linux-kernel - Re: [PATCH] gpu/drm/amd/amdkfd: fix build, select MMU

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Date:   Thu, 19 Apr 2018 12:46:14 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, sfr@...b.auug.org.au,
        linux-next@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Oded Gabbay <oded.gabbay@...il.com>
Subject: Re: [PATCH] gpu/drm/amd/amdkfd: fix build, select MMU_NOTIFIER

On 14 April 2018 at 04:49, Randy Dunlap <rdunlap@...radead.org> wrote:
> From: Randy Dunlap <rdunlap@...radead.org>
>
> When CONFIG_MMU_NOTIFIER is not enabled, struct mmu_notifier has an
> incomplete type definition, which causes build errors.
>
> ../drivers/gpu/drm/amd/amdkfd/kfd_priv.h:607:22: error: field 'mmu_notifier' has incomplete type
> ../include/linux/kernel.h:979:32: error: dereferencing pointer to incomplete type
> ../include/linux/kernel.h:980:18: error: dereferencing pointer to incomplete type
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:434:2: error: implicit declaration of function 'mmu_notifier_unregister_no_release' [-Werror=implicit-function-declaration]
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:435:2: error: implicit declaration of function 'mmu_notifier_call_srcu' [-Werror=implicit-function-declaration]
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:438:21: error: variable 'kfd_process_mmu_notifier_ops' has initializer but incomplete type
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:439:2: error: unknown field 'release' specified in initializer
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:439:2: warning: excess elements in struct initializer [enabled by default]
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:439:2: warning: (near initialization for 'kfd_process_mmu_notifier_ops') [enabled by default]
> ../drivers/gpu/drm/amd/amdkfd/kfd_process.c:534:2: error: implicit declaration of function 'mmu_notifier_register' [-Werror=implicit-function-declaration]
>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Oded Gabbay <oded.gabbay@...il.com>
> Cc: dri-devel@...ts.freedesktop.org

Tested-by: Anders Roxell <anders.roxell@...aro.org>

> ---
> From linux-next, not mmotm, but found in mmotm builds.
>
>  drivers/gpu/drm/amd/amdkfd/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
>
> --- mmotm-2018-0413-1728.orig/drivers/gpu/drm/amd/amdkfd/Kconfig
> +++ mmotm-2018-0413-1728/drivers/gpu/drm/amd/amdkfd/Kconfig
> @@ -6,5 +6,6 @@ config HSA_AMD
>         tristate "HSA kernel driver for AMD GPU devices"
>         depends on DRM_AMDGPU && X86_64
>         imply AMD_IOMMU_V2
> +       select MMU_NOTIFIER
>         help
>           Enable this if you want to use HSA features on AMD GPU devices.
>