arm64 function_graph tracer panic with CONFIG_DYNAMIC_FTRACE
Lorenzo Pieralisi
lorenzo.pieralisi at arm.com
Mon Nov 16 07:48:22 PST 2015
On Mon, Nov 16, 2015 at 01:45:19PM +0000, Catalin Marinas wrote:
[...]
> > There are some other functions which are called by cpu_suspend(), e.g. psci_system_suspend().
> > Should we apply a similar fix to them?
>
> I think we need to apply the fix to any function which does not return.
> In general, this should apply to all finishers passed to cpu_suspend()
> and the subsequent callees.
Yes, I prefer Steven's suggestion though it seems to me the issue
is only related to the graph tracer and by pausing/resuming tracing
across cpu_suspend() we would solve the problem without having to
patch the finishers (and we can still trace them with the function
tracer).
Takahiro, do you want me to send a patch or you update yours ?
> Do we need such annotation for cpu_die() as well? It probably doesn't
> matter as the CPU is coming back on a completely different path anyway.
I will test this too in the process.
Thanks for debugging this,
Lorenzo
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