• Steven Rostedt (VMware)'s avatar
    ftrace: Fix regression with module command in stack_trace_filter · 0f179765
    Steven Rostedt (VMware) authored
    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: d2afd57a ("tracing/ftrace: Allow instances to have their own function probes")
    Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
    0f179765
trace_stack.c 11.1 KB