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SubjectRe: [PATCH 0/3] powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
Naveen N. Rao's on September 6, 2019 4:20 am:
> Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR for more robust stack unwinding
> when function graph tracer is in use. Convert powerpc show_stack() to
> use ftrace_graph_ret_addr() for better stack unwinding.

This series improved my case of a WARN_ON triggering in
trace_graph_return, the last return_to_handler entry in the stack
dump has the caller in parenthesis rather than return_to_handler.

It gives the caller, it would be nice if it could output the actual
function being traced, and then continue the caller. But at least
this is a significant improvement. Thanks for the quick turnaround.

Tested-by: Nicholas Piggin <>

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