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

[Nathan Chancellor]

On Tue, Apr 07, 2020 at 01:05:42PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the vhost tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> drivers/gpu/drm/virtio/virtgpu_kms.c: In function 'virtio_gpu_init':
> drivers/gpu/drm/virtio/virtgpu_kms.c:153:38: error: 'VIRTIO_RING_F_INDIRECT_DESC' undeclared (first use in this function)
>   153 |  if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
>       |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/virtio/virtgpu_kms.c:153:38: note: each undeclared identifier is reported only once for each function it appears in
> 
> Caused by commit
> 
>   898952f9597e ("virtio: stop using legacy struct vring in kernel")
> 
> interacting with commit
> 
>   5edbb5608256 ("drm/virtio: fix ring free check")
> 
> from Linus' tree (post v5.6).
> 
> I have added the following merge fix patch for today.
> 
> From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> Date: Tue, 7 Apr 2020 12:58:26 +1000
> Subject: [PATCH] drm/virtio: fix up for include file changes
> 
> Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/virtio/virtgpu_kms.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
> index 023a030ca7b9..f4ea4cef5e23 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_kms.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -25,6 +25,7 @@
>  
>  #include <linux/virtio.h>
>  #include <linux/virtio_config.h>
> +#include <linux/virtio_ring.h>
>  
>  #include <drm/drm_file.h>
>  
> -- 
> 2.25.0
> 
> I do have to wonder why all this code has been added to the vhost tree
> during the second week of the merge window (especially when I see it
> rebased 4 times in one day :-().  Is it really intended for v5.7?
> -- 
> Cheers,
> Stephen Rothwell

Linaro's CI also reports an issue with this patch with the remoteproc
drivers that were freshly merged in Linus' tree for 5.7-rc1 (seen with a
simple arm allyesconfig build):

drivers/rpmsg/mtk_rpmsg.c:68:2: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:93:9: error: implicit declaration of function 'kzalloc' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:170:2: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:204:9: error: implicit declaration of function 'kzalloc' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:223:3: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:259:9: error: implicit declaration of function 'kzalloc' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:376:3: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:387:15: error: implicit declaration of function 'kzalloc' [-Werror,-Wimplicit-function-declaration]
drivers/rpmsg/mtk_rpmsg.c:409:2: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
drivers/remoteproc/stm32_rproc.c:152:14: error: implicit declaration of function 'kcalloc' [-Werror,-Wimplicit-function-declaration]
drivers/remoteproc/stm32_rproc.c:179:2: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]

It seems like this series shouldn't be in -next until after 5.7-rc1 (or
rebased on Linus' tree if it is intended for the merge window).

Cheers,
Nathan