linux-kernel - Re: [PATCH 2/4] riscv: __asm_copy_to-from

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Date:   Tue, 20 Jul 2021 11:49:18 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Akira Tsukamoto <akira.tsukamoto@...il.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] riscv: __asm_copy_to-from_user: Fix: fail on RV32

Hi Tsukamoto-san,

Thanks for your patch!

On Tue, Jul 20, 2021 at 10:51 AM Akira Tsukamoto
<akira.tsukamoto@...il.com> wrote:
> Had a bug when converting bytes to bits when the cpu was rv32.
>
> The a3 contains the number of bytes and multiple of 8
> would be the bits. The LGREG is holding 2 for RV32 and 3 for
> RV32, so to achieve multiple of 8 it must always be constant 3.

RV64

> The 2 was mistakenly used for rv32.
>
> Signed-off-by: Akira Tsukamoto <akira.tsukamoto@...il.com>

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds