tree 5d84dd8378da3eb444ec918d94ecd2219a7a5f76
parent 64ec8dc15c14d305295b64cdfcc6b2b9dd14753f
author Tom Zanussi <tom.zanussi@linux.intel.com> 1541543746 -0600
committer Tom Zanussi <tom.zanussi@linux.intel.com> 1555443140 -0500

tracing: Check keys for variable references in expressions too

There's an existing check for variable references in keys, but it
doesn't go far enough.  It checks whether a key field is a variable
reference but doesn't check whether it's an expression containing
variable references, which can cause the same problems for callers.

Use the existing field_has_hist_vars() function rather than a direct
top-level flag check to catch all possible variable references.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Reported-by: Vincent Bernat <vincent@bernat.ch>