From: Brent Cook <bcook@bpointsys.com>
To: linuxppc-embedded@ozlabs.org
Subject: Re: Realtime preemption patch on PPC
Date: Fri, 11 Aug 2006 09:38:45 -0500 [thread overview]
Message-ID: <200608110938.45385.bcook@bpointsys.com> (raw)
In-Reply-To: <1155251072.5950.80.camel@localhost>
On Thursday 10 August 2006 18:04, Ben Weintraub wrote:
> Howdy,
>
> I'm wondering if anyone has had success getting Ingo Molnar's realtime
> preemption patch (the one here:
> http://people.redhat.com/mingo/realtime-preempt/ ) working on the ppc
> arch.
I have gotten them to work with MPC7448 boards, but it has hardware floating
point, so no math-emu problems.
> Anyhow, when I boot on an MPC8555 with my hack, I get an endless stream
> of:
>
> BUG: sleeping function called from invalid context init(1) at
> arch/powerpc/math-emu/math.c:226
> in_atomic():0 [00000000], irqs_disabled():1
> Call Trace:
> [A0BB3E90] [A000934C] show_stack+0x48/0x194 (unreliable)
> [A0BB3EC0] [A001B7DC] __might_sleep+0xe8/0xf4
> [A0BB3EE0] [A00136C0] do_mathemu+0x30/0x8c8
> [A0BB3F00] [A00036AC] program_check_exception+0x1ac/0x514
> [A0BB3F40] [A0002A08] ret_from_except_full+0x0/0x4c
>
> Line 226 in arch/powerpc/math-emu/math.c is part of the do_mathemu()
> function, and contains a call to get_user(), which calls
> __might_sleep(), causing this problem.
>
next prev parent reply other threads:[~2006-08-11 14:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-10 23:04 Realtime preemption patch on PPC Ben Weintraub
2006-08-11 1:38 ` Lee Revell
2006-08-11 14:38 ` Brent Cook [this message]
2006-08-11 15:54 ` Kim Phillips
2006-08-11 22:29 ` Roger Larsson
-- strict thread matches above, loose matches on Subject: below --
2006-08-11 0:55 Ben Weintraub
2005-01-04 21:26 realtime " Tim Bird
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