linux-kernel - Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d

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Message-ID: <20210115182300.GD9138@zn.tnic>
Date:   Fri, 15 Jan 2021 19:23:00 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>, linux-efi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index

On Thu, Jan 07, 2021 at 11:34:15PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When 5-level page tables are enabled, clang triggers a BUILD_BUG_ON():

I have CONFIG_X86_5LEVEL=y, CONFIG_EFI=y and am using Debian clang
version 10.0.1-8+b1 but my .config builds just fine.

How do you trigger this?

Thx.

-- 
Regards/Gruss,
    Boris.

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