linux-kernel - Re: [PATCH] [PATCH v2] riscv: add as-options for modules with assembly compontents

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Message-ID: <8b110ad1-b5de-40ba-4131-faee1f9bde26@codethink.co.uk>
Date:   Tue, 10 Aug 2021 09:49:14 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     linux-kernel@...ts.codethink.co.uk, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, Bin Meng <bmeng.cn@...il.com>
Subject: Re: [PATCH] [PATCH v2] riscv: add as-options for modules with
 assembly compontents

On 20/07/2021 15:44, Ben Dooks wrote:
> When trying to load modules built for RISC-V which include assembly files
> the kernel loader errors with "unexpected relocation type 'R_RISCV_ALIGN'"
> due to R_RISCV_ALIGN relocations being generated by the assembler.
> 
> The R_RISCV_ALIGN relocations can be removed at the expense of code space
> by adding -mno-relax to gcc and as.  In commit 7a8e7da42250138
> ("RISC-V: Fixes to module loading") -mno-relax is added to the build
> variable KBUILD_CFLAGS_MODULE. See [1] for more info.
> 
> The issue is that when kbuild builds a .S file, it invokes gcc with
> the -mno-relax flag, but this is not being passed through to the
> assembler. Adding -Wa,-mno-relax to KBUILD_AFLAGS_MODULE ensures that
> the assembler is invoked correctly. This may have now been fixed in
> gcc[2] and this addition should not stop newer gcc and as from working.
> 
> [1] https://github.com/riscv/riscv-elf-psabi-doc/issues/183
> [2] https://github.com/gcc-mirror/gcc/commit/3b0a7d624e64eeb81e4d5e8c62c46d86ef521857

Just wanted to check v2 is fine for merging, and if so when is that
likely to be?

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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