linux-kernel - Re: 2.6.26.6-rt11: BUGs (sleeping function called from invalid context)

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Message-Id: <1226094472.31966.93.camel@lappy.programming.kicks-ass.net>
Date:	Fri, 07 Nov 2008 22:47:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.26.6-rt11: BUGs (sleeping function called from invalid
	context)

On Fri, 2008-11-07 at 13:35 -0800, Fernando Lopez-Lezcano wrote:
> On Fri, 2008-11-07 at 20:16 +0100, Peter Zijlstra wrote:
> > On Fri, 2008-11-07 at 14:01 -0500, Steven Rostedt wrote:
> > > Peter, I think we've seen this before. It is the highmem code sleeping.
> > 
> > I've been working on an alternative kmap_atomic implementation for -rt,
> > the below has been build and booted but not stressed, anybody care to
> > give it a spin ?
> 
> I'll give it a try. Anything in particular I should try to do? Or not
> do? Or watch for?

Lots of I/O should stress the i386 highmem stuff. If all is well it
works, if not, crashes and splats.

> -- Fernando
> 
> 
> > ---
> >  arch/x86/mm/highmem_32.c  |  130 ++++++++++++++++++++++++++++++++++++++++++---
> >  include/asm-x86/highmem.h |   11 ----
> >  include/linux/sched.h     |    5 ++
> >  kernel/sched.c            |   10 ++++
> >  4 files changed, 137 insertions(+), 19 deletions(-)
> >  [MUNCH]
> 
> 

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