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

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Date:   Thu, 15 Apr 2021 06:25:57 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>
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}

On Thu, Apr 15, 2021 at 10:17:43AM +0100, Catalin Marinas wrote:
> 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
> 

Hi Catalin,

Interesting, this reproduces for me with LLVM 12 or newer with just
defconfig.

$ make -j"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 LLVM_IAS=1 defconfig arch/arm64/kernel/entry.o

https://github.com/ClangBuiltLinux/continuous-integration2/runs/2350258778?check_suite_focus=true

Cheers,
Nathan