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Date: Mon, 18 Jul 2022 08:08:19 -0700
From: Nathan Chancellor <nathan@kernel.org>
To: "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@gmail.com>
Cc: llvm@lists.linux.dev
Subject: Re: x86_64 build failure of next-20220715 and next-20220718 with
 clang
Message-ID: <YtV3Y4Ha4tPk3kU4@dev-arch.thelio-3990X>
References: <YtVPpVFwy7WhXKPx@debian>
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In-Reply-To: <YtVPpVFwy7WhXKPx@debian>

Hi Sudip,

On Mon, Jul 18, 2022 at 01:18:45PM +0100, Sudip Mukherjee (Codethink) wrote:
> Hi All,
> 
> Not sure if its reported, builds of x86_64 allmodconfig of next-20220715
> and next-20220718 with clang are showing lots of new warnings like:
> 
> warning: objtool: asan.module_dtor+0x15: 'naked' return found in RETHUNK build

Thanks for the report! Nick fixed this in LLVM, it was a problem with
compiler generated functions like the ones that are generated with
KASAN, KCSAN, and GCOV having 'ret' instead of 'jmp __x86_return_thunk':

https://github.com/llvm/llvm-project/commit/140bfdca60ae8b1b2ad115846379e3c9ca914bfb

With that change, you should see no warnings of that nature with
allmodconfig anymore. Thanks for the continuous testing!

Cheers,
Nathan