Subject: Re: [PATCH net-next 2/5] virtio_net: Add page_pool support to improve performance

From: "Michael S. Tsirkin" <[email-masked]>
Date: Sun, 28 May 2023 02:27:17 -0400

On Sat, May 27, 2023 at 12:11:25AM +0800, kernel test robot wrote:
> Hi Liang,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on net-next/main]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Liang-Chen/virtio_net-Add-page_pool-support-to-improve-performance/20230526-135805
> base:   net-next/main
> patch link:    https://lore.kernel.org/r/20230526054621.18371-2-liangchen.linux%40gmail.com
> patch subject: [PATCH net-next 2/5] virtio_net: Add page_pool support to improve performance
> config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20230526/[email-masked]/config)
> compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/intel-lab-lkp/linux/commit/bfba563f43bba37181d8502cb2e566c32f96ec9e
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Liang-Chen/virtio_net-Add-page_pool-support-to-improve-performance/20230526-135805
>         git checkout bfba563f43bba37181d8502cb2e566c32f96ec9e
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 O=build_dir ARCH=x86_64 olddefconfig
>         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <[email-masked]>
> | Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/
> 
> All errors (new ones prefixed by >>):
> 
>    ld: vmlinux.o: in function `virtnet_find_vqs':
> >> virtio_net.c:(.text+0x901fb5): undefined reference to `page_pool_create'
>    ld: vmlinux.o: in function `add_recvbuf_mergeable.isra.0':
> >> virtio_net.c:(.text+0x905618): undefined reference to `page_pool_alloc_pages'
>    ld: vmlinux.o: in function `xdp_linearize_page':
>    virtio_net.c:(.text+0x906b6b): undefined reference to `page_pool_alloc_pages'
>    ld: vmlinux.o: in function `mergeable_xdp_get_buf.isra.0':
>    virtio_net.c:(.text+0x90728f): undefined reference to `page_pool_alloc_pages'

you need to tweak Kconfig to select PAGE_POOL I think.

> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki