[v7,02/73] cpu: rename cpu->work_mutex to cpu->lock

Commit Message

Emilio Cota March 4, 2019, 6:17 p.m. UTC

This lock will soon protect more fields of the struct. Give
it a more appropriate name.

Reviewed-by: Richard Henderson <[e-mail]>
Reviewed-by: Alex Bennée <[e-mail]>
Signed-off-by: Emilio G. Cota <[e-mail]>
---
 include/qom/cpu.h |  6 ++++--
 cpus-common.c     | 14 +++++++-------
 cpus.c            |  4 ++--
 qom/cpu.c         |  2 +-
 4 files changed, 14 insertions(+), 12 deletions(-)

Patch

diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index b47f3507fa..721a324199 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -333,7 +333,8 @@  struct qemu_work_item;
  * @mem_io_pc: Host Program Counter at which the memory was accessed.
  * @mem_io_vaddr: Target virtual address at which the memory was accessed.
  * @kvm_fd: vCPU file descriptor for KVM.
- * @work_mutex: Lock to prevent multiple access to @work_list.
+ * @lock: Lock to prevent multiple access to per-CPU fields. Must be acquired
+ *        after the BQL.
  * @work_list: List of pending asynchronous work.
  * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes
  *                        to @trace_dstate).
@@ -374,7 +375,8 @@  struct CPUState {
     int64_t icount_extra;
     sigjmp_buf jmp_env;
 
-    QemuMutex work_mutex;
+    QemuMutex lock;
+    /* fields below protected by @lock */
     QSIMPLEQ_HEAD(, qemu_work_item) work_list;
 
     CPUAddressSpace *cpu_ases;
diff --git a/cpus-common.c b/cpus-common.c
index a1bbf4139f..d0e619f149 100644
--- a/cpus-common.c
+++ b/cpus-common.c
@@ -115,10 +115,10 @@  struct qemu_work_item {
 
 static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi)
 {
-    qemu_mutex_lock(&cpu->work_mutex);
+    qemu_mutex_lock(&cpu->lock);
     QSIMPLEQ_INSERT_TAIL(&cpu->work_list, wi, node);
     wi->done = false;
-    qemu_mutex_unlock(&cpu->work_mutex);
+    qemu_mutex_unlock(&cpu->lock);
 
     qemu_cpu_kick(cpu);
 }
@@ -308,15 +308,15 @@  void process_queued_cpu_work(CPUState *cpu)
 {
     struct qemu_work_item *wi;
 
-    qemu_mutex_lock(&cpu->work_mutex);
+    qemu_mutex_lock(&cpu->lock);
     if (QSIMPLEQ_EMPTY(&cpu->work_list)) {
-        qemu_mutex_unlock(&cpu->work_mutex);
+        qemu_mutex_unlock(&cpu->lock);
         return;
     }
     while (!QSIMPLEQ_EMPTY(&cpu->work_list)) {
         wi = QSIMPLEQ_FIRST(&cpu->work_list);
         QSIMPLEQ_REMOVE_HEAD(&cpu->work_list, node);
-        qemu_mutex_unlock(&cpu->work_mutex);
+        qemu_mutex_unlock(&cpu->lock);
         if (wi->exclusive) {
             /* Running work items outside the BQL avoids the following deadlock:
              * 1) start_exclusive() is called with the BQL taken while another
@@ -332,13 +332,13 @@  void process_queued_cpu_work(CPUState *cpu)
         } else {
             wi->func(cpu, wi->data);
         }
-        qemu_mutex_lock(&cpu->work_mutex);
+        qemu_mutex_lock(&cpu->lock);
         if (wi->free) {
             g_free(wi);
         } else {
             atomic_mb_set(&wi->done, true);
         }
     }
-    qemu_mutex_unlock(&cpu->work_mutex);
+    qemu_mutex_unlock(&cpu->lock);
     qemu_cond_broadcast(&qemu_work_cond);
 }
diff --git a/cpus.c b/cpus.c
index 90eabcf977..acd453a3ae 100644
--- a/cpus.c
+++ b/cpus.c
@@ -92,9 +92,9 @@  static inline bool cpu_work_list_empty(CPUState *cpu)
 {
     bool ret;
 
-    qemu_mutex_lock(&cpu->work_mutex);
+    qemu_mutex_lock(&cpu->lock);
     ret = QSIMPLEQ_EMPTY(&cpu->work_list);
-    qemu_mutex_unlock(&cpu->work_mutex);
+    qemu_mutex_unlock(&cpu->lock);
     return ret;
 }
 
diff --git a/qom/cpu.c b/qom/cpu.c
index 06d6b6044d..a2964e53c6 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -371,7 +371,7 @@  static void cpu_common_initfn(Object *obj)
     cpu->nr_cores = 1;
     cpu->nr_threads = 1;
 
-    qemu_mutex_init(&cpu->work_mutex);
+    qemu_mutex_init(&cpu->lock);
     QSIMPLEQ_INIT(&cpu->work_list);
     QTAILQ_INIT(&cpu->breakpoints);
     QTAILQ_INIT(&cpu->watchpoints);