From: Roger Larsson <roger.larsson@norran.net>
To: linuxppc-embedded@ozlabs.org
Subject: Re: Floating point math in kernel interrupt -- am I doing this right?
Date: Mon, 6 Feb 2006 09:41:07 +0100 [thread overview]
Message-ID: <200602060941.07567.roger.larsson@norran.net> (raw)
In-Reply-To: <200602051140.51759.jaf@lcsaudio.com>
On s=F6ndag 05 februari 2006 20.40, Jeremy Friesner wrote:
> If I disable the saving and restoring of the FPU registers=20
> entirely, they don't seem to occur at all (at least within the bounds of =
my
> testing so far -- 15+ hours).
Is this with full mix?
Then I would really suspect the save/restore code.
Saving and restoring floating point state can be very tricky.
Do try to find an example in the manual (or possibly in the kernel itself -=
=20
context switch code)
Until this works reliably there is no point in looking for other error=20
sources. You could also try to add code inside the save-resore that destro=
ys=20
all of the floating point registers to be able to spot errors.
/RogerL
prev parent reply other threads:[~2006-02-06 9:02 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-05 19:40 Floating point math in kernel interrupt -- am I doing this right? Jeremy Friesner
2006-02-06 8:41 ` Roger Larsson [this message]
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