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: <CAK7LNAR+3DKGOdg=Jo1yt0QvjjjCzthKzpx5RCMK3x+MO0oMew@mail.gmail.com>
Date:   Mon, 26 Apr 2021 19:40:24 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Will Deacon <will@...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, Apr 26, 2021 at 6:01 PM Ard Biesheuvel <ardb@...nel.org> wrote:
>
> 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,



If necessary, I can send v2 with the following info added.


------------------------------>8---------------------------------
People building the arm64 kernel are likely to have Perl already
installed on the system.

ARCH=arm64 defconfig sets CONFIG_OID_REGISTRY=y, so Perl is required
to generate lib/oid_registery_data.c anyway.

Also, Documentation/process/changes.rst says:

You will need perl 5 and the following modules: ``Getopt::Long``,
``Getopt::Std``, ``File::Basename``, and ``File::Find`` to build the kernel.
------------------------------>8---------------------------------





--
Best Regards
Masahiro Yamada