linux-kernel - Re: [PATCH 1/3] riscv: optimized memcpy

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Message-ID: <CAEUhbmX_wsfU9FfRJoOPE0gjUX=Bp7OZWOZDyMNfO6=M-fX_0A@mail.gmail.com>
Date:   Wed, 16 Jun 2021 08:33:21 +0800
From:   Bin Meng <bmeng.cn@...il.com>
To:     Emil Renner Berthing <kernel@...il.dk>
Cc:     David Laight <David.Laight@...lab.com>,
        Gary Guo <gary@...yguo.net>,
        Matteo Croce <mcroce@...ux.microsoft.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atish.patra@....com>,
        Akira Tsukamoto <akira.tsukamoto@...il.com>,
        Drew Fustini <drew@...gleboard.org>
Subject: Re: [PATCH 1/3] riscv: optimized memcpy

On Wed, Jun 16, 2021 at 12:12 AM Emil Renner Berthing <kernel@...il.dk> wrote:
>
> On Tue, 15 Jun 2021 at 15:29, Bin Meng <bmeng.cn@...il.com> wrote:
> > ...
> > Yes, Gary Guo sent one patch long time ago against the broken assembly
> > version, but that patch was still not applied as of today.
> > https://patchwork.kernel.org/project/linux-riscv/patch/20210216225555.4976-1-gary@garyguo.net/
> >
> > I suggest Matteo re-test using Gary's version.
>
> That's a good idea, but if you read the replies to Gary's original patch
> https://lore.kernel.org/linux-riscv/20210216225555.4976-1-gary@garyguo.net/
> .. both Gary, Palmer and David would rather like a C-based version.
> This is one attempt at providing that.

Yep, I prefer C as well :)

But if you check commit 04091d6, the assembly version was introduced
for KASAN. So if we are to change it back to C, please make sure KASAN
is not broken.

Regards,
Bin