ftrace: Fix regression with module command in stack_trace_filter

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When doing the following command:

 # echo ":mod:kvm_intel" > /sys/kernel/tracing/stack_trace_filter

it triggered a crash.

This happened with the clean up of probes. It required all callers to the
regex function (doing ftrace filtering) to have ops->private be a pointer to
a trace_array. But for the stack tracer, that is not the case.

Allow for the ops->private to be NULL, and change the function command
callbacks to handle the trace_array pointer being NULL as well.

Fixes: d2afd57a4b ("tracing/ftrace: Allow instances to have their own function probes")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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This commit is contained in:

Steven Rostedt (VMware) 2017-06-29 10:05:45 -04:00

parent 32c1431eea

commit 0f17976568

4 changed files with 19 additions and 5 deletions

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3

kernel/trace/ftrace.c

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3

kernel/trace/trace.c

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12

kernel/trace/trace_functions.c

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6

kernel/trace/trace_stack.c

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