qtail: clean up direct access to tqe_prev field

instead of accessing tqe_prev field dircetly outside
of queue.h use macros to check if element is in list
and make sure that afer element is removed from list
tqe_prev field could be used to do the same check.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1469450832-84343-1-git-send-email-imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/exec.c b/exec.c
index 80398b038f..ce3fb9ec8e 100644
--- a/exec.c
+++ b/exec.c
@@ -617,7 +617,7 @@ void cpu_exec_exit(CPUState *cpu)
     CPUClass *cc = CPU_GET_CLASS(cpu);
 
     cpu_list_lock();
-    if (cpu->node.tqe_prev == NULL) {
+    if (!QTAILQ_IN_USE(cpu, node)) {
         /* there is nothing to undo since cpu_exec_init() hasn't been called */
         cpu_list_unlock();
         return;
@@ -626,7 +626,6 @@ void cpu_exec_exit(CPUState *cpu)
     assert(!(cpu_index_auto_assigned && cpu != QTAILQ_LAST(&cpus, CPUTailQ)));
 
     QTAILQ_REMOVE(&cpus, cpu, node);
-    cpu->node.tqe_prev = NULL;
     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
     cpu_list_unlock();