linux-kernel - Re: [PATCH 3/4] crypto: arm64: generate *.S by Perl at build time instead of shipping them

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Message-ID: <CAMj1kXFe7wf_3jmoSAM98s+sZS4Ex4yyoXXiToR-EX8K0e-aNw@mail.gmail.com>
Date:   Mon, 26 Apr 2021 11:01:43 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Will Deacon <will@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] crypto: arm64: generate *.S by Perl at build time
 instead of shipping them

On Mon, 26 Apr 2021 at 10:58, Will Deacon <will@...nel.org> wrote:
>
> [+Ard]
>
> On Mon, Apr 26, 2021 at 02:57:33AM +0900, Masahiro Yamada wrote:
> > Generate *.S by Perl like arch/{mips,x86}/crypto/Makefile.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  arch/arm64/crypto/Makefile                |    9 +-
> >  arch/arm64/crypto/poly1305-core.S_shipped |  835 ---------
> >  arch/arm64/crypto/sha256-core.S_shipped   | 2069 ---------------------
> >  arch/arm64/crypto/sha512-core.S_shipped   | 1093 -----------
> >  4 files changed, 3 insertions(+), 4003 deletions(-)
> >  delete mode 100644 arch/arm64/crypto/poly1305-core.S_shipped
> >  delete mode 100644 arch/arm64/crypto/sha256-core.S_shipped
> >  delete mode 100644 arch/arm64/crypto/sha512-core.S_shipped
>
> What's the advantage of removing the _shipped files? We included them
> originally so that we didn't require perl for the kernel build -- is that no
> longer an issue?
>
> I guess I'm just missing the justification for the change.

Removing 4000 lines of code is an improvement in itself, I suppose,
but I have no preference either way,