linux-kernel - next-20250819: sdhci-cadence.c error variable 'hrs37_mode' is uninitialized when used here [-Werror,-Wuninitialized]

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Message-ID: <CA+G9fYtS9nDqC7g-B4285gmxDNRkYQixyPYMuzgDg5-sy2FumQ@mail.gmail.com>
Date: Wed, 20 Aug 2025 18:43:51 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, clang-built-linux <llvm@...ts.linux.dev>
Cc: Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Arnd Bergmann <arnd@...db.de>, 
	Ben Copeland <benjamin.copeland@...aro.org>, Anders Roxell <anders.roxell@...aro.org>
Subject: next-20250819: sdhci-cadence.c error variable 'hrs37_mode' is
 uninitialized when used here [-Werror,-Wuninitialized]

The following build warnings / errors noticed with arm64 defconfig
and x86 allyesconfig with clang-20 and clang-nightly toolchains.

Regression Analysis:
- New regression? yes
- Reproducibility? yes

Build regression: next-20250819 sdhci-cadence.c error variable
'hrs37_mode' is uninitialized when used here [-Werror,-Wuninitialized]

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

## Build log
drivers/mmc/host/sdhci-cadence.c:297:9: error: variable 'hrs37_mode'
is uninitialized when used here [-Werror,-Wuninitialized]
  297 |         writel(hrs37_mode, hrs37_reg);
      |                ^~~~~~~~~~
drivers/mmc/host/sdhci-cadence.c:291:16: note: initialize the variable
'hrs37_mode' to silence this warning
  291 |         u32 hrs37_mode;
      |                       ^
      |                        = 0

## Source
* Kernel version: 6.17.0-rc2
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git describe: next-20250819
* Git commit: 3ac864c2d9bb8608ee236e89bf561811613abfce
* Architectures: arm64 x86
* Toolchains: clang-20
* Kconfigs: defconfig and allyesconfig

## Build
* Build log: https://qa-reports.linaro.org/api/testruns/29595553/log_file/
* Build details x86:
https://regressions.linaro.org/lkft/linux-next-master/next-20250819/log-parser-build-clang/clang-compiler-drivers_mmc_host_sdhci-cadence_c-error-variable-hrs_mode-is-uninitialized-when-used-here/
* Build details arm64:
https://regressions.linaro.org/lkft/linux-next-master/next-20250819/log-parser-build-clang/clang-compiler-drivers_mmc_host_sdhci-cadence_c-warning-variable-hrs_mode-is-uninitialized-when-used-here/
* Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/31UgO4773uaneRjyDrf418EXcDd
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/31UgO4773uaneRjyDrf418EXcDd/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/31UgO4773uaneRjyDrf418EXcDd/config

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