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

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Message-Id: <1206589719.6926.81.camel@pasglop>
Date:	Thu, 27 Mar 2008 14:48:39 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	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 14:32 +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.

Cheers,
Ben.


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