On Mon, Dec 04, 2023 at 11:13:04AM -0700, Nathan Chancellor wrote:
Hi Naresh,
On Mon, Dec 04, 2023 at 05:33:26PM +0530, Naresh Kamboju wrote:
Following build errors noticed on Linux next-20231204 tag with clang-nightly for arm and arm64.
## Test Regressions (compared to next-20231201)
arm64, build
- clang-nightly-defconfig
- clang-nightly-defconfig-40bc7ee5
- clang-nightly-lkftconfig
- clang-nightly-lkftconfig-kselftest
arm, build
- clang-nightly-allnoconfig
- clang-nightly-axm55xx_defconfig
- clang-nightly-bcm2835_defconfig
- clang-nightly-clps711x_defconfig
- clang-nightly-defconfig
- clang-nightly-exynos_defconfig
- clang-nightly-imx_v6_v7_defconfig
- clang-nightly-keystone_defconfig
- clang-nightly-lkftconfig
- clang-nightly-lkftconfig-kselftest
- clang-nightly-omap2plus_defconfig
- clang-nightly-pxa910_defconfig
- clang-nightly-s3c6400_defconfig
- clang-nightly-s5pv210_defconfig
- clang-nightly-sama5_defconfig
- clang-nightly-shmobile_defconfig
- clang-nightly-tinyconfig
- clang-nightly-u8500_defconfig
- clang-nightly-vexpress_defconfig
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Build log on arm64:
In file included from lib/vdso/gettimeofday.c:5: In file included from include/vdso/datapage.h:135: arch/arm64/include/asm/vdso/compat_gettimeofday.h:152:15: error: instruction variant requires ARMv6 or later 152 | asm volatile("mov %0, %1" : "=r"(ret) : "r"(_vdso_data)); | ^ <inline asm>:1:2: note: instantiated into assembly here 1 | mov r4, r1 | ^
I have to wonder why Clang is complaining about "mov r4, r1" because that certainly should not require "ARMv6 or later". On the face of it, this to me looks like a bug in Clang.