# git rev-parse -q --verify 50d2a40f2caac5bb31627ee20039e74332bd0d8a^{commit} 50d2a40f2caac5bb31627ee20039e74332bd0d8a already have revision, skipping fetch # git checkout -q -f -B kisskb 50d2a40f2caac5bb31627ee20039e74332bd0d8a # git clean -qxdf # < git log -1 # commit 50d2a40f2caac5bb31627ee20039e74332bd0d8a # Author: Michael Ellerman # Date: Mon Jul 25 14:37:29 2022 +1000 # # drm/amdgpu: Re-enable DCN for 64-bit powerpc # # Commit d11219ad53dc ("amdgpu: disable powerpc support for the newer # display engine") disabled the DCN driver for all of powerpc due to # unresolved build failures with some compilers. # # Further digging shows that the build failures only occur with compilers # that default to 64-bit long double. # # Both the ppc64 and ppc64le ABIs define long double to be 128-bits, but # there are compilers in the wild that default to 64-bits. The compilers # provided by the major distros (Fedora, Ubuntu) default to 128-bits and # are not affected by the build failure. # # There is a compiler flag to force 128-bit long double, which may be the # correct long term fix, but as an interim fix only allow building the DCN # driver if long double is 128-bits by default. # # The bisection in commit d11219ad53dc must have gone off the rails at # some point, the build failure occurs all the way back to the original # commit that enabled DCN support on powerpc, at least with some # toolchains. # # Depends-on: d11219ad53dc ("amdgpu: disable powerpc support for the newer display engine") # Fixes: 16a9dea110a6 ("amdgpu: Enable initial DCN support on POWER") # Signed-off-by: Michael Ellerman # Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2100 # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 50d2a40f2caac5bb31627ee20039e74332bd0d8a # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- mpc85xx_defconfig # Added to kconfig CONFIG_PPC_E500MC=y # Added to kconfig CONFIG_VIRTUALIZATION=y # Added to kconfig CONFIG_KVM_E500MC=y # Added to kconfig # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig .config:4375:warning: override: reassigning to symbol PPC_E500MC .config:4376:warning: override: reassigning to symbol VIRTUALIZATION # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- In file included from /kisskb/src/include/linux/build_bug.h:5, from /kisskb/src/include/linux/container_of.h:5, from /kisskb/src/include/linux/list.h:5, from /kisskb/src/include/linux/module.h:12, from /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:15: /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: In function 'allocate_bd': /kisskb/src/include/linux/err.h:22:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 22 | #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) | ^ /kisskb/src/include/linux/compiler.h:78:45: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:139:13: note: in expansion of macro 'IS_ERR_VALUE' 139 | if (IS_ERR_VALUE(fep->ring_mem_addr)) | ^~~~~~~~~~~~ /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8541cds.dts:341.15-350.5: Warning (pci_device_reg): /pci@e0008000/i8259@19000: PCI unit address format error, expected "12,0" /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8541cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8555cds.dts:341.15-350.5: Warning (pci_device_reg): /pci@e0008000/i8259@19000: PCI unit address format error, expected "12,0" /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8555cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) Completed OK # rm -rf /kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 # Build took: 0:01:46.702427