linux-kernel - selftests: resctrl: cat_test.c: In function 'noncont_cat_run_test': ../kselftest.h:74:9: error: impossible constraint in 'asm' 74

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Date: Thu, 18 Apr 2024 15:07:57 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>
Cc: Fenghua Yu <fenghua.yu@...el.com>, Reinette Chatre <reinette.chatre@...el.com>, 
	Shuah Khan <shuah@...nel.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>
Subject: selftests: resctrl: cat_test.c: In function 'noncont_cat_run_test':
 ../kselftest.h:74:9: error: impossible constraint in 'asm' 74 | __asm__
 __volatile__ ("cpuid\n\t"

The Linux next building selftests with gcc-13 found these build warnings
and errors.

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Build log:
---------
Path:
selftests/resctrl/resctrl_tests/

In file included from resctrl.h:24,
                 from cat_test.c:11:
cat_test.c: In function 'noncont_cat_run_test':
./kselftest.h:74:9: error: impossible constraint in 'asm'
   74 |         __asm__ __volatile__ ("cpuid\n\t"
         \
      |         ^~~~~~~
cat_test.c:308:17: note: in expansion of macro '__cpuid_count'
  308 |                 __cpuid_count(0x10, 1, eax, ebx, ecx, edx);
      |                 ^~~~~~~~~~~~~
./kselftest.h:74:9: error: impossible constraint in 'asm'
   74 |         __asm__ __volatile__ ("cpuid\n\t"
         \
      |         ^~~~~~~
cat_test.c:310:17: note: in expansion of macro '__cpuid_count'
  310 |                 __cpuid_count(0x10, 2, eax, ebx, ecx, edx);
      |                 ^~~~~~~~~~~~~

Steps to reproduce:
---
tuxmake --runtime podman --target-arch arm64 --toolchain gcc-13 \
  --kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2fDW3wG8BqWxf0afUI5f4wkArPi/config
\
  debugkernel dtbs dtbs-legacy headers kernel kselftest modules

Links:
 - https://storage.tuxsuite.com/public/linaro/lkft/builds/2fDW3wG8BqWxf0afUI5f4wkArPi/

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