From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-kernel@vger.kernel.org, mm-commits@vger.kernel.org,
buytenh@wantstofly.org, mingo@elte.hu, riku.voipio@movial.fi,
stable@kernel.org, schwidefsky@de.ibm.com
Subject: Re: + futex-runtime-enable-pi-and-robust-functionality.patch added to -mm tree
Date: Thu, 27 Mar 2008 14:32:19 +1100 [thread overview]
Message-ID: <1206588739.6926.79.camel@pasglop> (raw)
In-Reply-To: <alpine.LFD.1.00.0802161525530.7583@apollo.tec.linutronix.de>
> 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.
Cheers,
Ben.
next prev parent reply other threads:[~2008-03-27 3:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200802150149.m1F1n8Gx013909@imap1.linux-foundation.org>
2008-02-16 12:42 ` Heiko Carstens
2008-02-16 13:05 ` Thomas Gleixner
2008-02-16 13:41 ` Heiko Carstens
2008-02-16 13:48 ` Thomas Gleixner
2008-02-16 14:04 ` Heiko Carstens
2008-02-16 14:29 ` Thomas Gleixner
2008-03-27 3:32 ` Benjamin Herrenschmidt [this message]
2008-03-27 3:48 ` Benjamin Herrenschmidt
2008-03-27 12:03 ` Josh Boyer
2008-02-18 13:00 ` Andrew Morton
2008-02-18 13:10 ` Heiko Carstens
2008-02-18 13:18 ` Heiko Carstens
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