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>

2 files changed, 3 insertions, 16 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;
 }