linux-kernel - Re: [PATCH] crypto: sm4 - Do not change section of ck and sbox

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Date:   Fri, 17 Sep 2021 11:18:52 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com, llvm@...ts.linux.dev
Subject: Re: [PATCH] crypto: sm4 - Do not change section of ck and sbox

On Wed, Aug 25, 2021 at 01:38:59PM -0700, Nathan Chancellor wrote:
> When building with clang and GNU as, there is a warning about ignored
> changed section attributes:
> 
> /tmp/sm4-c916c8.s: Assembler messages:
> /tmp/sm4-c916c8.s:677: Warning: ignoring changed section attributes for
> .data..cacheline_aligned
> 
> "static const" places the data in .rodata but __cacheline_aligned has
> the section attribute to place it in .data..cacheline_aligned, in
> addition to the aligned attribute.
> 
> To keep the alignment but avoid attempting to change sections, use the
> ____cacheline_aligned attribute, which is just the aligned attribute.
> 
> Fixes: 2b31277af577 ("crypto: sm4 - create SM4 library based on sm4 generic code")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1441
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> ---
>  lib/crypto/sm4.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt