linux-kernel - Re: linux-next: build failure after merge of the vhost tree

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Date:   Mon, 6 Sep 2021 10:57:14 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the vhost tree

On Mon, Sep 6, 2021 at 10:50 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> 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 <sfr@...b.auug.org.au>
> 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 <sfr@...b.auug.org.au>
> ---
>  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;
>         }
> --

LGTM! Thank you for the fix!

Thanks,
Yongji