Masami Hiramatsu efbbdaa22b
tracing: Show real address for trace event arguments ...
To help debugging kernel, show real address for trace event arguments
in tracefs/trace{,pipe} instead of hashed pointer value.
Since ftrace human-readable format uses vsprintf(), all %p are
translated to hash values instead of pointer address.
However, when debugging the kernel, raw address value gives a
hint when comparing with the memory mapping in the kernel.
(Those are sometimes used with crash log, which is not hashed too)
So converting %p with %px when calling trace_seq_printf().
Moreover, this is not improving the security because the tracefs
can be used only by root user and the raw address values are readable
from tracefs/percpu/cpu*/trace_pipe_raw file.
Link: https://lkml.kernel.org/r/160277370703.29307.5134475491761971203.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org >
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org >
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