On 2018-02-16 04:26 PM, Arnd Bergmann wrote:
> In randconfig testing, we sometimes get this warning:
>
> drivers/gpu/drm/radeon/radeon_object.c: In function 'radeon_bo_create':
> drivers/gpu/drm/radeon/radeon_object.c:242:2: error: #warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance thanks to write-combining [-Werror=cpp]
> #warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance \
>
> This is rather annoying since almost all other code produces no build-time
> output unless we have found a real bug. We already fixed this in the
> amdgpu driver in commit 31bb90f1cd08 ("drm/amdgpu: shut up #warning for
> compile testing") by adding a CONFIG_COMPILE_TEST check last year and
> agreed to do the same here, but both Michel and I then forgot about it
> until I came across the issue again now.
>
> For stable kernels, as this is one of very few remaining randconfig
> warnings in 4.14.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Link: https://patchwork.kernel.org/patch/9550009/
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/gpu/drm/radeon/radeon_object.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
> index 093594976126..54c2b4fc5ead 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.c
> +++ b/drivers/gpu/drm/radeon/radeon_object.c
> @@ -238,9 +238,10 @@ int radeon_bo_create(struct radeon_device *rdev,
> * may be slow
> * See https://bugs.freedesktop.org/show_bug.cgi?id=88758
> */
> -
> +#ifndef CONFIG_COMPILE_TEST
> #warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance \
> thanks to write-combining
> +#endif
>
> if (bo->flags & RADEON_GEM_GTT_WC)
> DRM_INFO_ONCE("Please enable CONFIG_MTRR and CONFIG_X86_PAT for "
>
Merged on the internal amd-staging-drm-next branch, thanks!
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer