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

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Message-ID: <20151124082757.GB23624@gmail.com>
Date:	Tue, 24 Nov 2015 09:27:57 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	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" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT_DEVM in
 lib/Kconfig.debug


* Kees Cook <keescook@...omium.org> wrote:

> On Mon, Nov 23, 2015 at 9:12 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> > On Mon, Nov 23, 2015 at 12:12 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >>
> >> * Dan Williams <dan.j.williams@...el.com> wrote:
> >>
> >>> Let all the archs that implement CONFIG_STRICT_DEVM use a common
> >>> definition in lib/Kconfig.debug.
> >>
> >> For the x86 bit:
> >>
> >> Acked-by: Ingo Molnar <mingo@...nel.org>
> >>
> >>> Note, the 'depends on !SPARC' is due to sparc not implementing
> >>> devmem_is_allowed().
> >>
> >> Maybe that should be converted into a helper Kconfig switch for architectures to
> >> opt in to /dev/mem restrictions?
> >
> > Sure, easy enough to add a ARCH_HAS_DEVMEM_IS_ALLOWED opt-in.
> 
> Is there some hidden meaning about the difference between ARCH_HAS_...
> and HAVE_ARCH_... and HAVE_... ?

There's also the double underscore variants such as __HAVE_ARCH_STRNCASECMP! ;-)

It's all just nonsensical historic muck: because no-one ever was confronted with 
the messy global picture.

Today you can run Documentation/features/list-arch.sh and wonder at the zoo of 
options ;-)

Thanks,

	Ingo
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