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Date: Fri, 17 May 2024 07:56:55 -0700
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,
	clang-built-linux <llvm@lists.linux.dev>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Anders Roxell <anders.roxell@linaro.org>,
	Dan Carpenter <dan.carpenter@linaro.org>,
	Borislav Petkov <bp@suse.de>, Borislav Petkov <bp@alien8.de>,
	Ingo Molnar <mingo@kernel.org>
Subject: Re: clang: arch/x86/boot/printf.c:257:3: error: unannotated
 fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
Message-ID: <20240517145655.GA3660288@thelio-3990X>
References: <CA+G9fYuyPFBVyqqg0RVhaz4c0S+H4TMm1apxgwyTUOkge9NY7A@mail.gmail.com>
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In-Reply-To: <CA+G9fYuyPFBVyqqg0RVhaz4c0S+H4TMm1apxgwyTUOkge9NY7A@mail.gmail.com>

Hi Naresh,

On Fri, May 17, 2024 at 01:00:25PM +0200, Naresh Kamboju wrote:
> The following x86 build failed on Linux next-20240517 tag due to following
> warnings / errors only seen with clang builds.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> Build errors:
> ----
> arch/x86/boot/printf.c:257:3: error: unannotated fall-through between
> switch labels [-Werror,-Wimplicit-fallthrough]
>   257 |                 case 'u':
>       |                 ^
> arch/x86/boot/printf.c:257:3: note: insert 'break;' to avoid fall-through
>   257 |                 case 'u':
>       |                 ^
>       |                 break;
> 1 error generated.
> 
> The suspected patch,
> x86/boot: Add a fallthrough annotation

Thanks for the report, this has been addressed:

https://git.kernel.org/tip/82110ae235e0560d1f952f74f9fd991587b0e3a7

Cheers,
Nathan