+ Uros Bizjak ubizjak@gmail.com
On Thu, 3 Apr 2025 at 15:50, Naresh Kamboju naresh.kamboju@linaro.org wrote:
Regressions on x86_64 builds tinyconfig, allnoconfig failed with toolchains clang-20 and gcc-13 on the Linux next starting from next-20250403.
First seen on the next-20250403 Good: next-20250402 Bad: next-20250403
Regressions found on x86_64:
- build/gcc-13-tinyconfig
- build/gcc-13-allnoconfig
- build/clang-20-tinyconfig
- build/clang-20-allnoconfig
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
Boot regression: x86_64 mwait.h:30:15: error: invalid operand for instruction
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Build log In file included from arch/x86/kernel/process.c:36: arch/x86/include/asm/mwait.h:30:15: error: invalid operand for instruction 30 | asm volatile("monitor %0, %1, %2" :: "a" (eax), "c" (ecx), "d" (edx)); | ^ <inline asm>:1:16: note: instantiated into assembly here 1 | monitor %rax, %ecx, %edx | ^~~~~ In file included from arch/x86/kernel/process.c:36: arch/x86/include/asm/mwait.h:95:15: error: instruction requires: Not 64-bit mode 95 | asm volatile("sti; mwait %0, %1" :: "a" (eax), "c" (ecx)); | ^ <inline asm>:1:7: note: instantiated into assembly here 1 | sti; mwait %eax, %ecx | ^ 2 errors generated.
Anders bisected this to,
# first bad commit: [cd3b85b27542968198e3d588a2bc0591930ee2ee] x86/idle: Use MONITOR and MWAIT mnemonics in <asm/mwait.h>
## Source
- Kernel version: 6.14.0
- Git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
- Git sha: f0a16f5363325cc8d9382471cdc7b654c53254c9
- Git describe: next-20250403
- Project details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250403/
- Architectures: x86_64
- Toolchains: clang-20, gcc-13
- Kconfigs: tinyconfig, allnoconfig, lkftconfig
## Build
- Build log: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250403/tes...
- Build history:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250403/tes...
- Build details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250403/tes...
- Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2vCvvmy6fhzm3aMcptKXH...
- Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2vCvvmy6fhzm3aMcptKXH...
-- Linaro LKFT https://lkft.linaro.org
Links, - https://lore.kernel.org/all/CA+G9fYtzOxx1YWz2X4UYqvxB2vg7ptz6axmz-5HFLD9ieSj...
- Naresh