qapi: Use QAPI_LIST_APPEND in trivial cases

The easiest spots to use QAPI_LIST_APPEND are where we already have an
obvious pointer to the tail of a list.  While at it, consistently use
the variable name 'tail' for that purpose.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210113221013.390592-5-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

2 files changed, 12 insertions, 30 deletions

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index edf785b2da..f0a23b0402 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -2474,18 +2474,17 @@ static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
 {
     int64_t current;
-    GuestLogicalProcessorList *head, **link;
+    GuestLogicalProcessorList *head, **tail;
     long sc_max;
     Error *local_err = NULL;
 
     current = 0;
     head = NULL;
-    link = &head;
+    tail = &head;
     sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
 
     while (local_err == NULL && current < sc_max) {
         GuestLogicalProcessor *vcpu;
-        GuestLogicalProcessorList *entry;
         int64_t id = current++;
         char *path = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
                                      id);
@@ -2495,10 +2494,7 @@ GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
             vcpu->logical_id = id;
             vcpu->has_can_offline = true; /* lolspeak ftw */
             transfer_vcpu(vcpu, true, path, &local_err);
-            entry = g_malloc0(sizeof *entry);
-            entry->value = vcpu;
-            *link = entry;
-            link = &entry->next;
+            QAPI_LIST_APPEND(tail, vcpu);
         }
         g_free(path);
     }
@@ -2831,13 +2827,13 @@ out1:
 
 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
 {
-    GuestMemoryBlockList *head, **link;
+    GuestMemoryBlockList *head, **tail;
     Error *local_err = NULL;
     struct dirent *de;
     DIR *dp;
 
     head = NULL;
-    link = &head;
+    tail = &head;
 
     dp = opendir("/sys/devices/system/memory/");
     if (!dp) {
@@ -2859,7 +2855,6 @@ GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
      */
     while ((de = readdir(dp)) != NULL) {
         GuestMemoryBlock *mem_blk;
-        GuestMemoryBlockList *entry;
 
         if ((strncmp(de->d_name, "memory", 6) != 0) ||
             !(de->d_type & DT_DIR)) {
@@ -2875,11 +2870,7 @@ GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
             break;
         }
 
-        entry = g_malloc0(sizeof *entry);
-        entry->value = mem_blk;
-
-        *link = entry;
-        link = &entry->next;
+        QAPI_LIST_APPEND(tail, mem_blk);
     }
 
     closedir(dp);
@@ -2899,15 +2890,14 @@ GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
 GuestMemoryBlockResponseList *
 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
 {
-    GuestMemoryBlockResponseList *head, **link;
+    GuestMemoryBlockResponseList *head, **tail;
     Error *local_err = NULL;
 
     head = NULL;
-    link = &head;
+    tail = &head;
 
     while (mem_blks != NULL) {
         GuestMemoryBlockResponse *result;
-        GuestMemoryBlockResponseList *entry;
         GuestMemoryBlock *current_mem_blk = mem_blks->value;
 
         result = g_malloc0(sizeof(*result));
@@ -2916,11 +2906,8 @@ qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
         if (local_err) { /* should never happen */
             goto err;
         }
-        entry = g_malloc0(sizeof *entry);
-        entry->value = result;
 
-        *link = entry;
-        link = &entry->next;
+        QAPI_LIST_APPEND(tail, result);
         mem_blks = mem_blks->next;
     }
 
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 684639bd13..a6cc481bc3 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -1833,7 +1833,7 @@ GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
 {
     PSYSTEM_LOGICAL_PROCESSOR_INFORMATION pslpi, ptr;
     DWORD length;
-    GuestLogicalProcessorList *head, **link;
+    GuestLogicalProcessorList *head, **tail;
     Error *local_err = NULL;
     int64_t current;
 
@@ -1841,7 +1841,7 @@ GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
     length = 0;
     current = 0;
     head = NULL;
-    link = &head;
+    tail = &head;
 
     if ((GetLogicalProcessorInformation(pslpi, &length) == FALSE) &&
         (GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
@@ -1864,18 +1864,13 @@ GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
             while (cpu_bits > 0) {
                 if (!!(cpu_bits & 1)) {
                     GuestLogicalProcessor *vcpu;
-                    GuestLogicalProcessorList *entry;
 
                     vcpu = g_malloc0(sizeof *vcpu);
                     vcpu->logical_id = current++;
                     vcpu->online = true;
                     vcpu->has_can_offline = true;
 
-                    entry = g_malloc0(sizeof *entry);
-                    entry->value = vcpu;
-
-                    *link = entry;
-                    link = &entry->next;
+                    QAPI_LIST_APPEND(tail, vcpu);
                 }
                 cpu_bits >>= 1;
             }