linux-kernel - Re: [microblaze-linux] [RESEND PATCH] microblaze: Fix clone syscall

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Message-Id: <20130726160853.81f244ba08368e8cecab0c3b@linux-foundation.org>
Date:	Fri, 26 Jul 2013 16:08:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	monstr@...str.eu
Cc:	Rich Felker <dalias@...ifal.cx>,
	Michal Simek <michal.simek@...inx.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	James Hogan <james.hogan@...tec.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	dholsgrove@...inx.com, Al Viro <viro@...IV.linux.org.uk>,
	microblaze-uclinux@...e.uq.edu.au,
	Thomas Gleixner <tglx@...utronix.de>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [microblaze-linux] [RESEND PATCH] microblaze: Fix clone syscall

On Wed, 24 Jul 2013 08:48:27 +0200 Michal Simek <monstr@...str.eu> wrote:

> On 07/24/2013 07:55 AM, Rich Felker wrote:
> > On Wed, Jul 24, 2013 at 07:34:07AM +0200, Michal Simek wrote:
> >> Microblaze was assign to CLONE_BACKWARDS type where
> >> parent tid was passed via 3rd argument.
> >> Microblaze glibc is using 4th argument for it.
> >>
> >> Create new CLONE_BACKWARDS3 type where stack_size is passed
> >> via 3rd argument, parent thread id pointer via 4th,
> >> child thread id pointer via 5th and tls value as 6th
> >> argument
> > 
> > I believe this also affects us in musl. What is the motivation for
> > making a configure option that results in there being two incompatible
> > syscall ABIs for the same arch?
> > This sounds like a really bad idea...
> 
> This patch fixes bug which was introduced by Al's patch where he moved
> clone implementation from microblaze folder to generic location.

That's important information which was omitted from the changelog. 

Please identify the patch which casused this regression (SHA hash and
title), thanks.

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