* Re: [PATCH 1/2] eventfd: simplify eventfd_signal()
2023-07-13 10:05 ` [PATCH 1/2] eventfd: simplify eventfd_signal() Christian Brauner
@ 2023-07-13 13:29 ` Anthony Krowiak
2023-07-13 13:34 ` Oded Gabbay
1 sibling, 0 replies; 8+ messages in thread
From: Anthony Krowiak @ 2023-07-13 13:29 UTC (permalink / raw)
To: Christian Brauner, linux-fsdevel
Cc: Vitaly Kuznetsov, Sean Christopherson, Paolo Bonzini,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86,
David Woodhouse, Paul Durrant, Oded Gabbay, Wu Hao, Tom Rix,
Moritz Fischer, Xu Yilun, Zhenyu Wang, Zhi Wang, Jani Nikula,
Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
David Airlie <>
For vfio_ap_ops.c:
Reviewed-by: Tony Krowiak <akrowiak@stny.rr.com>
On 7/13/23 6:05 AM, Christian Brauner 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/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(¬ifier_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;
> }
>
>
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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH 1/2] eventfd: simplify eventfd_signal()
2023-07-13 10:05 ` [PATCH 1/2] eventfd: simplify eventfd_signal() Christian Brauner
2023-07-13 13:29 ` Anthony Krowiak
@ 2023-07-13 13:34 ` Oded Gabbay
1 sibling, 0 replies; 8+ messages in thread
From: Oded Gabbay @ 2023-07-13 13:34 UTC (permalink / raw)
To: Christian Brauner
Cc: linux-fsdevel, Vitaly Kuznetsov, Sean Christopherson,
Paolo Bonzini, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
Dave Hansen, x86, David Woodhouse, Paul Durrant, Wu Hao, Tom Rix,
Moritz Fischer, Xu Yilun, Zhenyu Wang, Zhi Wang, Jani Nikula,
Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin, David
On Thu, Jul 13, 2023 at 1:06 PM 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/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(¬ifier_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;
> }
>
>
> --
> 2.34.1
>
For habanalabs (device.c):
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
^ permalink raw reply [flat|nested] 8+ messages in thread