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>

backends/hostmem.c

@@ -80,27 +80,23 @@ host_memory_backend_get_host_nodes(Object *obj, Visitor *v, const char *name,
 {
     HostMemoryBackend *backend = MEMORY_BACKEND(obj);
     uint16List *host_nodes = NULL;
-    uint16List **node = &host_nodes;
+    uint16List **tail = &host_nodes;
     unsigned long value;
 
     value = find_first_bit(backend->host_nodes, MAX_NODES);
     if (value == MAX_NODES) {
         goto ret;
     }
 
-    *node = g_malloc0(sizeof(**node));
-    (*node)->value = value;
-    node = &(*node)->next;
+    QAPI_LIST_APPEND(tail, value);
 
     do {
         value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1);
         if (value == MAX_NODES) {
             break;
         }
 
-        *node = g_malloc0(sizeof(**node));
-        (*node)->value = value;
-        node = &(*node)->next;
+        QAPI_LIST_APPEND(tail, value);
     } while (true);
 
 ret:

block/dirty-bitmap.c

@@ -572,12 +572,12 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
 {
     BdrvDirtyBitmap *bm;
     BlockDirtyInfoList *list = NULL;
-    BlockDirtyInfoList **plist = &list;
+    BlockDirtyInfoList **tail = &list;
 
     bdrv_dirty_bitmaps_lock(bs);
     QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
         BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1);
-        BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1);
+
         info->count = bdrv_get_dirty_count(bm);
         info->granularity = bdrv_dirty_bitmap_granularity(bm);
         info->has_name = !!bm->name;
@@ -588,9 +588,7 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
         info->persistent = bm->persistent;
         info->has_inconsistent = bm->inconsistent;
         info->inconsistent = bm->inconsistent;
-        entry->value = info;
-        *plist = entry;
-        plist = &entry->next;
+        QAPI_LIST_APPEND(tail, info);
     }
     bdrv_dirty_bitmaps_unlock(bs);
 

block/export/export.c

@@ -342,11 +342,10 @@ void qmp_block_export_del(const char *id,
 
 BlockExportInfoList *qmp_query_block_exports(Error **errp)
 {
-    BlockExportInfoList *head = NULL, **p_next = &head;
+    BlockExportInfoList *head = NULL, **tail = &head;
     BlockExport *exp;
 
     QLIST_FOREACH(exp, &block_exports, next) {
-        BlockExportInfoList *entry = g_new0(BlockExportInfoList, 1);
         BlockExportInfo *info = g_new(BlockExportInfo, 1);
         *info = (BlockExportInfo) {
             .id             = g_strdup(exp->id),
@@ -355,9 +354,7 @@ BlockExportInfoList *qmp_query_block_exports(Error **errp)
             .shutting_down  = !exp->user_owned,
         };
 
-        entry->value = info;
-        *p_next = entry;
-        p_next = &entry->next;
+        QAPI_LIST_APPEND(tail, info);
     }
 
     return head;

block/qapi.c

@@ -418,17 +418,12 @@ static uint64List *uint64_list(uint64_t *list, int size)
 {
     int i;
     uint64List *out_list = NULL;
-    uint64List **pout_list = &out_list;
+    uint64List **tail = &out_list;
 
     for (i = 0; i < size; i++) {
-        uint64List *entry = g_new(uint64List, 1);
-        entry->value = list[i];
-        *pout_list = entry;
-        pout_list = &entry->next;
+        QAPI_LIST_APPEND(tail, list[i]);
     }
 
-    *pout_list = NULL;
-
     return out_list;
 }
 
@@ -636,26 +631,21 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
                                      bool query_nodes,
                                      Error **errp)
 {
-    BlockStatsList *head = NULL, **p_next = &head;
+    BlockStatsList *head = NULL, **tail = &head;
     BlockBackend *blk;
     BlockDriverState *bs;
 
     /* Just to be safe if query_nodes is not always initialized */
     if (has_query_nodes && query_nodes) {
         for (bs = bdrv_next_node(NULL); bs; bs = bdrv_next_node(bs)) {
-            BlockStatsList *info = g_malloc0(sizeof(*info));
             AioContext *ctx = bdrv_get_aio_context(bs);
 
             aio_context_acquire(ctx);
-            info->value = bdrv_query_bds_stats(bs, false);
+            QAPI_LIST_APPEND(tail, bdrv_query_bds_stats(bs, false));
             aio_context_release(ctx);
-
-            *p_next = info;
-            p_next = &info->next;
         }
     } else {
         for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
-            BlockStatsList *info;
             AioContext *ctx = blk_get_aio_context(blk);
             BlockStats *s;
             char *qdev;
@@ -680,10 +670,7 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
             bdrv_query_blk_stats(s->stats, blk);
             aio_context_release(ctx);
 
-            info = g_malloc0(sizeof(*info));
-            info->value = s;
-            *p_next = info;
-            p_next = &info->next;
+            QAPI_LIST_APPEND(tail, s);
         }
     }
 

block/qcow2-bitmap.c

@@ -1061,7 +1061,7 @@ bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, Error **errp)
 static Qcow2BitmapInfoFlagsList *get_bitmap_info_flags(uint32_t flags)
 {
     Qcow2BitmapInfoFlagsList *list = NULL;
-    Qcow2BitmapInfoFlagsList **plist = &list;
+    Qcow2BitmapInfoFlagsList **tail = &list;
     int i;
 
     static const struct {
@@ -1076,11 +1076,7 @@ static Qcow2BitmapInfoFlagsList *get_bitmap_info_flags(uint32_t flags)
 
     for (i = 0; i < map_size; ++i) {
         if (flags & map[i].bme) {
-            Qcow2BitmapInfoFlagsList *entry =
-                g_new0(Qcow2BitmapInfoFlagsList, 1);
-            entry->value = map[i].info;
-            *plist = entry;
-            plist = &entry->next;
+            QAPI_LIST_APPEND(tail, map[i].info);
             flags &= ~map[i].bme;
         }
     }
@@ -1105,7 +1101,7 @@ Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
     Qcow2BitmapList *bm_list;
     Qcow2Bitmap *bm;
     Qcow2BitmapInfoList *list = NULL;
-    Qcow2BitmapInfoList **plist = &list;
+    Qcow2BitmapInfoList **tail = &list;
 
     if (s->nb_bitmaps == 0) {
         return NULL;
@@ -1119,13 +1115,10 @@ Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
 
     QSIMPLEQ_FOREACH(bm, bm_list, entry) {
         Qcow2BitmapInfo *info = g_new0(Qcow2BitmapInfo, 1);
-        Qcow2BitmapInfoList *obj = g_new0(Qcow2BitmapInfoList, 1);
         info->granularity = 1U << bm->granularity_bits;
         info->name = g_strdup(bm->name);
         info->flags = get_bitmap_info_flags(bm->flags & ~BME_RESERVED_FLAGS);
-        obj->value = info;
-        *plist = obj;
-        plist = &obj->next;
+        QAPI_LIST_APPEND(tail, info);
     }
 
     bitmap_list_free(bm_list);

block/vmdk.c

@@ -2928,7 +2928,7 @@ static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs,
     int i;
     BDRVVmdkState *s = bs->opaque;
     ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
-    ImageInfoList **next;
+    ImageInfoList **tail;
 
     *spec_info = (ImageInfoSpecific){
         .type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
@@ -2943,12 +2943,9 @@ static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs,
         .parent_cid = s->parent_cid,
     };
 
-    next = &spec_info->u.vmdk.data->extents;
+    tail = &spec_info->u.vmdk.data->extents;
     for (i = 0; i < s->num_extents; i++) {
-        *next = g_new0(ImageInfoList, 1);
-        (*next)->value = vmdk_get_extent_info(&s->extents[i]);
-        (*next)->next = NULL;
-        next = &(*next)->next;
+        QAPI_LIST_APPEND(tail, vmdk_get_extent_info(&s->extents[i]));
     }
 
     return spec_info;

blockdev.c

@@ -3725,28 +3725,25 @@ void qmp_x_blockdev_change(const char *parent, bool has_child,
 
 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
 {
-    BlockJobInfoList *head = NULL, **p_next = &head;
+    BlockJobInfoList *head = NULL, **tail = &head;
     BlockJob *job;
 
     for (job = block_job_next(NULL); job; job = block_job_next(job)) {
-        BlockJobInfoList *elem;
+        BlockJobInfo *value;
         AioContext *aio_context;
 
         if (block_job_is_internal(job)) {
             continue;
         }
-        elem = g_new0(BlockJobInfoList, 1);
         aio_context = blk_get_aio_context(job->blk);
         aio_context_acquire(aio_context);
-        elem->value = block_job_query(job, errp);
+        value = block_job_query(job, errp);
         aio_context_release(aio_context);
-        if (!elem->value) {
-            g_free(elem);
+        if (!value) {
             qapi_free_BlockJobInfoList(head);
             return NULL;
         }
-        *p_next = elem;
-        p_next = &elem->next;
+        QAPI_LIST_APPEND(tail, value);
     }
 
     return head;

crypto/block-luks.c

@@ -1885,7 +1885,7 @@ static int qcrypto_block_luks_get_info(QCryptoBlock *block,
 {
     QCryptoBlockLUKS *luks = block->opaque;
     QCryptoBlockInfoLUKSSlot *slot;
-    QCryptoBlockInfoLUKSSlotList *slots = NULL, **prev = &info->u.luks.slots;
+    QCryptoBlockInfoLUKSSlotList **tail = &info->u.luks.slots;
     size_t i;
 
     info->u.luks.cipher_alg = luks->cipher_alg;
@@ -1902,10 +1902,7 @@ static int qcrypto_block_luks_get_info(QCryptoBlock *block,
                                   sizeof(luks->header.uuid));
 
     for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
-        slots = g_new0(QCryptoBlockInfoLUKSSlotList, 1);
-        *prev = slots;
-
-        slots->value = slot = g_new0(QCryptoBlockInfoLUKSSlot, 1);
+        slot = g_new0(QCryptoBlockInfoLUKSSlot, 1);
         slot->active = luks->header.key_slots[i].active ==
             QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED;
         slot->key_offset = luks->header.key_slots[i].key_offset_sector
@@ -1917,7 +1914,7 @@ static int qcrypto_block_luks_get_info(QCryptoBlock *block,
             slot->stripes = luks->header.key_slots[i].stripes;
         }
 
-        prev = &slots->next;
+        QAPI_LIST_APPEND(tail, slot);
     }
 
     return 0;

hw/acpi/cpu.c

@@ -44,14 +44,11 @@ static ACPIOSTInfo *acpi_cpu_device_status(int idx, AcpiCpuStatus *cdev)
 
 void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list)
 {
+    ACPIOSTInfoList ***tail = list;
     int i;
 
     for (i = 0; i < cpu_st->dev_count; i++) {
-        ACPIOSTInfoList *elem = g_new0(ACPIOSTInfoList, 1);
-        elem->value = acpi_cpu_device_status(i, &cpu_st->devs[i]);
-        elem->next = NULL;
-        **list = elem;
-        *list = &elem->next;
+        QAPI_LIST_APPEND(*tail, acpi_cpu_device_status(i, &cpu_st->devs[i]));
     }
 }
 

hw/acpi/memory_hotplug.c

@@ -53,14 +53,12 @@ static ACPIOSTInfo *acpi_memory_device_status(int slot, MemStatus *mdev)
 
 void acpi_memory_ospm_status(MemHotplugState *mem_st, ACPIOSTInfoList ***list)
 {
+    ACPIOSTInfoList ***tail = list;
     int i;
 
     for (i = 0; i < mem_st->dev_count; i++) {
-        ACPIOSTInfoList *elem = g_new0(ACPIOSTInfoList, 1);
-        elem->value = acpi_memory_device_status(i, &mem_st->devs[i]);
-        elem->next = NULL;
-        **list = elem;
-        *list = &elem->next;
+        QAPI_LIST_APPEND(*tail,
+                         acpi_memory_device_status(i, &mem_st->devs[i]));
     }
 }
 

iothread.c

@@ -1,7 +1,7 @@
 /*
  * Event loop thread
  *
- * Copyright Red Hat Inc., 2013
+ * Copyright Red Hat Inc., 2013, 2020
  *
  * Authors:
  *  Stefan Hajnoczi   <stefanha@redhat.com>
@@ -310,8 +310,7 @@ AioContext *iothread_get_aio_context(IOThread *iothread)
 
 static int query_one_iothread(Object *object, void *opaque)
 {
-    IOThreadInfoList ***prev = opaque;
-    IOThreadInfoList *elem;
+    IOThreadInfoList ***tail = opaque;
     IOThreadInfo *info;
     IOThread *iothread;
 
@@ -327,12 +326,7 @@ static int query_one_iothread(Object *object, void *opaque)
     info->poll_grow = iothread->poll_grow;
     info->poll_shrink = iothread->poll_shrink;
 
-    elem = g_new0(IOThreadInfoList, 1);
-    elem->value = info;
-    elem->next = NULL;
-
-    **prev = elem;
-    *prev = &elem->next;
+    QAPI_LIST_APPEND(*tail, info);
     return 0;
 }
 

job-qmp.c

@@ -164,28 +164,25 @@ static JobInfo *job_query_single(Job *job, Error **errp)
 
 JobInfoList *qmp_query_jobs(Error **errp)
 {
-    JobInfoList *head = NULL, **p_next = &head;
+    JobInfoList *head = NULL, **tail = &head;
     Job *job;
 
     for (job = job_next(NULL); job; job = job_next(job)) {
-        JobInfoList *elem;
+        JobInfo *value;
         AioContext *aio_context;
 
         if (job_is_internal(job)) {
             continue;
         }
-        elem = g_new0(JobInfoList, 1);
         aio_context = job->aio_context;
         aio_context_acquire(aio_context);
-        elem->value = job_query_single(job, errp);
+        value = job_query_single(job, errp);
         aio_context_release(aio_context);
-        if (!elem->value) {
-            g_free(elem);
+        if (!value) {
             qapi_free_JobInfoList(head);
             return NULL;
         }
-        *p_next = elem;
-        p_next = &elem->next;
+        QAPI_LIST_APPEND(tail, value);
     }
 
     return head;