Messages in this thread | | | Subject | RE: Latency traces I cannot interpret (sa1100, 2.6.15-rc7-rt1) | From | Daniel Walker <> | Date | Thu, 05 Jan 2006 06:30:42 -0800 |
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On Wed, 2006-01-04 at 10:28 +0100, kus Kusche Klaus wrote: > > From: Daniel Walker > > Ok, yet another patch. This one uses the correct lowlevel calls, and I > > fixed the call ordering. > > Hmm, I have no deep knowledge of ARM assembler programming, > but your patch branches to a C subroutine without setting up a > return address in the lr register. > > Hence, the return in trace_irqs_... jumps to god-knows-where, > but not back to the next instruction. > > As a wild guess, I replaced the "b trace_irqs_..." with > "bl trace_irqs_...".
Ok .
> With this change, the kernel boots fine, but the system seems to go > into an infinite loop as soon as the first usermode processes start. > Most likely, my change messes up the lr register of some surrounding > context.
That's odd. Do you have an OOPS, or is it just a silent hang?
Daniel
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