linux-kernel - Re: [PATCH] riscv: add correct as-options for assembly in modules

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Message-ID: <CAEUhbmWmrEuwdy8OPhF1p1Sb7779QiWkx-Ca1OG5VQ38dxChLw@mail.gmail.com>
Date:   Fri, 16 Jul 2021 18:44:14 +0800
From:   Bin Meng <bmeng.cn@...il.com>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     linux-kernel@...ts.codethink.co.uk,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH] riscv: add correct as-options for assembly in modules

On Tue, Jul 13, 2021 at 2:28 AM Ben Dooks <ben.dooks@...ethink.co.uk> wrote:
>
> When trying to load modules built for riscv which include assembly

nits: RISC-V

> the kernel loader errors with "unexpected relocation type 'R_RISCV_ALIGN'"
> due to R_RISCV_ALIGN relocations being generated by the assembler.
>
> In commit 7a8e7da42250138 ("RISC-V: Fixes to module loading")
> the fix for gcc adds -mno-relax to the command line when building
> C files. However this was never applied to assembly flags, and gcc
> does no pass -mno-relax to gas when presented with a .S file.

does not pass

FYI

The GCC bug was fixed recently via:
https://github.com/gcc-mirror/gcc/commit/3b0a7d624e64eeb81e4d5e8c62c46d86ef521857

>
> The fix (other than making gcc always pass -mno-relax to gas) is
> to add -Wa,-mno-relax to gcc to make sure the as is invoked with
> the right options.
>
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> ---
>  arch/riscv/Makefile | 1 +
>  1 file changed, 1 insertion(+)
>

Otherwise,
Reviewed-by: Bin Meng <bmeng.cn@...il.com>