linux-kernel - Re: [PATCH] riscv: kbuild: drop CONFIG_RISCV_ISA_C

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Date:   Thu, 8 Aug 2019 14:18:53 +0200
From:   Charles Papon <charles.papon.90@...il.com>
To:     Bin Meng <bmeng.cn@...il.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Atish Patra <atish.patra@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: kbuild: drop CONFIG_RISCV_ISA_C

Please do not drop it.

Compressed instruction extension has some specific overhead in small
RISC-V FPGA softcore, especialy in the ones which can't implement the
register file read in a asynchronous manner because of the FPGA
technology.
What are reasons to enforce RVC ?

On Wed, Aug 7, 2019 at 2:29 PM Bin Meng <bmeng.cn@...il.com> wrote:
>
> On Wed, Aug 7, 2019 at 10:30 AM Paul Walmsley <paul.walmsley@...ive.com> wrote:
> >
> >
> > The baseline ISA support requirement for the RISC-V Linux kernel
> > mandates compressed instructions, so it doesn't make sense for
> > compressed instruction support to be configurable.
> >
> > Signed-off-by: Paul Walmsley <paul.walmsley@...ive.com>
> > Cc: Atish Patra <atish.patra@....com>
> >
> > ---
> >  arch/riscv/Kconfig  | 10 ----------
> >  arch/riscv/Makefile |  2 +-
> >  2 files changed, 1 insertion(+), 11 deletions(-)
> >
>
> Reviewed-by: Bin Meng <bmeng.cn@...il.com>
>
> _______________________________________________
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> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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