linux-kernel - Re: [OpenRISC] [PATCH 01/13] openrisc: use shadow registers to save regs on exception

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Date:   Fri, 1 Sep 2017 10:03:44 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Stafford Horne <shorne@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Jonas Bonn <jonas@...thpole.se>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Openrisc <openrisc@...ts.librecores.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [OpenRISC] [PATCH 01/13] openrisc: use shadow registers to save
 regs on exception

On Fri, Sep 1, 2017 at 10:02 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Wed, Aug 30, 2017 at 11:58 PM, Stafford Horne <shorne@...il.com> wrote:
>> --- a/arch/openrisc/Kconfig
>> +++ b/arch/openrisc/Kconfig
>> @@ -121,6 +121,16 @@ config OPENRISC_NO_SPR_SR_DSX
>>           Say N here if you know that your OpenRISC processor has
>>           SPR_SR_DSX bit implemented. Say Y if you are unsure.
>>
>> +config OPENRISC_HAVE_SHADOW_GPRS
>> +       bool "Support for shadow gpr files"
>
> default y if SMP?

Oops, that's not sufficient.

bool "Support for shadow gpr files" if !SMP
default y if SMP

>> +       help
>> +         Say Y here if your OpenRISC processor features shadowed
>> +         register files. They will in such case be used as a
>> +         scratch reg storage on exception entry.
>> +
>> +         On SMP systems, this feature is mandatory.
>> +         On a unicore system it's safe to say N here if you are unsure.
>> +

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