qemu/atomic.h: rename atomic_ to qatomic_

clang's C11 atomic_fetch_*() functions only take a C11 atomic type
pointer argument. QEMU uses direct types (int, etc) and this causes a
compiler error when a QEMU code calls these functions in a source file
that also included <stdatomic.h> via a system header file:

  $ CC=clang CXX=clang++ ./configure ... && make
  ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid)

Avoid using atomic_*() names in QEMU's atomic.h since that namespace is
used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h
and <stdatomic.h> can co-exist. I checked /usr/include on my machine and
searched GitHub for existing "qatomic_" users but there seem to be none.

This patch was generated using:

  $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \
    sort -u >/tmp/changed_identifiers
  $ for identifier in $(</tmp/changed_identifiers); do
        sed -i "s%\<$identifier\>%q$identifier%g" \
            $(git grep -I -l "\<$identifier\>")
    done

I manually fixed line-wrap issues and misaligned rST tables.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923105646.47864-1-stefanha@redhat.com>

1 files changed, 10 insertions, 10 deletions

diff --git a/qom/object.c b/qom/object.c
index a91a6a515a..1196970635 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -867,7 +867,7 @@ Object *object_dynamic_cast_assert(Object *obj, const char *typename,
     Object *inst;
 
     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
-        if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
+        if (qatomic_read(&obj->class->object_cast_cache[i]) == typename) {
             goto out;
         }
     }
@@ -884,10 +884,10 @@ Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 
     if (obj && obj == inst) {
         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
-            atomic_set(&obj->class->object_cast_cache[i - 1],
-                       atomic_read(&obj->class->object_cast_cache[i]));
+            qatomic_set(&obj->class->object_cast_cache[i - 1],
+                       qatomic_read(&obj->class->object_cast_cache[i]));
         }
-        atomic_set(&obj->class->object_cast_cache[i - 1], typename);
+        qatomic_set(&obj->class->object_cast_cache[i - 1], typename);
     }
 
 out:
@@ -957,7 +957,7 @@ ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
     int i;
 
     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
-        if (atomic_read(&class->class_cast_cache[i]) == typename) {
+        if (qatomic_read(&class->class_cast_cache[i]) == typename) {
             ret = class;
             goto out;
         }
@@ -978,10 +978,10 @@ ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 #ifdef CONFIG_QOM_CAST_DEBUG
     if (class && ret == class) {
         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
-            atomic_set(&class->class_cast_cache[i - 1],
-                       atomic_read(&class->class_cast_cache[i]));
+            qatomic_set(&class->class_cast_cache[i - 1],
+                       qatomic_read(&class->class_cast_cache[i]));
         }
-        atomic_set(&class->class_cast_cache[i - 1], typename);
+        qatomic_set(&class->class_cast_cache[i - 1], typename);
     }
 out:
 #endif
@@ -1166,7 +1166,7 @@ Object *object_ref(void *objptr)
     if (!obj) {
         return NULL;
     }
-    atomic_inc(&obj->ref);
+    qatomic_inc(&obj->ref);
     return obj;
 }
 
@@ -1179,7 +1179,7 @@ void object_unref(void *objptr)
     g_assert(obj->ref > 0);
 
     /* parent always holds a reference to its children */
-    if (atomic_fetch_dec(&obj->ref) == 1) {
+    if (qatomic_fetch_dec(&obj->ref) == 1) {
         object_finalize(obj);
     }
 }