linux-kernel - Re: + futex-runtime-enable-pi-and-robust-functionality.patch added to -mm tree

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Date:	Thu, 27 Mar 2008 07:03:54 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	benh@...nel.crashing.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org,
	buytenh@...tstofly.org, mingo@...e.hu, riku.voipio@...ial.fi,
	stable@...nel.org, schwidefsky@...ibm.com
Subject: Re: + futex-runtime-enable-pi-and-robust-functionality.patch added
	to -mm tree

On Thu, 2008-03-27 at 14:48 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2008-03-27 at 14:32 +1100, Benjamin Herrenschmidt wrote:
> > > Hmm, not sure whether there is such code, but then it would be not too bad
> > > to add
> > > 
> > >    if (!p)
> > >       return -EFAULT;
> > > 
> > > to the S390 implementations which only read data and have an exception
> > > fixup.
> > 
> > I have a different problem on some embedded powerpc's where the TLB miss
> > code isn't checking for the cached pgdir pointer being NULL (which
> > happens because we are early at boot and haven't activated an mm). So we
> > end up either taking recursive faults or going into lalaland walking
> > the page tables.
> > 
> > It happens on some unreleased code, I'll verify if it happens on
> > 8xx/4xx/etc... in a minute, and will cook a patch if it does.
> 
> Ok, so everything released seems to be fine. It will use swapper_pg_dir
> which on 32 bits will do the right thing. Pfiew ! So only some stuff I'm
> still working on breaks, I'll fix it.

I try to test at least the -rc releases on 4xx as they come out, if not
a daily git update, and this never bit on 4xx for the reasons you
stated.  Glad we have similar results.

josh

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