qapi: Use QAPI_LIST_PREPEND() where possible

Anywhere we create a list of just one item or by prepending items
(typically because order doesn't matter), we can use
QAPI_LIST_PREPEND().  But places where we must keep the list in order
by appending remain open-coded until later patches.

Note that as a side effect, this also performs a cleanup of two minor
issues in qga/commands-posix.c: the old code was performing
 new = g_malloc0(sizeof(*ret));
which 1) is confusing because you have to verify whether 'new' and
'ret' are variables with the same type, and 2) would conflict with C++
compilation (not an actual problem for this file, but makes
copy-and-paste harder).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201113011340.463563-5-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
[Straightforward conflicts due to commit a8aa94b5f8 "qga: update
schema for guest-get-disks 'dependents' field" and commit a10b453a52
"target/mips: Move mips_cpu_add_definition() from helper.c to cpu.c"
resolved.  Commit message tweaked.]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

6 files changed, 9 insertions, 46 deletions

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 7b8bcd6903..2d0d4cd1e1 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -8283,7 +8283,6 @@ static void arm_cpu_add_definition(gpointer data, gpointer user_data)
 {
     ObjectClass *oc = data;
     CpuDefinitionInfoList **cpu_list = user_data;
-    CpuDefinitionInfoList *entry;
     CpuDefinitionInfo *info;
     const char *typename;
 
@@ -8293,10 +8292,7 @@ static void arm_cpu_add_definition(gpointer data, gpointer user_data)
                            strlen(typename) - strlen("-" TYPE_ARM_CPU));
     info->q_typename = g_strdup(typename);
 
-    entry = g_malloc0(sizeof(*entry));
-    entry->value = info;
-    entry->next = *cpu_list;
-    *cpu_list = entry;
+    QAPI_LIST_PREPEND(*cpu_list, info);
 }
 
 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
diff --git a/target/arm/monitor.c b/target/arm/monitor.c
index 169d8a64b6..198b14e95e 100644
--- a/target/arm/monitor.c
+++ b/target/arm/monitor.c
@@ -42,15 +42,6 @@ static GICCapability *gic_cap_new(int version)
     return cap;
 }
 
-static GICCapabilityList *gic_cap_list_add(GICCapabilityList *head,
-                                           GICCapability *cap)
-{
-    GICCapabilityList *item = g_new0(GICCapabilityList, 1);
-    item->value = cap;
-    item->next = head;
-    return item;
-}
-
 static inline void gic_cap_kvm_probe(GICCapability *v2, GICCapability *v3)
 {
 #ifdef CONFIG_KVM
@@ -84,8 +75,8 @@ GICCapabilityList *qmp_query_gic_capabilities(Error **errp)
 
     gic_cap_kvm_probe(v2, v3);
 
-    head = gic_cap_list_add(head, v2);
-    head = gic_cap_list_add(head, v3);
+    QAPI_LIST_PREPEND(head, v2);
+    QAPI_LIST_PREPEND(head, v3);
 
     return head;
 }
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 0d20e156f2..35459a38bb 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5014,7 +5014,6 @@ static void x86_cpu_definition_entry(gpointer data, gpointer user_data)
     ObjectClass *oc = data;
     X86CPUClass *cc = X86_CPU_CLASS(oc);
     CpuDefinitionInfoList **cpu_list = user_data;
-    CpuDefinitionInfoList *entry;
     CpuDefinitionInfo *info;
 
     info = g_malloc0(sizeof(*info));
@@ -5039,10 +5038,7 @@ static void x86_cpu_definition_entry(gpointer data, gpointer user_data)
         info->has_alias_of = !!info->alias_of;
     }
 
-    entry = g_malloc0(sizeof(*entry));
-    entry->value = info;
-    entry->next = *cpu_list;
-    *cpu_list = entry;
+    QAPI_LIST_PREPEND(*cpu_list, info);
 }
 
 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index aadc6f8e74..b2cd69ff7f 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -543,7 +543,6 @@ static void mips_cpu_add_definition(gpointer data, gpointer user_data)
 {
     ObjectClass *oc = data;
     CpuDefinitionInfoList **cpu_list = user_data;
-    CpuDefinitionInfoList *entry;
     CpuDefinitionInfo *info;
     const char *typename;
 
@@ -553,10 +552,7 @@ static void mips_cpu_add_definition(gpointer data, gpointer user_data)
                            strlen(typename) - strlen("-" TYPE_MIPS_CPU));
     info->q_typename = g_strdup(typename);
 
-    entry = g_malloc0(sizeof(*entry));
-    entry->value = info;
-    entry->next = *cpu_list;
-    *cpu_list = entry;
+    QAPI_LIST_PREPEND(*cpu_list, info);
 }
 
 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
diff --git a/target/ppc/translate_init.c.inc b/target/ppc/translate_init.c.inc
index a4d0038828..3c05a17343 100644
--- a/target/ppc/translate_init.c.inc
+++ b/target/ppc/translate_init.c.inc
@@ -10566,7 +10566,6 @@ static void ppc_cpu_defs_entry(gpointer data, gpointer user_data)
     ObjectClass *oc = data;
     CpuDefinitionInfoList **first = user_data;
     const char *typename;
-    CpuDefinitionInfoList *entry;
     CpuDefinitionInfo *info;
 
     typename = object_class_get_name(oc);
@@ -10574,10 +10573,7 @@ static void ppc_cpu_defs_entry(gpointer data, gpointer user_data)
     info->name = g_strndup(typename,
                            strlen(typename) - strlen(POWERPC_CPU_TYPE_SUFFIX));
 
-    entry = g_malloc0(sizeof(*entry));
-    entry->value = info;
-    entry->next = *first;
-    *first = entry;
+    QAPI_LIST_PREPEND(*first, info);
 }
 
 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
@@ -10593,7 +10589,6 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
     for (i = 0; ppc_cpu_aliases[i].alias != NULL; i++) {
         PowerPCCPUAlias *alias = &ppc_cpu_aliases[i];
         ObjectClass *oc;
-        CpuDefinitionInfoList *entry;
         CpuDefinitionInfo *info;
 
         oc = ppc_cpu_class_by_name(alias->model);
@@ -10605,10 +10600,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
         info->name = g_strdup(alias->alias);
         info->q_typename = g_strdup(object_class_get_name(oc));
 
-        entry = g_malloc0(sizeof(*entry));
-        entry->value = info;
-        entry->next = cpu_list;
-        cpu_list = entry;
+        QAPI_LIST_PREPEND(cpu_list, info);
     }
 
     return cpu_list;
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index b5abff8bef..a23fd3e32b 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -427,7 +427,6 @@ static void create_cpu_model_list(ObjectClass *klass, void *opaque)
 {
     struct CpuDefinitionInfoListData *cpu_list_data = opaque;
     CpuDefinitionInfoList **cpu_list = &cpu_list_data->list;
-    CpuDefinitionInfoList *entry;
     CpuDefinitionInfo *info;
     char *name = g_strdup(object_class_get_name(klass));
     S390CPUClass *scc = S390_CPU_CLASS(klass);
@@ -454,10 +453,7 @@ static void create_cpu_model_list(ObjectClass *klass, void *opaque)
         object_unref(obj);
     }
 
-    entry = g_new0(CpuDefinitionInfoList, 1);
-    entry->value = info;
-    entry->next = *cpu_list;
-    *cpu_list = entry;
+    QAPI_LIST_PREPEND(*cpu_list, info);
 }
 
 CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
@@ -624,12 +620,8 @@ CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,
 static void list_add_feat(const char *name, void *opaque)
 {
     strList **last = (strList **) opaque;
-    strList *entry;
 
-    entry = g_new0(strList, 1);
-    entry->value = g_strdup(name);
-    entry->next = *last;
-    *last = entry;
+    QAPI_LIST_PREPEND(*last, g_strdup(name));
 }
 
 CpuModelCompareInfo *qmp_query_cpu_model_comparison(CpuModelInfo *infoa,