Re: [Qemu-devel] [PATCH v4 17/17] aio: drop io_flush argument

[Paolo Bonzini <pbonzini@redhat.com>]

Il 14/06/2013 13:44, Stefan Hajnoczi ha scritto:
> The .io_flush() handler no longer exists and has no users.  Drop the
> io_flush argument to aio_set_fd_handler() and related functions.
> 
> The AioFlushEventNotifierHandler and AioFlushHandler typedefs are no
> longer used and are dropped too.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  aio-posix.c                     |  7 ++-----
>  aio-win32.c                     |  3 +--
>  async.c                         |  4 ++--
>  block/curl.c                    |  9 ++++-----
>  block/gluster.c                 |  7 +++----
>  block/iscsi.c                   |  3 +--
>  block/linux-aio.c               |  3 +--
>  block/nbd.c                     | 11 ++++-------
>  block/rbd.c                     |  4 ++--
>  block/sheepdog.c                | 18 ++++++++----------
>  block/ssh.c                     |  4 ++--
>  hw/block/dataplane/virtio-blk.c |  8 ++++----
>  include/block/aio.h             | 14 ++------------
>  main-loop.c                     |  9 +++------
>  tests/test-aio.c                | 40 ++++++++++++++++++++--------------------
>  thread-pool.c                   |  5 ++---
>  16 files changed, 61 insertions(+), 88 deletions(-)
> 
> diff --git a/aio-posix.c b/aio-posix.c
> index 7d66048..2440eb9 100644
> --- a/aio-posix.c
> +++ b/aio-posix.c
> @@ -46,7 +46,6 @@ void aio_set_fd_handler(AioContext *ctx,
>                          int fd,
>                          IOHandler *io_read,
>                          IOHandler *io_write,
> -                        AioFlushHandler *io_flush,
>                          void *opaque)
>  {
>      AioHandler *node;
> @@ -95,12 +94,10 @@ void aio_set_fd_handler(AioContext *ctx,
>  
>  void aio_set_event_notifier(AioContext *ctx,
>                              EventNotifier *notifier,
> -                            EventNotifierHandler *io_read,
> -                            AioFlushEventNotifierHandler *io_flush)
> +                            EventNotifierHandler *io_read)
>  {
>      aio_set_fd_handler(ctx, event_notifier_get_fd(notifier),
> -                       (IOHandler *)io_read, NULL,
> -                       (AioFlushHandler *)io_flush, notifier);
> +                       (IOHandler *)io_read, NULL, notifier);
>  }
>  
>  bool aio_pending(AioContext *ctx)
> diff --git a/aio-win32.c b/aio-win32.c
> index 4309c16..78b2801 100644
> --- a/aio-win32.c
> +++ b/aio-win32.c
> @@ -30,8 +30,7 @@ struct AioHandler {
>  
>  void aio_set_event_notifier(AioContext *ctx,
>                              EventNotifier *e,
> -                            EventNotifierHandler *io_notify,
> -                            AioFlushEventNotifierHandler *io_flush)
> +                            EventNotifierHandler *io_notify)
>  {
>      AioHandler *node;
>  
> diff --git a/async.c b/async.c
> index 90fe906..fe2c8bf 100644
> --- a/async.c
> +++ b/async.c
> @@ -174,7 +174,7 @@ aio_ctx_finalize(GSource     *source)
>      AioContext *ctx = (AioContext *) source;
>  
>      thread_pool_free(ctx->thread_pool);
> -    aio_set_event_notifier(ctx, &ctx->notifier, NULL, NULL);
> +    aio_set_event_notifier(ctx, &ctx->notifier, NULL);
>      event_notifier_cleanup(&ctx->notifier);
>      g_array_free(ctx->pollfds, TRUE);
>  }
> @@ -214,7 +214,7 @@ AioContext *aio_context_new(void)
>      event_notifier_init(&ctx->notifier, false);
>      aio_set_event_notifier(ctx, &ctx->notifier, 
>                             (EventNotifierHandler *)
> -                           event_notifier_test_and_clear, NULL);
> +                           event_notifier_test_and_clear);
>  
>      return ctx;
>  }
> diff --git a/block/curl.c b/block/curl.c
> index 2147076..e88621a 100644
> --- a/block/curl.c
> +++ b/block/curl.c
> @@ -92,17 +92,16 @@ static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
>      DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
>      switch (action) {
>          case CURL_POLL_IN:
> -            qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, NULL, s);
> +            qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, s);
>              break;
>          case CURL_POLL_OUT:
> -            qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, NULL, s);
> +            qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, s);
>              break;
>          case CURL_POLL_INOUT:
> -            qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do,
> -                                    NULL, s);
> +            qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do, s);
>              break;
>          case CURL_POLL_REMOVE:
> -            qemu_aio_set_fd_handler(fd, NULL, NULL, NULL, NULL);
> +            qemu_aio_set_fd_handler(fd, NULL, NULL, NULL);
>              break;
>      }
>  
> diff --git a/block/gluster.c b/block/gluster.c
> index 7a69a12..3cff308 100644
> --- a/block/gluster.c
> +++ b/block/gluster.c
> @@ -339,7 +339,7 @@ static int qemu_gluster_open(BlockDriverState *bs,  QDict *options,
>      }
>      fcntl(s->fds[GLUSTER_FD_READ], F_SETFL, O_NONBLOCK);
>      qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ],
> -        qemu_gluster_aio_event_reader, NULL, NULL, s);
> +        qemu_gluster_aio_event_reader, NULL, s);
>  
>  out:
>      qemu_opts_del(opts);
> @@ -438,8 +438,7 @@ static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
>          qemu_aio_release(acb);
>          close(s->fds[GLUSTER_FD_READ]);
>          close(s->fds[GLUSTER_FD_WRITE]);
> -        qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL,
> -            NULL);
> +        qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL);
>          bs->drv = NULL; /* Make the disk inaccessible */
>          qemu_mutex_unlock_iothread();
>      }
> @@ -551,7 +550,7 @@ static void qemu_gluster_close(BlockDriverState *bs)
>  
>      close(s->fds[GLUSTER_FD_READ]);
>      close(s->fds[GLUSTER_FD_WRITE]);
> -    qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL);
>  
>      if (s->fd) {
>          glfs_close(s->fd);
> diff --git a/block/iscsi.c b/block/iscsi.c
> index e2041ca..721c7d9 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -160,7 +160,6 @@ iscsi_set_events(IscsiLun *iscsilun)
>          qemu_aio_set_fd_handler(iscsi_get_fd(iscsi),
>                        iscsi_process_read,
>                        (ev & POLLOUT) ? iscsi_process_write : NULL,
> -                      NULL,
>                        iscsilun);
>  
>      }
> @@ -1176,7 +1175,7 @@ static void iscsi_close(BlockDriverState *bs)
>          qemu_del_timer(iscsilun->nop_timer);
>          qemu_free_timer(iscsilun->nop_timer);
>      }
> -    qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL);
>      iscsi_destroy_context(iscsi);
>      memset(iscsilun, 0, sizeof(IscsiLun));
>  }
> diff --git a/block/linux-aio.c b/block/linux-aio.c
> index d9128f3..53434e2 100644
> --- a/block/linux-aio.c
> +++ b/block/linux-aio.c
> @@ -190,8 +190,7 @@ void *laio_init(void)
>          goto out_close_efd;
>      }
>  
> -    qemu_aio_set_event_notifier(&s->e, qemu_laio_completion_cb,
> -                                NULL);
> +    qemu_aio_set_event_notifier(&s->e, qemu_laio_completion_cb);
>  
>      return s;
>  
> diff --git a/block/nbd.c b/block/nbd.c
> index 80d2b31..f5350fb 100644
> --- a/block/nbd.c
> +++ b/block/nbd.c
> @@ -325,8 +325,7 @@ static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
>  
>      qemu_co_mutex_lock(&s->send_mutex);
>      s->send_coroutine = qemu_coroutine_self();
> -    qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write,
> -                            NULL, s);
> +    qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write, s);
>      if (qiov) {
>          if (!s->is_unix) {
>              socket_set_cork(s->sock, 1);
> @@ -345,8 +344,7 @@ static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
>      } else {
>          rc = nbd_send_request(s->sock, request);
>      }
> -    qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL,
> -                            NULL, s);
> +    qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL, s);
>      s->send_coroutine = NULL;
>      qemu_co_mutex_unlock(&s->send_mutex);
>      return rc;
> @@ -422,8 +420,7 @@ static int nbd_establish_connection(BlockDriverState *bs)
>      /* Now that we're connected, set the socket to be non-blocking and
>       * kick the reply mechanism.  */
>      qemu_set_nonblock(sock);
> -    qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL,
> -                            NULL, s);
> +    qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL, s);
>  
>      s->sock = sock;
>      s->size = size;
> @@ -443,7 +440,7 @@ static void nbd_teardown_connection(BlockDriverState *bs)
>      request.len = 0;
>      nbd_send_request(s->sock, &request);
>  
> -    qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL);
>      closesocket(s->sock);
>  }
>  
> diff --git a/block/rbd.c b/block/rbd.c
> index 40e5d55..78b8564 100644
> --- a/block/rbd.c
> +++ b/block/rbd.c
> @@ -545,7 +545,7 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags)
>      fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
>      fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
>      qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader,
> -                            NULL, NULL, s);
> +                            NULL, s);
>  
>  
>      qemu_opts_del(opts);
> @@ -569,7 +569,7 @@ static void qemu_rbd_close(BlockDriverState *bs)
>  
>      close(s->fds[0]);
>      close(s->fds[1]);
> -    qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL);
>  
>      rbd_close(s->image);
>      rados_ioctx_destroy(s->io_ctx);
> diff --git a/block/sheepdog.c b/block/sheepdog.c
> index 66918c6..be2a876 100644
> --- a/block/sheepdog.c
> +++ b/block/sheepdog.c
> @@ -531,14 +531,14 @@ static coroutine_fn void do_co_req(void *opaque)
>      unsigned int *rlen = srco->rlen;
>  
>      co = qemu_coroutine_self();
> -    qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, NULL, co);
> +    qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, co);
>  
>      ret = send_co_req(sockfd, hdr, data, wlen);
>      if (ret < 0) {
>          goto out;
>      }
>  
> -    qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, NULL, co);
> +    qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, co);
>  
>      ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
>      if (ret < sizeof(*hdr)) {
> @@ -563,7 +563,7 @@ static coroutine_fn void do_co_req(void *opaque)
>  out:
>      /* there is at most one request for this sockfd, so it is safe to
>       * set each handler to NULL. */
> -    qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL);
>  
>      srco->ret = ret;
>      srco->finished = true;
> @@ -804,7 +804,7 @@ static int get_sheep_fd(BDRVSheepdogState *s)
>          return fd;
>      }
>  
> -    qemu_aio_set_fd_handler(fd, co_read_response, NULL, NULL, s);
> +    qemu_aio_set_fd_handler(fd, co_read_response, NULL, s);
>      return fd;
>  }
>  
> @@ -1054,8 +1054,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
>  
>      qemu_co_mutex_lock(&s->lock);
>      s->co_send = qemu_coroutine_self();
> -    qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request,
> -                            NULL, s);
> +    qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request, s);
>      socket_set_cork(s->fd, 1);
>  
>      /* send a header */
> @@ -1076,8 +1075,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
>      }
>  
>      socket_set_cork(s->fd, 0);
> -    qemu_aio_set_fd_handler(s->fd, co_read_response, NULL,
> -                            NULL, s);
> +    qemu_aio_set_fd_handler(s->fd, co_read_response, NULL, s);
>      qemu_co_mutex_unlock(&s->lock);
>  
>      return 0;
> @@ -1335,7 +1333,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags)
>      g_free(buf);
>      return 0;
>  out:
> -    qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL);
>      if (s->fd >= 0) {
>          closesocket(s->fd);
>      }
> @@ -1563,7 +1561,7 @@ static void sd_close(BlockDriverState *bs)
>          error_report("%s, %s", sd_strerror(rsp->result), s->name);
>      }
>  
> -    qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL);
>      closesocket(s->fd);
>      g_free(s->host_spec);
>  }
> diff --git a/block/ssh.c b/block/ssh.c
> index ed525cc..b78253f 100644
> --- a/block/ssh.c
> +++ b/block/ssh.c
> @@ -743,13 +743,13 @@ static coroutine_fn void set_fd_handler(BDRVSSHState *s)
>      DPRINTF("s->sock=%d rd_handler=%p wr_handler=%p", s->sock,
>              rd_handler, wr_handler);
>  
> -    qemu_aio_set_fd_handler(s->sock, rd_handler, wr_handler, NULL, co);
> +    qemu_aio_set_fd_handler(s->sock, rd_handler, wr_handler, co);
>  }
>  
>  static coroutine_fn void clear_fd_handler(BDRVSSHState *s)
>  {
>      DPRINTF("s->sock=%d", s->sock);
> -    qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL);
> +    qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL);
>  }
>  
>  /* A non-blocking call returned EAGAIN, so yield, ensuring the
> diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
> index 9e6d32b..bd1b51a 100644
> --- a/hw/block/dataplane/virtio-blk.c
> +++ b/hw/block/dataplane/virtio-blk.c
> @@ -473,7 +473,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
>          exit(1);
>      }
>      s->host_notifier = *virtio_queue_get_host_notifier(vq);
> -    aio_set_event_notifier(s->ctx, &s->host_notifier, handle_notify, NULL);
> +    aio_set_event_notifier(s->ctx, &s->host_notifier, handle_notify);
>  
>      /* Set up ioqueue */
>      ioq_init(&s->ioqueue, s->fd, REQ_MAX);
> @@ -481,7 +481,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
>          ioq_put_iocb(&s->ioqueue, &s->requests[i].iocb);
>      }
>      s->io_notifier = *ioq_get_notifier(&s->ioqueue);
> -    aio_set_event_notifier(s->ctx, &s->io_notifier, handle_io, NULL);
> +    aio_set_event_notifier(s->ctx, &s->io_notifier, handle_io);
>  
>      s->started = true;
>      trace_virtio_blk_data_plane_start(s);
> @@ -513,10 +513,10 @@ void virtio_blk_data_plane_stop(VirtIOBlockDataPlane *s)
>          qemu_thread_join(&s->thread);
>      }
>  
> -    aio_set_event_notifier(s->ctx, &s->io_notifier, NULL, NULL);
> +    aio_set_event_notifier(s->ctx, &s->io_notifier, NULL);
>      ioq_cleanup(&s->ioqueue);
>  
> -    aio_set_event_notifier(s->ctx, &s->host_notifier, NULL, NULL);
> +    aio_set_event_notifier(s->ctx, &s->host_notifier, NULL);
>      k->set_host_notifier(qbus->parent, 0, false);
>  
>      aio_context_unref(s->ctx);
> diff --git a/include/block/aio.h b/include/block/aio.h
> index 1836793..e17066b 100644
> --- a/include/block/aio.h
> +++ b/include/block/aio.h
> @@ -71,9 +71,6 @@ typedef struct AioContext {
>      struct ThreadPool *thread_pool;
>  } AioContext;
>  
> -/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
> -typedef int (AioFlushEventNotifierHandler)(EventNotifier *e);
> -
>  /**
>   * aio_context_new: Allocate a new AioContext.
>   *
> @@ -191,9 +188,6 @@ bool aio_pending(AioContext *ctx);
>  bool aio_poll(AioContext *ctx, bool blocking);
>  
>  #ifdef CONFIG_POSIX
> -/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
> -typedef int (AioFlushHandler)(void *opaque);
> -
>  /* Register a file descriptor and associated callbacks.  Behaves very similarly
>   * to qemu_set_fd_handler2.  Unlike qemu_set_fd_handler2, these callbacks will
>   * be invoked when using qemu_aio_wait().
> @@ -205,7 +199,6 @@ void aio_set_fd_handler(AioContext *ctx,
>                          int fd,
>                          IOHandler *io_read,
>                          IOHandler *io_write,
> -                        AioFlushHandler *io_flush,
>                          void *opaque);
>  #endif
>  
> @@ -218,8 +211,7 @@ void aio_set_fd_handler(AioContext *ctx,
>   */
>  void aio_set_event_notifier(AioContext *ctx,
>                              EventNotifier *notifier,
> -                            EventNotifierHandler *io_read,
> -                            AioFlushEventNotifierHandler *io_flush);
> +                            EventNotifierHandler *io_read);
>  
>  /* Return a GSource that lets the main loop poll the file descriptors attached
>   * to this AioContext.
> @@ -233,14 +225,12 @@ struct ThreadPool *aio_get_thread_pool(AioContext *ctx);
>  
>  bool qemu_aio_wait(void);
>  void qemu_aio_set_event_notifier(EventNotifier *notifier,
> -                                 EventNotifierHandler *io_read,
> -                                 AioFlushEventNotifierHandler *io_flush);
> +                                 EventNotifierHandler *io_read);
>  
>  #ifdef CONFIG_POSIX
>  void qemu_aio_set_fd_handler(int fd,
>                               IOHandler *io_read,
>                               IOHandler *io_write,
> -                             AioFlushHandler *io_flush,
>                               void *opaque);
>  #endif
>  
> diff --git a/main-loop.c b/main-loop.c
> index cf36645..2581939 100644
> --- a/main-loop.c
> +++ b/main-loop.c
> @@ -488,17 +488,14 @@ bool qemu_aio_wait(void)
>  void qemu_aio_set_fd_handler(int fd,
>                               IOHandler *io_read,
>                               IOHandler *io_write,
> -                             AioFlushHandler *io_flush,
>                               void *opaque)
>  {
> -    aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush,
> -                       opaque);
> +    aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, opaque);
>  }
>  #endif
>  
>  void qemu_aio_set_event_notifier(EventNotifier *notifier,
> -                                 EventNotifierHandler *io_read,
> -                                 AioFlushEventNotifierHandler *io_flush)
> +                                 EventNotifierHandler *io_read)
>  {
> -    aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush);
> +    aio_set_event_notifier(qemu_aio_context, notifier, io_read);
>  }
> diff --git a/tests/test-aio.c b/tests/test-aio.c
> index 7b2892a..1ab5637 100644
> --- a/tests/test-aio.c
> +++ b/tests/test-aio.c
> @@ -233,11 +233,11 @@ static void test_set_event_notifier(void)
>  {
>      EventNotifierTestData data = { .n = 0, .active = 0 };
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 0);
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 0);
>      event_notifier_cleanup(&data.e);
> @@ -247,7 +247,7 @@ static void test_wait_event_notifier(void)
>  {
>      EventNotifierTestData data = { .n = 0, .active = 1 };
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 0);
>      g_assert_cmpint(data.active, ==, 1);
> @@ -261,7 +261,7 @@ static void test_wait_event_notifier(void)
>      g_assert_cmpint(data.n, ==, 1);
>      g_assert_cmpint(data.active, ==, 0);
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 1);
>  
> @@ -272,7 +272,7 @@ static void test_flush_event_notifier(void)
>  {
>      EventNotifierTestData data = { .n = 0, .active = 10, .auto_set = true };
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 0);
>      g_assert_cmpint(data.active, ==, 10);
> @@ -288,7 +288,7 @@ static void test_flush_event_notifier(void)
>      g_assert_cmpint(data.active, ==, 0);
>      g_assert(!aio_poll(ctx, false));
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      g_assert(!aio_poll(ctx, false));
>      event_notifier_cleanup(&data.e);
>  }
> @@ -299,7 +299,7 @@ static void test_wait_event_notifier_noflush(void)
>      EventNotifierTestData dummy = { .n = 0, .active = 1 };
>  
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>  
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 0);
> @@ -312,7 +312,7 @@ static void test_wait_event_notifier_noflush(void)
>  
>      /* An active event notifier forces aio_poll to look at EventNotifiers.  */
>      event_notifier_init(&dummy.e, false);
> -    aio_set_event_notifier(ctx, &dummy.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &dummy.e, event_ready_cb);
>  
>      event_notifier_set(&data.e);
>      g_assert(aio_poll(ctx, false));
> @@ -332,10 +332,10 @@ static void test_wait_event_notifier_noflush(void)
>      g_assert_cmpint(dummy.n, ==, 1);
>      g_assert_cmpint(dummy.active, ==, 0);
>  
> -    aio_set_event_notifier(ctx, &dummy.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &dummy.e, NULL);
>      event_notifier_cleanup(&dummy.e);
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      g_assert(!aio_poll(ctx, false));
>      g_assert_cmpint(data.n, ==, 2);
>  
> @@ -515,11 +515,11 @@ static void test_source_set_event_notifier(void)
>  {
>      EventNotifierTestData data = { .n = 0, .active = 0 };
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>      while (g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 0);
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      while (g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 0);
>      event_notifier_cleanup(&data.e);
> @@ -529,7 +529,7 @@ static void test_source_wait_event_notifier(void)
>  {
>      EventNotifierTestData data = { .n = 0, .active = 1 };
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>      g_assert(g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 0);
>      g_assert_cmpint(data.active, ==, 1);
> @@ -543,7 +543,7 @@ static void test_source_wait_event_notifier(void)
>      g_assert_cmpint(data.n, ==, 1);
>      g_assert_cmpint(data.active, ==, 0);
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      while (g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 1);
>  
> @@ -554,7 +554,7 @@ static void test_source_flush_event_notifier(void)
>  {
>      EventNotifierTestData data = { .n = 0, .active = 10, .auto_set = true };
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>      g_assert(g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 0);
>      g_assert_cmpint(data.active, ==, 10);
> @@ -570,7 +570,7 @@ static void test_source_flush_event_notifier(void)
>      g_assert_cmpint(data.active, ==, 0);
>      g_assert(!g_main_context_iteration(NULL, false));
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      while (g_main_context_iteration(NULL, false));
>      event_notifier_cleanup(&data.e);
>  }
> @@ -581,7 +581,7 @@ static void test_source_wait_event_notifier_noflush(void)
>      EventNotifierTestData dummy = { .n = 0, .active = 1 };
>  
>      event_notifier_init(&data.e, false);
> -    aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &data.e, event_ready_cb);
>  
>      while (g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 0);
> @@ -594,7 +594,7 @@ static void test_source_wait_event_notifier_noflush(void)
>  
>      /* An active event notifier forces aio_poll to look at EventNotifiers.  */
>      event_notifier_init(&dummy.e, false);
> -    aio_set_event_notifier(ctx, &dummy.e, event_ready_cb, NULL);
> +    aio_set_event_notifier(ctx, &dummy.e, event_ready_cb);
>  
>      event_notifier_set(&data.e);
>      g_assert(g_main_context_iteration(NULL, false));
> @@ -614,10 +614,10 @@ static void test_source_wait_event_notifier_noflush(void)
>      g_assert_cmpint(dummy.n, ==, 1);
>      g_assert_cmpint(dummy.active, ==, 0);
>  
> -    aio_set_event_notifier(ctx, &dummy.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &dummy.e, NULL);
>      event_notifier_cleanup(&dummy.e);
>  
> -    aio_set_event_notifier(ctx, &data.e, NULL, NULL);
> +    aio_set_event_notifier(ctx, &data.e, NULL);
>      while (g_main_context_iteration(NULL, false));
>      g_assert_cmpint(data.n, ==, 2);
>  
> diff --git a/thread-pool.c b/thread-pool.c
> index 096f007..5025567 100644
> --- a/thread-pool.c
> +++ b/thread-pool.c
> @@ -303,8 +303,7 @@ static void thread_pool_init_one(ThreadPool *pool, AioContext *ctx)
>      QLIST_INIT(&pool->head);
>      QTAILQ_INIT(&pool->request_list);
>  
> -    aio_set_event_notifier(ctx, &pool->notifier, event_notifier_ready,
> -                           NULL);
> +    aio_set_event_notifier(ctx, &pool->notifier, event_notifier_ready);
>  }
>  
>  ThreadPool *thread_pool_new(AioContext *ctx)
> @@ -338,7 +337,7 @@ void thread_pool_free(ThreadPool *pool)
>  
>      qemu_mutex_unlock(&pool->lock);
>  
> -    aio_set_event_notifier(pool->ctx, &pool->notifier, NULL, NULL);
> +    aio_set_event_notifier(pool->ctx, &pool->notifier, NULL);
>      qemu_sem_destroy(&pool->sem);
>      qemu_cond_destroy(&pool->check_cancel);
>      qemu_cond_destroy(&pool->worker_stopped);
> 

Yay!

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

Paolo