linux-kernel - Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT

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Date:	Mon, 23 Nov 2015 10:53:02 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-nvdimm@...ts.01.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT_DEVM in
 lib/Kconfig.debug

On Sat, Nov 21, 2015 at 07:57:02PM -0800, Dan Williams wrote:
> Let all the archs that implement CONFIG_STRICT_DEVM use a common
> definition in lib/Kconfig.debug.
> 
> Note, the 'depends on !SPARC' is due to sparc not implementing
> devmem_is_allowed().
> 
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  arch/arm/Kconfig.debug       |   14 --------------
>  arch/arm64/Kconfig.debug     |   14 --------------
>  arch/powerpc/Kconfig.debug   |   12 ------------
>  arch/s390/Kconfig.debug      |   12 ------------
>  arch/tile/Kconfig            |    3 ---
>  arch/unicore32/Kconfig.debug |   14 --------------
>  arch/x86/Kconfig.debug       |   17 -----------------
>  lib/Kconfig.debug            |   19 +++++++++++++++++++
>  8 files changed, 19 insertions(+), 86 deletions(-)

For s390

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>

> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 8c15b29d5adc..ad85145d0047 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1853,3 +1853,22 @@ source "samples/Kconfig"
> 
>  source "lib/Kconfig.kgdb"
> 
> +config STRICT_DEVMEM
> +	bool "Filter access to /dev/mem"
> +	depends on MMU
> +	depends on !SPARC
> +	default y if TILE || PPC || S390

I wouldn't mind if you would remove s390 from this list.

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