Hi all,

After merging the vhost tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/vdpa/vdpa_user/vduse_dev.c: In function 'vduse_vdpa_kick_vq':
drivers/vdpa/vdpa_user/vduse_dev.c:489:6: error: implicit declaration of function 'eventfd_signal_count'; did you mean 'eventfd_signal_allowed'? [-Werror=implicit-function-declaration]
  489 |  if (eventfd_signal_count()) {
      |      ^~~~~~~~~~~~~~~~~~~~
      |      eventfd_signal_allowed

Caused by commit

  b66219796563 ("vduse: Introduce VDUSE - vDPA Device in Userspace")

interacting with commit

  b542e383d8c0 ("eventfd: Make signal recursion protection a task bit")

from Linus' tree.

I have applied the following merge fix patch for today.

From: Stephen Rothwell <redacted>
Date: Mon, 6 Sep 2021 12:43:32 +1000
Subject: [PATCH] fix up for "eventfd: Make signal recursion protection a task bit"

Signed-off-by: Stephen Rothwell <redacted>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 59a93e5b967a..5c25ff6483ad 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c

@@ -486,7 +486,7 @@ static void vduse_vdpa_kick_vq(struct vdpa_device *vdpa, u16 idx)
        struct vduse_dev *dev = vdpa_to_vduse(vdpa);
        struct vduse_virtqueue *vq = &dev->vqs[idx];

-       if (eventfd_signal_count()) {
+       if (eventfd_signal_allowed()) {
                schedule_work(&vq->kick);
                return;
        }
--