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>

1 files changed, 4 insertions, 10 deletions

diff --git a/util/qemu-config.c b/util/qemu-config.c
index 725e3d7e4b..e2a700b284 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -55,7 +55,7 @@ QemuOpts *qemu_find_opts_singleton(const char *group)
 
 static CommandLineParameterInfoList *query_option_descs(const QemuOptDesc *desc)
 {
-    CommandLineParameterInfoList *param_list = NULL, *entry;
+    CommandLineParameterInfoList *param_list = NULL;
     CommandLineParameterInfo *info;
     int i;
 
@@ -87,10 +87,7 @@ static CommandLineParameterInfoList *query_option_descs(const QemuOptDesc *desc)
             info->q_default = g_strdup(desc[i].def_value_str);
         }
 
-        entry = g_malloc0(sizeof(*entry));
-        entry->value = info;
-        entry->next = param_list;
-        param_list = entry;
+        QAPI_LIST_PREPEND(param_list, info);
     }
 
     return param_list;
@@ -246,7 +243,7 @@ CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
                                                           const char *option,
                                                           Error **errp)
 {
-    CommandLineOptionInfoList *conf_list = NULL, *entry;
+    CommandLineOptionInfoList *conf_list = NULL;
     CommandLineOptionInfo *info;
     int i;
 
@@ -262,10 +259,7 @@ CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
                 info->parameters =
                     query_option_descs(vm_config_groups[i]->desc);
             }
-            entry = g_malloc0(sizeof(*entry));
-            entry->value = info;
-            entry->next = conf_list;
-            conf_list = entry;
+            QAPI_LIST_PREPEND(conf_list, info);
         }
     }