trace: skip NULL address in add_print_address #2
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If trace_printk() uses a format that is not constant, corresponding entry in __trace_printk_fmt section will set to NULL. This NULL address cause add_print_address return -1, finally, trace cmd cannot work. Just skip NULL address. Related kernel commit: 3debb0a9ddb1 (tracing: Fix trace_printk() to print when not using bprintk())
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If trace_printk() uses a format that is not constant, corresponding entry in __trace_printk_fmt section will set to NULL.
This NULL address cause add_print_address return -1, finally, trace cmd cannot work.
Just skip NULL address.
Related kernel commit:
3debb0a9ddb1 (tracing: Fix trace_printk() to print when not using bprintk())