generic/topology.h
@@ -27,6 +27,8 @@
#ifndef _ASM_GENERIC_TOPOLOGY_H
#define _ASM_GENERIC_TOPOLOGY_H
+#ifndef CONFIG_NUMA
+
/* Other architectures wishing to use this simple topology API should fill
in the below functions as appropriate in their own <asm/topology.h> file. */
#ifndef cpu_to_node
@@ -52,4 +54,16 @@
)
#endif
+#endif /* CONFIG_NUMA */
+
+/* returns pointer to cpumask for specified node */
+#ifndef node_to_cpumask_ptr
+
+#define node_to_cpumask_ptr(v, node) \
+ cpumask_t _##v = node_to_cpumask(node), *v = &_##v
+
+#define node_to_cpumask_ptr_next(v, node) \
+ _##v = node_to_cpumask(node)
+#endif
+
#endif /* _ASM_GENERIC_TOPOLOGY_H */