linux-kernel - Re: Remove execution domain support

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Message-ID: <1428794717.18187.174.camel@kernel.crashing.org>
Date:	Sun, 12 Apr 2015 09:25:17 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Richard Weinberger <richard@....at>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Vineet Gupta <vgupta@...opsys.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, hskinnemoen@...il.com,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Miao Steven <realmz6@...il.com>,
	Mark Salter <msalter@...hat.com>,
	"JACQUIOT-XID, Aurelien" <a-jacquiot@...com>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	David Howells <dhowells@...hat.com>,
	Richard Kuo <rkuo@...eaurora.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	James Hogan <james.hogan@...tec.com>,
	Michal Simek <monstr@...str.eu>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ley Foon Tan <lftan@...era.com>,
	Jonas Bonn <jonas@...thpole.se>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	liqin.linux@...il.com, Lennox Wu <lennox.wu@...il.com>,
	David Miller <davem@...emloft.net>, cmetcalf@...hip.com,
	Jeff Dike <jdike@...toit.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: Remove execution domain support

On Sat, 2015-04-11 at 23:12 +0200, Richard Weinberger wrote:
> Am 11.04.2015 um 22:52 schrieb Linus Torvalds:
> > On Sat, Apr 11, 2015 at 1:47 PM, Richard Weinberger <richard@....at> wrote:
> >>
> >> The removal will make architecutre specific signal handling easier
> >> and there is no need to keep execuction domains as this feature is
> >> obviously incomplete and abandoned
> > 
> > Ack. The whole exec domain made some code code pretty inscrutable.
> > 
> > So I'd certainly be willing to pull this during the 4.1 merge window
> > if nobody complains.
> > 
> > Anybody?
> 
> It would be great to have an Ack from sparc folks.
> I had to recalculate the values of their TI_* constants
> and I don't have a sparc box to test it.

That's what qemu is for :-)

> Using asm-offsets.c for that seems to be impossible on sparc
> as sparc's asm-offsets.c depends on sched.h which depends again
> on thread_info.h...
> Resolving this circular dependency without the ability to run-time
> test my changes was too risky for me.
> 
> Thanks,
> //richard
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