# Modpost: "nvidia\_p2p\_get\_pages" .. undefined **URL:** \ **Category:** CUDA Programming and Performance\ **Created:** [May 18, 2022, 1:41pm UTC](https://forums.developer.nvidia.com/t/modpost-nvidia-p2p-get-pages-undefined/214833 "2022-05-18T13:41:23Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![user98065](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@user98065](https://forums.developer.nvidia.com/u/user98065)\ **Post date:** [May 18, 2022, 1:41pm UTC](https://forums.developer.nvidia.com/t/modpost-nvidia-p2p-get-pages-undefined/214833/1 "2022-05-18T13:41:24Z")
Hi, My setup: Ubuntu 20.04 Kernel 5.13.0-40-generic #45~20.04.1-Ubuntu SMP Mon Apr 4 09:38:31 UTC 2022 x86\_64 x86\_64 x86\_64 GNU/Linux Nvidia drivers: nvidia-510.47.03 Cuda toolkit 11.6 I’m trying to build drivers for a KAYA frame grabber, and it fails with the following mesage: ```auto ERROR: modpost: "nvidia_p2p_get_pages" [/home/myuser/Desktop/KAYA/KAYA_Vision_Point_Setup_2022.1_Ubuntu_20.04_x64__branches-sw_6_1_x_2022_1_build_6.1.0.8456_2022-04-17_21-03-13/PCI_drv_Linux/predator_driver.ko] undefined! ``` I saw several posts on the web where developers had a similar problems, but no solutions offered. Can you please assist resolve the issue? ---
**Author:** ![Robert\_Crovella](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/robert_crovella/32/14043_2.png) [@Robert\_Crovella](https://forums.developer.nvidia.com/u/Robert_Crovella)\ **Post date:** [May 18, 2022, 2:03pm UTC](https://forums.developer.nvidia.com/t/modpost-nvidia-p2p-get-pages-undefined/214833/2 "2022-05-18T14:03:41Z")
> ---
**Author:** ![user98065](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@user98065](https://forums.developer.nvidia.com/u/user98065)\ **Post date:** [May 18, 2022, 3:00pm UTC](https://forums.developer.nvidia.com/t/modpost-nvidia-p2p-get-pages-undefined/214833/3 "2022-05-18T15:00:06Z")
Thanks @Robert_Crovella . The files you mentioned in the drivers ‘kernel’ directory (NVIDIA-Linux-x86\_64-510.47.03/kernel) are already available in /usr/src/nvidia-510.47.03/ on my machine (probably part of the driver / toolkit installation). When the frame grabber build script adds /usr/src/nvidia-510.47.03/ to the include path: ```auto /home/hpa_lara_gb/Desktop/KAYA/KAYA_Vision_Point_Setup_2022.1_Ubuntu_20.04_x64__branches-sw_6_1_x_2022_1_build_6.1.0.8456_2022-04-17_21-03-13/PCI_drv_Linux/aclpci_dma.c:76:9: note: #pragma message: Building with NV_BUILD_DGPU 76 | #pragma message("Building with NV_BUILD_DGPU") ``` Which means it includes \ succesfully (predator\_driver.o is genrated). ```auto #if (KAYA_CUDA_BUILD > 0) #if (KAYA_CUDA_BUILD == KAYA_CUDA_DGPU) #pragma message("Building with NV_BUILD_DGPU") #include #else #pragma message("Building without NV_BUILD_DGPU") #endif #endif // #if (KAYA_CUDA_BUILD > 0) ``` Does the driver have to dynamically link with some nvidia shared object? ---
**Author:** ![Robert\_Crovella](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/robert_crovella/32/14043_2.png) [@Robert\_Crovella](https://forums.developer.nvidia.com/u/Robert_Crovella)\ **Post date:** [May 18, 2022, 3:08pm UTC](https://forums.developer.nvidia.com/t/modpost-nvidia-p2p-get-pages-undefined/214833/4 "2022-05-18T15:08:07Z")
Have you checked with KAYA ? I personally have no experience building KAYA things. It looks to me like nvidia\_p2p\_get\_pages is [exported as a symbol](https://centos.pkgs.org/7/elrepo-x86_64/kmod-nvidia-510.47.03-1.el7_9.elrepo.x86_64.rpm.html) by our driver. ---
**Author:** ![user98065](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@user98065](https://forums.developer.nvidia.com/u/user98065)\ **Post date:** [May 18, 2022, 4:05pm UTC](https://forums.developer.nvidia.com/t/modpost-nvidia-p2p-get-pages-undefined/214833/5 "2022-05-18T16:05:35Z")
Thanks @Robert_Crovella , I contacted KAYA, but you guys responded faster. I followed your advice, as well as [GPUDirect RDMA :: CUDA Toolkit Documentation (nvidia.com)](https://docs.nvidia.com/cuda/gpudirect-rdma/index.html), compiled nvidia.ko, and added this line to the KAYA Makefile. ```auto KBUILD_EXTRA_SYMBOLS := $NVIDIA_SRC_DIR/Module.symvers ``` The message about nvidia\_p2p\_get\_pages still appears, but it’s a wraning, and the predator\_driver.ko is generated: ```auto WARNING: modpost: "nvidia_p2p_get_pages" [/home/hpa_lara_gb/Desktop/KAYA/KAYA_Vision_Point_Setup_2022.1_Ubuntu_20.04_x64__br456_2022-04-17_21-03-13/PCI_drv_Linux/predator_driver.ko] undefined! ```