linux-kernel - Re: [PATCH] arm64: alternatives: Move length validation in alternative

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Message-ID: <20210415091743.GB1015@arm.com>
Date:   Thu, 15 Apr 2021 10:17:43 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Will Deacon <will@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Jian Cai <jiancai@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com, stable@...r.kernel.org
Subject: Re: [PATCH] arm64: alternatives: Move length validation in
 alternative_{insn,endif}

Hi Nathan,

On Tue, Apr 13, 2021 at 05:08:04PM -0700, Nathan Chancellor wrote:
> After commit 2decad92f473 ("arm64: mte: Ensure TIF_MTE_ASYNC_FAULT is
> set atomically"), LLVM's integrated assembler fails to build entry.S:
> 
> <instantiation>:5:7: error: expected assembly-time absolute expression
>  .org . - (664b-663b) + (662b-661b)
>       ^
> <instantiation>:6:7: error: expected assembly-time absolute expression
>  .org . - (662b-661b) + (664b-663b)
>       ^

I tried the latest Linus' tree and linux-next (defconfig) with this
commit in and I can't get your build error. I used both clang-10 from
Debian stable and clang-11 from Debian sid. So, which clang version did
you use or which kernel config options?

-- 
Catalin