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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Dec 04, 2023 at 06:26:15PM +0000, Russell King (Oracle) wrote: > 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 > > > > > > > > > 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)); > > > | ^ > > > :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. This is because the compat vDSO is compiled with '-mthumb' by default and Nick helpfully pointed out on IRC that prior to ARMv6, one of the operands to the mov had to be a HI register, which I do see in the ARM: Encoding T1 ARMv6*, ARMv7 if and both from R0-R7 ARMv4T, ARMv5T*, ARMv6*, ARMv7 otherwise MOV , Cheers, Nathan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel