[Qemu-devel] [PATCH 19/21] add next_cpu_index

[Glauber Costa <glommer@redhat.com>]

From: Glauber Costa <gcosta@redhat.com>

separate the logic for calculating the next cpu index
from cpu creation. It will allow others to query what's
the next cpu index to be created before cpu creation.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
---
 exec.c |   22 ++++++++++++++--------
 1 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/exec.c b/exec.c
index bd2a26f..7710564 100644
--- a/exec.c
+++ b/exec.c
@@ -526,25 +526,31 @@ static int cpu_common_load(QEMUFile *f, void *opaque, int version_id)
 }
 #endif
 
-void cpu_exec_init(CPUState *env)
+int next_cpu_index(void)
 {
     CPUState **penv;
-    int cpu_index;
+    int cpu_index = 0;
 
-    env->next_cpu = NULL;
     penv = &first_cpu;
-    cpu_index = 0;
+
     while (*penv != NULL) {
         penv = (CPUState **)&(*penv)->next_cpu;
         cpu_index++;
     }
-    env->cpu_index = cpu_index;
+    return cpu_index;
+}
+
+void cpu_exec_init(CPUState *env)
+{
+    env->next_cpu = NULL;
+    env->cpu_index = next_cpu_index();
     env->nb_watchpoints = 0;
-    *penv = env;
+    if (env->cpu_index == 0)
+        first_cpu = env;
 #if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)
-    register_savevm("cpu_common", cpu_index, CPU_COMMON_SAVE_VERSION,
+    register_savevm("cpu_common", env->cpu_index, CPU_COMMON_SAVE_VERSION,
                     cpu_common_save, cpu_common_load, env);
-    register_savevm("cpu", cpu_index, CPU_SAVE_VERSION,
+    register_savevm("cpu", env->cpu_index, CPU_SAVE_VERSION,
                     cpu_save, cpu_load, env);
 #endif
 }
-- 
1.5.5.1