eventfd: simplify eventfd_signal()

Ever since the eventfd 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.

Link: https://lore.kernel.org/r/20231122-vfs-eventfd-signal-v2-2-bd549b14ce0c@kernel.org
Acked-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com> # ocxl
Acked-by: Eric Farman <farman@linux.ibm.com>  # s390
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>

30 files changed, 61 insertions, 64 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 b32ba5f2b240..c8e7dfc9f791 100644
--- a/drivers/gpu/drm/i915/gvt/interrupt.c
+++ b/drivers/gpu/drm/i915/gvt/interrupt.c
@@ -453,7 +453,7 @@ static void inject_virtual_interrupt(struct intel_vgpu *vgpu)
 	if (!test_bit(INTEL_VGPU_STATUS_ATTACHED, vgpu->status))
 		return;
 	if (vgpu->msi_trigger)
-		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 d02842156b35..7c691cf84cc7 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..d2f7d2d8a351 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -72,22 +72,19 @@ __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask)
 }
 
 /**
- * eventfd_signal - Adds @n to the eventfd counter.
+ * eventfd_signal - Increment the event 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;
 }