From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: jfaslist <jfaslist@yahoo.fr>
Cc: linuxppc64-dev@ozlabs.org
Subject: Re: Maple freezing on PCI Target-Abort
Date: Thu, 04 May 2006 09:05:55 +1000 [thread overview]
Message-ID: <1146697555.6652.85.camel@localhost.localdomain> (raw)
In-Reply-To: <4458C89B.9070505@yahoo.fr>
> Setting the CPC925 according to item 3, fixes the problem. I give this
> for the record, since the fix should be in PIBS, I think.
> I still don't like the fact that a user process causing the condition
> causes the system to enter the "mon" debugger rather than being killed
> w/ SIGBUS/SIGSEGV. I guess the correct way for a fix would be to write a
> Maple specific machine_check exception?
Wasn't that fixed ? The current kernel will send a SIGBUS to userland.
The problem however is that in some cases, MC can be asynchronous in
which case I suppose it's possible that userland triggers a condition
that will cause a machine check later on in kernel mode. In any way,
userland direct mapping of MMIO is a root only facility...
Ben.
prev parent reply other threads:[~2006-05-03 23:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <43E23B4A.4020402@yahoo.fr>
[not found] ` <1138930958.4934.102.camel@localhost.localdomain>
[not found] ` <43E37DAC.4030606@yahoo.fr>
[not found] ` <1139011975.8543.4.camel@localhost.localdomain>
2006-05-03 15:13 ` Maple freezing on PCI Target-Abort jfaslist
2006-05-03 15:40 ` Segher Boessenkool
2006-05-03 23:05 ` Benjamin Herrenschmidt [this message]
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