tree bbc6601cee69d7ed8f107022dac91e0bdda886c2
parent fbb2d72a54c6402192df22bf0c35e41f750ba188
author Tom Zanussi <tom.zanussi@linux.intel.com> 1506110297 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1514208224 +0100

tracing: Exclude 'generic fields' from histograms


[ Upstream commit a15f7fc20389a8827d5859907568b201234d4b79 ]

There are a small number of 'generic fields' (comm/COMM/cpu/CPU) that
are found by trace_find_event_field() but are only meant for
filtering.  Specifically, they unlike normal fields, they have a size
of 0 and thus wreak havoc when used as a histogram key.

Exclude these (return -EINVAL) when used as histogram keys.

Link: http://lkml.kernel.org/r/956154cbc3e8a4f0633d619b886c97f0f0edf7b4.1506105045.git.tom.zanussi@linux.intel.com

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>