[PATCH 0/2] eventfd: simplify signal helpers

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/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 +-
  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 ++--
  28 files changed, 56 insertions(+), 59 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index b28fd020066f..2f4bd74b482c 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c

@@ -2387,7 +2387,7 @@ 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 40edf4d1974c..a7b62bafd57b 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c

@@ -2043,7 +2043,7 @@ 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 b97339d1f7c6..30357b371d61 100644
--- a/drivers/accel/habanalabs/common/device.c
+++ b/drivers/accel/habanalabs/common/device.c

@@ -1963,7 +1963,7 @@ 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/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
index 68eca023bbc6..3d9e09c2add4 100644
--- a/drivers/gpu/drm/i915/gvt/interrupt.c
+++ b/drivers/gpu/drm/i915/gvt/interrupt.c

@@ -435,7 +435,7 @@ static int inject_virtual_interrupt(struct intel_vgpu *vgpu)
  	 */
  	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
  		return -ESRCH;
-	if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger, 1) != 1)
+	if (vgpu->msi_trigger && eventfd_signal(vgpu->msi_trigger) != 1)
  		return -EFAULT;
  	return 0;
  }

diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
index db5fb196c728..ad50487790ff 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 6e63f060e4cc..51766db296ab 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c

@@ -185,7 +185,7 @@ 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 5b53b94f13c7..3df231f6feda 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 b441745b0418..feb88526ac9d 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c

@@ -1749,7 +1749,7 @@ 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 f41a385a5c42..ceb1aad0c5df 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);

@@ -2739,7 +2739,7 @@ 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 dc38ed21319d..99b901a9e638 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c

@@ -494,7 +494,7 @@ 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:

@@ -912,7 +912,7 @@ 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);

@@ -961,7 +961,7 @@ 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 20d7b69ea6ff..01c8e31db23b 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c

@@ -441,7 +441,7 @@ 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);

@@ -1861,7 +1861,7 @@ 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");

@@ -2280,7 +2280,7 @@ 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 b43e8680eee8..722894a0f124 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c

@@ -161,7 +161,7 @@ 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;
  }

@@ -172,7 +172,7 @@ 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 c71d573f1c94..bee50f153c8e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c

@@ -2250,7 +2250,7 @@ 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;
  		}
  	}

@@ -2273,7 +2273,7 @@ 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;
  }

@@ -2291,7 +2291,7 @@ 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;
  }

@@ -2717,7 +2717,7 @@ 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;
  }

@@ -2765,7 +2765,7 @@ 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/fs/aio.c b/fs/aio.c
index 77e33619de40..96cf97b19077 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 e8ca4bdcb03c..891550f575a1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c

@@ -4228,7 +4228,7 @@ 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++;

@@ -4240,7 +4240,7 @@ 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;

@@ -4280,7 +4280,7 @@ 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;

@@ -4499,7 +4499,7 @@ 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;

@@ -4791,7 +4791,7 @@ 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 b52644771cc4..ba4cdef37e42 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 a60801fb8660..5edcf8d738de 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c

@@ -1028,9 +1028,9 @@ static int mtty_trigger_interrupt(struct mdev_state *mdev_state)
  	}
  
  	if (mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX)
-		ret = eventfd_signal(mdev_state->msi_evtfd, 1);
+		ret = eventfd_signal(mdev_state->msi_evtfd);
  	else
-		ret = eventfd_signal(mdev_state->intx_evtfd, 1);
+		ret = eventfd_signal(mdev_state->intx_evtfd);
  
  #if defined(DEBUG_INTR)
  	pr_info("Intx triggered\n");

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;
  }