linux-kernel - next-20250403: x86_64 mwait.h:30:15: error: invalid operand for instruction

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Message-ID: <CA+G9fYtzOxx1YWz2X4UYqvxB2vg7ptz6axmz-5HFLD9ieSjURw@mail.gmail.com>
Date: Thu, 3 Apr 2025 15:50:46 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Arnd Bergmann <arnd@...db.de>, Anders Roxell <anders.roxell@...aro.org>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: next-20250403: x86_64 mwait.h:30:15: error: invalid operand for instruction

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@...aro.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.


## 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/testrun/27871165/suite/build/test/clang-20-allnoconfig/log
* Build history:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250403/testrun/27871165/suite/build/test/clang-20-allnoconfig/history/
* Build details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250403/testrun/27871165/suite/build/test/clang-20-allnoconfig/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2vCvvmy6fhzm3aMcptKXHvRi4Bp/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2vCvvmy6fhzm3aMcptKXHvRi4Bp/config

--
Linaro LKFT
https://lkft.linaro.org