Building the Linux kernel with Clang and LLVM
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From: Nathan Chancellor <nathan@kernel.org>
To: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: open list <linux-kernel@vger.kernel.org>,
	lkft-triage@lists.linaro.org,
	Linux Regressions <regressions@lists.linux.dev>,
	clang-built-linux <llvm@lists.linux.dev>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Dan Carpenter <dan.carpenter@linaro.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Ben Copeland <benjamin.copeland@linaro.org>,
	Anders Roxell <anders.roxell@linaro.org>
Subject: Re: next-20250819: sdhci-cadence.c error variable 'hrs37_mode' is uninitialized when used here [-Werror,-Wuninitialized]
Date: Wed, 20 Aug 2025 09:23:04 -0700	[thread overview]
Message-ID: <20250820162304.GD3805667@ax162> (raw)
In-Reply-To: <CA+G9fYtS9nDqC7g-B4285gmxDNRkYQixyPYMuzgDg5-sy2FumQ@mail.gmail.com>

Hi Naresh,

On Wed, Aug 20, 2025 at 06:43:51PM +0530, Naresh Kamboju wrote:
> 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@linaro.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

Thanks for the report. I sent a fix for this yesterday:

https://lore.kernel.org/20250819-mmc-sdhci-cadence-fix-uninit-hrs37_mode-v1-1-94aa2d0c438a@kernel.org/

Cheers,
Nathan

      reply	other threads:[~2025-08-20 16:23 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-20 13:13 next-20250819: sdhci-cadence.c error variable 'hrs37_mode' is uninitialized when used here [-Werror,-Wuninitialized] Naresh Kamboju
2025-08-20 16:23 ` Nathan Chancellor [this message]

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