MINOR: cpu-topo: allocate and initialize the ha_cpu_topo array.

This does the bare minimum to allocate and initialize a global
ha_cpu_topo array for the number of supported CPUs and release
it at deinit time.

Makefile

@@ -596,6 +596,7 @@ endif
 
 ifneq ($(USE_CPU_AFFINITY:0=),)
   OPTIONS_OBJS   += src/cpuset.o
+  OPTIONS_OBJS   += src/cpu_topo.o
 endif
 
 # OpenSSL is packaged in various forms and with various dependencies.

include/haproxy/cpu_topo.h

@@ -0,0 +1,10 @@
+#ifndef _HAPROXY_CPU_TOPO_H
+#define _HAPROXY_CPU_TOPO_H
+
+#include <haproxy/api.h>
+#include <haproxy/cpuset.h>
+#include <haproxy/cpu_topo-t.h>
+
+extern struct ha_cpu_topo *ha_cpu_topo;
+
+#endif /* _HAPROXY_CPU_TOPO_H */

src/cpu_topo.c

@@ -0,0 +1,40 @@
+#define _GNU_SOURCE
+
+#include <haproxy/api.h>
+#include <haproxy/cpu_topo.h>
+
+/* CPU topology information, ha_cpuset_size() entries, allocated at boot */
+struct ha_cpu_topo *ha_cpu_topo = NULL;
+
+/* Allocates everything needed to store CPU topology at boot.
+ * Returns non-zero on success, zero on failure.
+ */
+static int cpu_topo_alloc(void)
+{
+	int maxcpus = ha_cpuset_size();
+	int cpu;
+
+	/* allocate the structures used to store CPU topology info */
+	ha_cpu_topo = (struct ha_cpu_topo*)malloc(maxcpus * sizeof(*ha_cpu_topo));
+	if (!ha_cpu_topo)
+		return 0;
+
+	/* preset all fields to -1 except the index and the state flags which
+	 * are assumed to all be bound and online unless detected otherwise.
+	 */
+	for (cpu = 0; cpu < maxcpus; cpu++) {
+		memset(&ha_cpu_topo[cpu], 0xff, sizeof(*ha_cpu_topo));
+		ha_cpu_topo[cpu].st  = 0;
+		ha_cpu_topo[cpu].idx = cpu;
+	}
+
+	return 1;
+}
+
+static void cpu_topo_deinit(void)
+{
+	ha_free(&ha_cpu_topo);
+}
+
+INITCALL0(STG_ALLOC, cpu_topo_alloc);
+REGISTER_POST_DEINIT(cpu_topo_deinit);