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tracing: Add simple expression support to hist triggers
Add support for simple addition, subtraction, and unary expressions (-(expr) and expr, where expr = b-a, a+b, a+b+c) to hist triggers, in order to support a minimal set of useful inter-event calculations. These operations are needed for calculating latencies between events (timestamp1-timestamp0) and for combined latencies (latencies over 3 or more events). In the process, factor out some common code from key and value parsing. Link: http://lkml.kernel.org/r/9a9308ead4fe32a433d9c7e95921fb798394f6b2.1516069914.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> [kbuild test robot fix, add static to parse_atom()] Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> [ Replaced '//' comments with normal /* */ comments ] Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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