next: clang: x86_64: /intel_display.c:6012:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]

[Nathan Chancellor]

Hi Naresh,

On Wed, May 24, 2023 at 12:32:24PM +0530, Naresh Kamboju wrote:
> Linux next-20230523 and next-20230524 the x86_64 and i386 builds failed
> with clang.
> 
> Reported-by: Linux Kernel Functional Testing <lkft at linaro.org>
> 
> make --silent --keep-going \
>   --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=x86_64 \
>   SRCARCH=x86 CROSS_COMPILE=x86_64-linux-gnu- \
>   'HOSTCC=sccache clang' 'CC=sccache clang' \
>    LLVM=1 LLVM_IAS=1
> 
> drivers/gpu/drm/i915/display/intel_display.c:6012:3: error:
> unannotated fall-through between switch labels
> [-Werror,-Wimplicit-fallthrough]
>                 case I915_FORMAT_MOD_X_TILED:
>                 ^
> drivers/gpu/drm/i915/display/intel_display.c:6012:3: note: insert
> 'break;' to avoid fall-through
>                 case I915_FORMAT_MOD_X_TILED:
>                 ^
>                 break;
> 1 error generated.

Thanks for the report, I have sent
https://lore.kernel.org/20230524-intel_async_flip_check_hw-implicit-fallthrough-v1-1-83de89e376a1@kernel.org/
for this.

Cheers,
Nathan