linux-kernel - Re: [PATCH v2 00/11] test_user

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Message-ID: <CAMuHMdUzHwm5_TL7TNAOF+uqheJnKgsqF+_vzqGRzB_3eufKug@mail.gmail.com>
Date:	Tue, 11 Aug 2015 13:20:53 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	David Miller <davem@...emloft.net>
Cc:	James Hogan <james.hogan@...tec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Simek <monstr@...str.eu>,
	Ley Foon Tan <lftan@...era.com>,
	Jonas Bonn <jonas@...thpole.se>,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>,
	nios2-dev@...ts.rocketboards.org, linux <linux@...ts.openrisc.net>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>
Subject: Re: [PATCH v2 00/11] test_user_copy improvements

On Tue, Aug 11, 2015 at 6:08 AM, David Miller <davem@...emloft.net> wrote:
> From: David Miller <davem@...hat.com>
> Date: Mon, 10 Aug 2015 15:29:38 -0700 (PDT)
>
>> Also, I think the tests you added and protected with MIPS ifdefs could
>> equally be enabled on sparc64.
>
> James, as per this issue, I was thinking we could do something like this
> so that the tests don't get messy:
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index cee5f93..48d20c8 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1922,6 +1922,7 @@ config CPU_MIPSR6
>
>  config EVA
>         bool
> +       select ARCH_SPLIT_VA_SPACE
>
>  config XPA
>         bool
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index 56442d2..4001d04 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -80,6 +80,7 @@ config SPARC64
>         select NO_BOOTMEM
>         select HAVE_ARCH_AUDITSYSCALL
>         select ARCH_SUPPORTS_ATOMIC_RMW
> +       select ARCH_SPLIT_VA_SPACE
>
>  config ARCH_DEFCONFIG
>         string
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 3a2ef67..149eb29 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -62,6 +62,9 @@ config ARCH_USE_CMPXCHG_LOCKREF
>  config ARCH_HAS_FAST_MULTIPLIER
>         bool
>
> +config ARCH_SPLIT_VA_SPACE
> +       def_bool n
> +
>  config CRC_CCITT
>         tristate "CRC-CCITT functions"
>         help

I think this applies to a few more architectures.

M68k already has a config symbol for his (CPU_HAS_ADDRESS_SPACES),
which is set by classic m68k (not Coldfire) that has the "moves" instruction.

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
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