Re: [PATCH v4 13/15] drm/amd/display: Use ARCH_HAS_KERNEL_FPU_SUPPORT

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Hello,

Samuel Holland <samuel.holland@xxxxxxxxxx> writes:

> Now that all previously-supported architectures select
> ARCH_HAS_KERNEL_FPU_SUPPORT, this code can depend on that symbol instead
> of the existing list of architectures. It can also take advantage of the
> common kernel-mode FPU API and method of adjusting CFLAGS.
>
> Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>

Unfortunately this patch causes build failures on arm with allyesconfig
and allmodconfig. Tested with next-20240410.

Error with allyesconfig:

$ make -j 8 \
    O=$HOME/.cache/builds/linux-cross-arm \
    ARCH=arm \
    CROSS_COMPILE=arm-linux-gnueabihf-
make[1]: Entering directory '/home/bauermann/.cache/builds/linux-cross-arm'
    ⋮
arm-linux-gnueabihf-ld: drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.o: in function `dcn20_populate_dml_pipes_from_context':
dcn20_fpu.c:(.text+0x20f4): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: dcn20_fpu.c:(.text+0x210c): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: dcn20_fpu.c:(.text+0x2124): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: dcn20_fpu.c:(.text+0x213c): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.o: in function `pipe_ctx_to_e2e_pipe_params':
dcn_calcs.c:(.text+0x390): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.o:dcn_calcs.c:(.text+0x3a4): more undefined references to `__aeabi_l2d' follow
arm-linux-gnueabihf-ld: drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.o: in function `optimize_configuration':
dml2_wrapper.c:(.text+0xcbc): undefined reference to `__aeabi_d2ulz'
arm-linux-gnueabihf-ld: drivers/gpu/drm/amd/display/dc/dml2/dml2_translation_helper.o: in function `populate_dml_plane_cfg_from_plane_state':
dml2_translation_helper.c:(.text+0x9e4): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: dml2_translation_helper.c:(.text+0xa20): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: dml2_translation_helper.c:(.text+0xa58): undefined reference to `__aeabi_l2d'
arm-linux-gnueabihf-ld: dml2_translation_helper.c:(.text+0xa90): undefined reference to `__aeabi_l2d'
make[3]: *** [/home/bauermann/src/linux/scripts/Makefile.vmlinux:37: vmlinux] Error 1
make[2]: *** [/home/bauermann/src/linux/Makefile:1165: vmlinux] Error 2
make[1]: *** [/home/bauermann/src/linux/Makefile:240: __sub-make] Error 2
make[1]: Leaving directory '/home/bauermann/.cache/builds/linux-cross-arm'
make: *** [Makefile:240: __sub-make] Error 2

The error with allmodconfig is slightly different:

$ make -j 8 \
    O=$HOME/.cache/builds/linux-cross-arm \
    ARCH=arm \
    CROSS_COMPILE=arm-linux-gnueabihf-
make[1]: Entering directory '/home/bauermann/.cache/builds/linux-cross-arm'
    ⋮
ERROR: modpost: "__aeabi_d2ulz" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "__aeabi_l2d" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
make[3]: *** [/home/bauermann/src/linux/scripts/Makefile.modpost:145: Module.symvers] Error 1
make[2]: *** [/home/bauermann/src/linux/Makefile:1876: modpost] Error 2
make[1]: *** [/home/bauermann/src/linux/Makefile:240: __sub-make] Error 2
make[1]: Leaving directory '/home/bauermann/.cache/builds/linux-cross-arm'
make: *** [Makefile:240: __sub-make] Error 2

--
Thiago




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