Re: [PATCH v2 2/4] eventfd: simplify eventfd_signal()

[Anthony Krowiak <akrowiak@linux.ibm.com>]

For vfio_ap_ops.c

Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>

On 2/6/24 2:44 PM, Stefan Hajnoczi wrote:
> vhost and VIRTIO-related parts:
>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
>
> On Wed, 22 Nov 2023 at 07:50, Christian Brauner <brauner@kernel.org> wrote:
>> Ever since the evenfd type was introduced back in 2007 in commit
>> e1ad7468c77d ("signal/timer/event: eventfd core") the eventfd_signal()
>> function only ever passed 1 as a value for @n. There's no point in
>> keeping that additional argument.
>>
>> Signed-off-by: Christian Brauner <brauner@kernel.org>
>> ---
>>   arch/x86/kvm/hyperv.c                     |  2 +-
>>   arch/x86/kvm/xen.c                        |  2 +-
>>   drivers/accel/habanalabs/common/device.c  |  2 +-
>>   drivers/fpga/dfl.c                        |  2 +-
>>   drivers/gpu/drm/drm_syncobj.c             |  6 +++---
>>   drivers/gpu/drm/i915/gvt/interrupt.c      |  2 +-
>>   drivers/infiniband/hw/mlx5/devx.c         |  2 +-
>>   drivers/misc/ocxl/file.c                  |  2 +-
>>   drivers/s390/cio/vfio_ccw_chp.c           |  2 +-
>>   drivers/s390/cio/vfio_ccw_drv.c           |  4 ++--
>>   drivers/s390/cio/vfio_ccw_ops.c           |  6 +++---
>>   drivers/s390/crypto/vfio_ap_ops.c         |  2 +-
>>   drivers/usb/gadget/function/f_fs.c        |  4 ++--
>>   drivers/vdpa/vdpa_user/vduse_dev.c        |  6 +++---
>>   drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c    |  2 +-
>>   drivers/vfio/pci/vfio_pci_core.c          |  6 +++---
>>   drivers/vfio/pci/vfio_pci_intrs.c         | 12 ++++++------
>>   drivers/vfio/platform/vfio_platform_irq.c |  4 ++--
>>   drivers/vhost/vdpa.c                      |  4 ++--
>>   drivers/vhost/vhost.c                     | 10 +++++-----
>>   drivers/vhost/vhost.h                     |  2 +-
>>   drivers/virt/acrn/ioeventfd.c             |  2 +-
>>   drivers/xen/privcmd.c                     |  2 +-
>>   fs/aio.c                                  |  2 +-
>>   fs/eventfd.c                              |  9 +++------
>>   include/linux/eventfd.h                   |  4 ++--
>>   mm/memcontrol.c                           | 10 +++++-----
>>   mm/vmpressure.c                           |  2 +-
>>   samples/vfio-mdev/mtty.c                  |  4 ++--
>>   virt/kvm/eventfd.c                        |  4 ++--
>>   30 files changed, 60 insertions(+), 63 deletions(-)
>>
>> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
>> index 238afd7335e4..4943f6b2bbee 100644
>> --- a/arch/x86/kvm/hyperv.c
>> +++ b/arch/x86/kvm/hyperv.c
>> @@ -2388,7 +2388,7 @@ static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *h
>>          if (!eventfd)
>>                  return HV_STATUS_INVALID_PORT_ID;
>>
>> -       eventfd_signal(eventfd, 1);
>> +       eventfd_signal(eventfd);
>>          return HV_STATUS_SUCCESS;
>>   }
>>
>> diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
>> index e53fad915a62..523bb6df5ac9 100644
>> --- a/arch/x86/kvm/xen.c
>> +++ b/arch/x86/kvm/xen.c
>> @@ -2088,7 +2088,7 @@ static bool kvm_xen_hcall_evtchn_send(struct kvm_vcpu *vcpu, u64 param, u64 *r)
>>                  if (ret < 0 && ret != -ENOTCONN)
>>                          return false;
>>          } else {
>> -               eventfd_signal(evtchnfd->deliver.eventfd.ctx, 1);
>> +               eventfd_signal(evtchnfd->deliver.eventfd.ctx);
>>          }
>>
>>          *r = 0;
>> diff --git a/drivers/accel/habanalabs/common/device.c b/drivers/accel/habanalabs/common/device.c
>> index 9711e8fc979d..3a89644f087c 100644
>> --- a/drivers/accel/habanalabs/common/device.c
>> +++ b/drivers/accel/habanalabs/common/device.c
>> @@ -2044,7 +2044,7 @@ static void hl_notifier_event_send(struct hl_notifier_event *notifier_event, u64
>>          notifier_event->events_mask |= event_mask;
>>
>>          if (notifier_event->eventfd)
>> -               eventfd_signal(notifier_event->eventfd, 1);
>> +               eventfd_signal(notifier_event->eventfd);
>>
>>          mutex_unlock(&notifier_event->lock);
>>   }
>> diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
>> index dd7a783d53b5..e73f88050f08 100644
>> --- a/drivers/fpga/dfl.c
>> +++ b/drivers/fpga/dfl.c
>> @@ -1872,7 +1872,7 @@ static irqreturn_t dfl_irq_handler(int irq, void *arg)
>>   {
>>          struct eventfd_ctx *trigger = arg;
>>
>> -       eventfd_signal(trigger, 1);
>> +       eventfd_signal(trigger);
>>          return IRQ_HANDLED;
>>   }
>>
>> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
>> index 01da6789d044..b9cc62982196 100644
>> --- a/drivers/gpu/drm/drm_syncobj.c
>> +++ b/drivers/gpu/drm/drm_syncobj.c
>> @@ -1365,7 +1365,7 @@ static void syncobj_eventfd_entry_fence_func(struct dma_fence *fence,
>>          struct syncobj_eventfd_entry *entry =
>>                  container_of(cb, struct syncobj_eventfd_entry, fence_cb);
>>
>> -       eventfd_signal(entry->ev_fd_ctx, 1);
>> +       eventfd_signal(entry->ev_fd_ctx);
>>          syncobj_eventfd_entry_free(entry);
>>   }
>>
>> @@ -1388,13 +1388,13 @@ syncobj_eventfd_entry_func(struct drm_syncobj *syncobj,
>>          entry->fence = fence;
>>
>>          if (entry->flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) {
>> -               eventfd_signal(entry->ev_fd_ctx, 1);
>> +               eventfd_signal(entry->ev_fd_ctx);
>>                  syncobj_eventfd_entry_free(entry);
>>          } else {
>>                  ret = dma_fence_add_callback(fence, &entry->fence_cb,
>>                                               syncobj_eventfd_entry_fence_func);
>>                  if (ret == -ENOENT) {
>> -                       eventfd_signal(entry->ev_fd_ctx, 1);
>> +                       eventfd_signal(entry->ev_fd_ctx);
>>                          syncobj_eventfd_entry_free(entry);
>>                  }
>>          }
>> diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
>> index 9665876b4b13..7f4db438e400 100644
>> --- a/drivers/gpu/drm/i915/gvt/interrupt.c
>> +++ b/drivers/gpu/drm/i915/gvt/interrupt.c
>> @@ -454,7 +454,7 @@ static void inject_virtual_interrupt(struct intel_vgpu *vgpu)
>>                  return;
>>          if (!vgpu->msi_trigger)
>>                  return;
>> -       eventfd_signal(vgpu->msi_trigger, 1);
>> +       eventfd_signal(vgpu->msi_trigger);
>>   }
>>
>>   static void propagate_event(struct intel_gvt_irq *irq,
>> diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
>> index 8ba53edf2311..869369cb5b5f 100644
>> --- a/drivers/infiniband/hw/mlx5/devx.c
>> +++ b/drivers/infiniband/hw/mlx5/devx.c
>> @@ -2498,7 +2498,7 @@ static void dispatch_event_fd(struct list_head *fd_list,
>>
>>          list_for_each_entry_rcu(item, fd_list, xa_list) {
>>                  if (item->eventfd)
>> -                       eventfd_signal(item->eventfd, 1);
>> +                       eventfd_signal(item->eventfd);
>>                  else
>>                          deliver_event(item, data);
>>          }
>> diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
>> index ac69b7f361f5..7eb74711ac96 100644
>> --- a/drivers/misc/ocxl/file.c
>> +++ b/drivers/misc/ocxl/file.c
>> @@ -184,7 +184,7 @@ static irqreturn_t irq_handler(void *private)
>>   {
>>          struct eventfd_ctx *ev_ctx = private;
>>
>> -       eventfd_signal(ev_ctx, 1);
>> +       eventfd_signal(ev_ctx);
>>          return IRQ_HANDLED;
>>   }
>>
>> diff --git a/drivers/s390/cio/vfio_ccw_chp.c b/drivers/s390/cio/vfio_ccw_chp.c
>> index d3f3a611f95b..38c176cf6295 100644
>> --- a/drivers/s390/cio/vfio_ccw_chp.c
>> +++ b/drivers/s390/cio/vfio_ccw_chp.c
>> @@ -115,7 +115,7 @@ static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private,
>>
>>          /* Notify the guest if more CRWs are on our queue */
>>          if (!list_empty(&private->crw) && private->crw_trigger)
>> -               eventfd_signal(private->crw_trigger, 1);
>> +               eventfd_signal(private->crw_trigger);
>>
>>          return ret;
>>   }
>> diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
>> index 43601816ea4e..bfb35cfce1ef 100644
>> --- a/drivers/s390/cio/vfio_ccw_drv.c
>> +++ b/drivers/s390/cio/vfio_ccw_drv.c
>> @@ -112,7 +112,7 @@ void vfio_ccw_sch_io_todo(struct work_struct *work)
>>                  private->state = VFIO_CCW_STATE_IDLE;
>>
>>          if (private->io_trigger)
>> -               eventfd_signal(private->io_trigger, 1);
>> +               eventfd_signal(private->io_trigger);
>>   }
>>
>>   void vfio_ccw_crw_todo(struct work_struct *work)
>> @@ -122,7 +122,7 @@ void vfio_ccw_crw_todo(struct work_struct *work)
>>          private = container_of(work, struct vfio_ccw_private, crw_work);
>>
>>          if (!list_empty(&private->crw) && private->crw_trigger)
>> -               eventfd_signal(private->crw_trigger, 1);
>> +               eventfd_signal(private->crw_trigger);
>>   }
>>
>>   /*
>> diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
>> index cba4971618ff..ea532a8a4a0c 100644
>> --- a/drivers/s390/cio/vfio_ccw_ops.c
>> +++ b/drivers/s390/cio/vfio_ccw_ops.c
>> @@ -421,7 +421,7 @@ static int vfio_ccw_mdev_set_irqs(struct vfio_ccw_private *private,
>>          case VFIO_IRQ_SET_DATA_NONE:
>>          {
>>                  if (*ctx)
>> -                       eventfd_signal(*ctx, 1);
>> +                       eventfd_signal(*ctx);
>>                  return 0;
>>          }
>>          case VFIO_IRQ_SET_DATA_BOOL:
>> @@ -432,7 +432,7 @@ static int vfio_ccw_mdev_set_irqs(struct vfio_ccw_private *private,
>>                          return -EFAULT;
>>
>>                  if (trigger && *ctx)
>> -                       eventfd_signal(*ctx, 1);
>> +                       eventfd_signal(*ctx);
>>                  return 0;
>>          }
>>          case VFIO_IRQ_SET_DATA_EVENTFD:
>> @@ -612,7 +612,7 @@ static void vfio_ccw_mdev_request(struct vfio_device *vdev, unsigned int count)
>>                                                 "Relaying device request to user (#%u)\n",
>>                                                 count);
>>
>> -               eventfd_signal(private->req_trigger, 1);
>> +               eventfd_signal(private->req_trigger);
>>          } else if (count == 0) {
>>                  dev_notice(dev,
>>                             "No device request channel registered, blocked until released by user\n");
>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
>> index 4db538a55192..542b5be73a6a 100644
>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>> @@ -1794,7 +1794,7 @@ static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count)
>>                                                 "Relaying device request to user (#%u)\n",
>>                                                 count);
>>
>> -               eventfd_signal(matrix_mdev->req_trigger, 1);
>> +               eventfd_signal(matrix_mdev->req_trigger);
>>          } else if (count == 0) {
>>                  dev_notice(dev,
>>                             "No device request registered, blocked until released by user\n");
>> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
>> index efe3e3b85769..fdd0fc7b8f25 100644
>> --- a/drivers/usb/gadget/function/f_fs.c
>> +++ b/drivers/usb/gadget/function/f_fs.c
>> @@ -831,7 +831,7 @@ static void ffs_user_copy_worker(struct work_struct *work)
>>          io_data->kiocb->ki_complete(io_data->kiocb, ret);
>>
>>          if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd)
>> -               eventfd_signal(io_data->ffs->ffs_eventfd, 1);
>> +               eventfd_signal(io_data->ffs->ffs_eventfd);
>>
>>          if (io_data->read)
>>                  kfree(io_data->to_free);
>> @@ -2738,7 +2738,7 @@ static void __ffs_event_add(struct ffs_data *ffs,
>>          ffs->ev.types[ffs->ev.count++] = type;
>>          wake_up_locked(&ffs->ev.waitq);
>>          if (ffs->ffs_eventfd)
>> -               eventfd_signal(ffs->ffs_eventfd, 1);
>> +               eventfd_signal(ffs->ffs_eventfd);
>>   }
>>
>>   static void ffs_event_add(struct ffs_data *ffs,
>> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
>> index 0ddd4b8abecb..6cb5ce4a8b9a 100644
>> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
>> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
>> @@ -493,7 +493,7 @@ static void vduse_vq_kick(struct vduse_virtqueue *vq)
>>                  goto unlock;
>>
>>          if (vq->kickfd)
>> -               eventfd_signal(vq->kickfd, 1);
>> +               eventfd_signal(vq->kickfd);
>>          else
>>                  vq->kicked = true;
>>   unlock:
>> @@ -911,7 +911,7 @@ static int vduse_kickfd_setup(struct vduse_dev *dev,
>>                  eventfd_ctx_put(vq->kickfd);
>>          vq->kickfd = ctx;
>>          if (vq->ready && vq->kicked && vq->kickfd) {
>> -               eventfd_signal(vq->kickfd, 1);
>> +               eventfd_signal(vq->kickfd);
>>                  vq->kicked = false;
>>          }
>>          spin_unlock(&vq->kick_lock);
>> @@ -960,7 +960,7 @@ static bool vduse_vq_signal_irqfd(struct vduse_virtqueue *vq)
>>
>>          spin_lock_irq(&vq->irq_lock);
>>          if (vq->ready && vq->cb.trigger) {
>> -               eventfd_signal(vq->cb.trigger, 1);
>> +               eventfd_signal(vq->cb.trigger);
>>                  signal = true;
>>          }
>>          spin_unlock_irq(&vq->irq_lock);
>> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
>> index c51229fccbd6..d62fbfff20b8 100644
>> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
>> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
>> @@ -54,7 +54,7 @@ static irqreturn_t vfio_fsl_mc_irq_handler(int irq_num, void *arg)
>>   {
>>          struct vfio_fsl_mc_irq *mc_irq = (struct vfio_fsl_mc_irq *)arg;
>>
>> -       eventfd_signal(mc_irq->trigger, 1);
>> +       eventfd_signal(mc_irq->trigger);
>>          return IRQ_HANDLED;
>>   }
>>
>> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
>> index 1929103ee59a..1cbc990d42e0 100644
>> --- a/drivers/vfio/pci/vfio_pci_core.c
>> +++ b/drivers/vfio/pci/vfio_pci_core.c
>> @@ -443,7 +443,7 @@ static int vfio_pci_core_runtime_resume(struct device *dev)
>>           */
>>          down_write(&vdev->memory_lock);
>>          if (vdev->pm_wake_eventfd_ctx) {
>> -               eventfd_signal(vdev->pm_wake_eventfd_ctx, 1);
>> +               eventfd_signal(vdev->pm_wake_eventfd_ctx);
>>                  __vfio_pci_runtime_pm_exit(vdev);
>>          }
>>          up_write(&vdev->memory_lock);
>> @@ -1883,7 +1883,7 @@ void vfio_pci_core_request(struct vfio_device *core_vdev, unsigned int count)
>>                          pci_notice_ratelimited(pdev,
>>                                  "Relaying device request to user (#%u)\n",
>>                                  count);
>> -               eventfd_signal(vdev->req_trigger, 1);
>> +               eventfd_signal(vdev->req_trigger);
>>          } else if (count == 0) {
>>                  pci_warn(pdev,
>>                          "No device request channel registered, blocked until released by user\n");
>> @@ -2302,7 +2302,7 @@ pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev *pdev,
>>          mutex_lock(&vdev->igate);
>>
>>          if (vdev->err_trigger)
>> -               eventfd_signal(vdev->err_trigger, 1);
>> +               eventfd_signal(vdev->err_trigger);
>>
>>          mutex_unlock(&vdev->igate);
>>
>> diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
>> index cbb4bcbfbf83..237beac83809 100644
>> --- a/drivers/vfio/pci/vfio_pci_intrs.c
>> +++ b/drivers/vfio/pci/vfio_pci_intrs.c
>> @@ -94,7 +94,7 @@ static void vfio_send_intx_eventfd(void *opaque, void *unused)
>>                  ctx = vfio_irq_ctx_get(vdev, 0);
>>                  if (WARN_ON_ONCE(!ctx))
>>                          return;
>> -               eventfd_signal(ctx->trigger, 1);
>> +               eventfd_signal(ctx->trigger);
>>          }
>>   }
>>
>> @@ -342,7 +342,7 @@ static irqreturn_t vfio_msihandler(int irq, void *arg)
>>   {
>>          struct eventfd_ctx *trigger = arg;
>>
>> -       eventfd_signal(trigger, 1);
>> +       eventfd_signal(trigger);
>>          return IRQ_HANDLED;
>>   }
>>
>> @@ -689,11 +689,11 @@ static int vfio_pci_set_msi_trigger(struct vfio_pci_core_device *vdev,
>>                  if (!ctx)
>>                          continue;
>>                  if (flags & VFIO_IRQ_SET_DATA_NONE) {
>> -                       eventfd_signal(ctx->trigger, 1);
>> +                       eventfd_signal(ctx->trigger);
>>                  } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
>>                          uint8_t *bools = data;
>>                          if (bools[i - start])
>> -                               eventfd_signal(ctx->trigger, 1);
>> +                               eventfd_signal(ctx->trigger);
>>                  }
>>          }
>>          return 0;
>> @@ -707,7 +707,7 @@ static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
>>          if (flags & VFIO_IRQ_SET_DATA_NONE) {
>>                  if (*ctx) {
>>                          if (count) {
>> -                               eventfd_signal(*ctx, 1);
>> +                               eventfd_signal(*ctx);
>>                          } else {
>>                                  eventfd_ctx_put(*ctx);
>>                                  *ctx = NULL;
>> @@ -722,7 +722,7 @@ static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
>>
>>                  trigger = *(uint8_t *)data;
>>                  if (trigger && *ctx)
>> -                       eventfd_signal(*ctx, 1);
>> +                       eventfd_signal(*ctx);
>>
>>                  return 0;
>>          } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
>> diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
>> index 665197caed89..61a1bfb68ac7 100644
>> --- a/drivers/vfio/platform/vfio_platform_irq.c
>> +++ b/drivers/vfio/platform/vfio_platform_irq.c
>> @@ -155,7 +155,7 @@ static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
>>          spin_unlock_irqrestore(&irq_ctx->lock, flags);
>>
>>          if (ret == IRQ_HANDLED)
>> -               eventfd_signal(irq_ctx->trigger, 1);
>> +               eventfd_signal(irq_ctx->trigger);
>>
>>          return ret;
>>   }
>> @@ -164,7 +164,7 @@ static irqreturn_t vfio_irq_handler(int irq, void *dev_id)
>>   {
>>          struct vfio_platform_irq *irq_ctx = dev_id;
>>
>> -       eventfd_signal(irq_ctx->trigger, 1);
>> +       eventfd_signal(irq_ctx->trigger);
>>
>>          return IRQ_HANDLED;
>>   }
>> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
>> index 30df5c58db73..8d9f958946d6 100644
>> --- a/drivers/vhost/vdpa.c
>> +++ b/drivers/vhost/vdpa.c
>> @@ -178,7 +178,7 @@ static irqreturn_t vhost_vdpa_virtqueue_cb(void *private)
>>          struct eventfd_ctx *call_ctx = vq->call_ctx.ctx;
>>
>>          if (call_ctx)
>> -               eventfd_signal(call_ctx, 1);
>> +               eventfd_signal(call_ctx);
>>
>>          return IRQ_HANDLED;
>>   }
>> @@ -189,7 +189,7 @@ static irqreturn_t vhost_vdpa_config_cb(void *private)
>>          struct eventfd_ctx *config_ctx = v->config_ctx;
>>
>>          if (config_ctx)
>> -               eventfd_signal(config_ctx, 1);
>> +               eventfd_signal(config_ctx);
>>
>>          return IRQ_HANDLED;
>>   }
>> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
>> index e0c181ad17e3..045f666b4f12 100644
>> --- a/drivers/vhost/vhost.c
>> +++ b/drivers/vhost/vhost.c
>> @@ -2248,7 +2248,7 @@ int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
>>                  len -= l;
>>                  if (!len) {
>>                          if (vq->log_ctx)
>> -                               eventfd_signal(vq->log_ctx, 1);
>> +                               eventfd_signal(vq->log_ctx);
>>                          return 0;
>>                  }
>>          }
>> @@ -2271,7 +2271,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq)
>>                  log_used(vq, (used - (void __user *)vq->used),
>>                           sizeof vq->used->flags);
>>                  if (vq->log_ctx)
>> -                       eventfd_signal(vq->log_ctx, 1);
>> +                       eventfd_signal(vq->log_ctx);
>>          }
>>          return 0;
>>   }
>> @@ -2289,7 +2289,7 @@ static int vhost_update_avail_event(struct vhost_virtqueue *vq)
>>                  log_used(vq, (used - (void __user *)vq->used),
>>                           sizeof *vhost_avail_event(vq));
>>                  if (vq->log_ctx)
>> -                       eventfd_signal(vq->log_ctx, 1);
>> +                       eventfd_signal(vq->log_ctx);
>>          }
>>          return 0;
>>   }
>> @@ -2715,7 +2715,7 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads,
>>                  log_used(vq, offsetof(struct vring_used, idx),
>>                           sizeof vq->used->idx);
>>                  if (vq->log_ctx)
>> -                       eventfd_signal(vq->log_ctx, 1);
>> +                       eventfd_signal(vq->log_ctx);
>>          }
>>          return r;
>>   }
>> @@ -2763,7 +2763,7 @@ void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
>>   {
>>          /* Signal the Guest tell them we used something up. */
>>          if (vq->call_ctx.ctx && vhost_notify(dev, vq))
>> -               eventfd_signal(vq->call_ctx.ctx, 1);
>> +               eventfd_signal(vq->call_ctx.ctx);
>>   }
>>   EXPORT_SYMBOL_GPL(vhost_signal);
>>
>> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
>> index f60d5f7bef94..9e942fcda5c3 100644
>> --- a/drivers/vhost/vhost.h
>> +++ b/drivers/vhost/vhost.h
>> @@ -249,7 +249,7 @@ void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
>>   #define vq_err(vq, fmt, ...) do {                                  \
>>                  pr_debug(pr_fmt(fmt), ##__VA_ARGS__);       \
>>                  if ((vq)->error_ctx)                               \
>> -                               eventfd_signal((vq)->error_ctx, 1);\
>> +                               eventfd_signal((vq)->error_ctx);\
>>          } while (0)
>>
>>   enum {
>> diff --git a/drivers/virt/acrn/ioeventfd.c b/drivers/virt/acrn/ioeventfd.c
>> index ac4037e9f947..4e845c6ca0b5 100644
>> --- a/drivers/virt/acrn/ioeventfd.c
>> +++ b/drivers/virt/acrn/ioeventfd.c
>> @@ -223,7 +223,7 @@ static int acrn_ioeventfd_handler(struct acrn_ioreq_client *client,
>>          mutex_lock(&client->vm->ioeventfds_lock);
>>          p = hsm_ioeventfd_match(client->vm, addr, val, size, req->type);
>>          if (p)
>> -               eventfd_signal(p->eventfd, 1);
>> +               eventfd_signal(p->eventfd);
>>          mutex_unlock(&client->vm->ioeventfds_lock);
>>
>>          return 0;
>> diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
>> index 1ce7f3c7a950..7efc0c62e984 100644
>> --- a/drivers/xen/privcmd.c
>> +++ b/drivers/xen/privcmd.c
>> @@ -1147,7 +1147,7 @@ static irqreturn_t ioeventfd_interrupt(int irq, void *dev_id)
>>                  if (ioreq->addr == kioeventfd->addr + VIRTIO_MMIO_QUEUE_NOTIFY &&
>>                      ioreq->size == kioeventfd->addr_len &&
>>                      (ioreq->data & QUEUE_NOTIFY_VQ_MASK) == kioeventfd->vq) {
>> -                       eventfd_signal(kioeventfd->eventfd, 1);
>> +                       eventfd_signal(kioeventfd->eventfd);
>>                          state = STATE_IORESP_READY;
>>                          break;
>>                  }
>> diff --git a/fs/aio.c b/fs/aio.c
>> index f8589caef9c1..5c5b09e52d75 100644
>> --- a/fs/aio.c
>> +++ b/fs/aio.c
>> @@ -1166,7 +1166,7 @@ static void aio_complete(struct aio_kiocb *iocb)
>>           * from IRQ context.
>>           */
>>          if (iocb->ki_eventfd)
>> -               eventfd_signal(iocb->ki_eventfd, 1);
>> +               eventfd_signal(iocb->ki_eventfd);
>>
>>          /*
>>           * We have to order our ring_info tail store above and test
>> diff --git a/fs/eventfd.c b/fs/eventfd.c
>> index 33a918f9566c..dc9e01053235 100644
>> --- a/fs/eventfd.c
>> +++ b/fs/eventfd.c
>> @@ -74,20 +74,17 @@ __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask)
>>   /**
>>    * eventfd_signal - Adds @n to the eventfd counter.
>>    * @ctx: [in] Pointer to the eventfd context.
>> - * @n: [in] Value of the counter to be added to the eventfd internal counter.
>> - *          The value cannot be negative.
>>    *
>>    * This function is supposed to be called by the kernel in paths that do not
>>    * allow sleeping. In this function we allow the counter to reach the ULLONG_MAX
>>    * value, and we signal this as overflow condition by returning a EPOLLERR
>>    * to poll(2).
>>    *
>> - * Returns the amount by which the counter was incremented.  This will be less
>> - * than @n if the counter has overflowed.
>> + * Returns the amount by which the counter was incremented.
>>    */
>> -__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
>> +__u64 eventfd_signal(struct eventfd_ctx *ctx)
>>   {
>> -       return eventfd_signal_mask(ctx, n, 0);
>> +       return eventfd_signal_mask(ctx, 1, 0);
>>   }
>>   EXPORT_SYMBOL_GPL(eventfd_signal);
>>
>> diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
>> index b9d83652c097..562089431551 100644
>> --- a/include/linux/eventfd.h
>> +++ b/include/linux/eventfd.h
>> @@ -35,7 +35,7 @@ void eventfd_ctx_put(struct eventfd_ctx *ctx);
>>   struct file *eventfd_fget(int fd);
>>   struct eventfd_ctx *eventfd_ctx_fdget(int fd);
>>   struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
>> -__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
>> +__u64 eventfd_signal(struct eventfd_ctx *ctx);
>>   __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask);
>>   int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
>>                                    __u64 *cnt);
>> @@ -58,7 +58,7 @@ static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
>>          return ERR_PTR(-ENOSYS);
>>   }
>>
>> -static inline int eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
>> +static inline int eventfd_signal(struct eventfd_ctx *ctx)
>>   {
>>          return -ENOSYS;
>>   }
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 774bd6e21e27..dfbb1d3b77b7 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -4378,7 +4378,7 @@ static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap)
>>           * only one element of the array here.
>>           */
>>          for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--)
>> -               eventfd_signal(t->entries[i].eventfd, 1);
>> +               eventfd_signal(t->entries[i].eventfd);
>>
>>          /* i = current_threshold + 1 */
>>          i++;
>> @@ -4390,7 +4390,7 @@ static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap)
>>           * only one element of the array here.
>>           */
>>          for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++)
>> -               eventfd_signal(t->entries[i].eventfd, 1);
>> +               eventfd_signal(t->entries[i].eventfd);
>>
>>          /* Update current_threshold */
>>          t->current_threshold = i - 1;
>> @@ -4430,7 +4430,7 @@ static int mem_cgroup_oom_notify_cb(struct mem_cgroup *memcg)
>>          spin_lock(&memcg_oom_lock);
>>
>>          list_for_each_entry(ev, &memcg->oom_notify, list)
>> -               eventfd_signal(ev->eventfd, 1);
>> +               eventfd_signal(ev->eventfd);
>>
>>          spin_unlock(&memcg_oom_lock);
>>          return 0;
>> @@ -4649,7 +4649,7 @@ static int mem_cgroup_oom_register_event(struct mem_cgroup *memcg,
>>
>>          /* already in OOM ? */
>>          if (memcg->under_oom)
>> -               eventfd_signal(eventfd, 1);
>> +               eventfd_signal(eventfd);
>>          spin_unlock(&memcg_oom_lock);
>>
>>          return 0;
>> @@ -4941,7 +4941,7 @@ static void memcg_event_remove(struct work_struct *work)
>>          event->unregister_event(memcg, event->eventfd);
>>
>>          /* Notify userspace the event is going away. */
>> -       eventfd_signal(event->eventfd, 1);
>> +       eventfd_signal(event->eventfd);
>>
>>          eventfd_ctx_put(event->eventfd);
>>          kfree(event);
>> diff --git a/mm/vmpressure.c b/mm/vmpressure.c
>> index 22c6689d9302..bd5183dfd879 100644
>> --- a/mm/vmpressure.c
>> +++ b/mm/vmpressure.c
>> @@ -169,7 +169,7 @@ static bool vmpressure_event(struct vmpressure *vmpr,
>>                          continue;
>>                  if (level < ev->level)
>>                          continue;
>> -               eventfd_signal(ev->efd, 1);
>> +               eventfd_signal(ev->efd);
>>                  ret = true;
>>          }
>>          mutex_unlock(&vmpr->events_lock);
>> diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
>> index 69ba0281f9e0..2284b3751240 100644
>> --- a/samples/vfio-mdev/mtty.c
>> +++ b/samples/vfio-mdev/mtty.c
>> @@ -234,10 +234,10 @@ static void mtty_trigger_interrupt(struct mdev_state *mdev_state)
>>
>>          if (is_msi(mdev_state)) {
>>                  if (mdev_state->msi_evtfd)
>> -                       eventfd_signal(mdev_state->msi_evtfd, 1);
>> +                       eventfd_signal(mdev_state->msi_evtfd);
>>          } else if (is_intx(mdev_state)) {
>>                  if (mdev_state->intx_evtfd && !mdev_state->intx_mask) {
>> -                       eventfd_signal(mdev_state->intx_evtfd, 1);
>> +                       eventfd_signal(mdev_state->intx_evtfd);
>>                          mdev_state->intx_mask = true;
>>                  }
>>          }
>> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
>> index 89912a17f5d5..c0e230f4c3e9 100644
>> --- a/virt/kvm/eventfd.c
>> +++ b/virt/kvm/eventfd.c
>> @@ -61,7 +61,7 @@ static void irqfd_resampler_notify(struct kvm_kernel_irqfd_resampler *resampler)
>>
>>          list_for_each_entry_srcu(irqfd, &resampler->list, resampler_link,
>>                                   srcu_read_lock_held(&resampler->kvm->irq_srcu))
>> -               eventfd_signal(irqfd->resamplefd, 1);
>> +               eventfd_signal(irqfd->resamplefd);
>>   }
>>
>>   /*
>> @@ -786,7 +786,7 @@ ioeventfd_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this, gpa_t addr,
>>          if (!ioeventfd_in_range(p, addr, len, val))
>>                  return -EOPNOTSUPP;
>>
>> -       eventfd_signal(p->eventfd, 1);
>> +       eventfd_signal(p->eventfd);
>>          return 0;
>>   }
>>
>>
>> --
>> 2.42.0
>>
>>