linux-kernel - Re: [PATCH] x86/Makefile: make -stack-alignment conditional on LLD

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Date:   Thu, 10 Jun 2021 12:04:18 +0200
From:   Greg KH <greg@...ah.com>
To:     torvic9@...lbox.org
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nathan@...nel.org" <nathan@...nel.org>,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] x86/Makefile: make -stack-alignment conditional on LLD <
 13.0.0

On Thu, Jun 10, 2021 at 11:28:04AM +0200, torvic9@...lbox.org wrote:
> Since LLVM commit 3787ee4, the '-stack-alignment' flag has been dropped [1],
> leading to the following error message when building a LTO kernel with
> Clang-13 and LLD-13:
> 
>     ld.lld: error: -plugin-opt=-: ld.lld: Unknown command line argument 
>     '-stack-alignment=8'.  Try 'ld.lld --help'
>     ld.lld: Did you mean '--stackrealign=8'?
> 
> It also appears that the '-code-model' flag is not necessary anymore starting
> with LLVM-9 [2].
> 
> Drop '-code-model' and make '-stack-alignment' conditional on LLD < 13.0.0.
> 
> This is for linux-stable 5.12.
> Another patch will be submitted for 5.13 shortly (unless there are objections).


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>