This is a note to let you know that I've just added the patch titled

tracing: Exclude 'generic fields' from histograms

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: tracing-exclude-generic-fields-from-histograms.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Dec 20 18:17:52 CET 2017

From: Tom Zanussi tom.zanussi@linux.intel.com Date: Fri, 22 Sep 2017 14:58:17 -0500 Subject: tracing: Exclude 'generic fields' from histograms

From: Tom Zanussi tom.zanussi@linux.intel.com

[ 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...

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 --- kernel/trace/trace_events_hist.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -450,7 +450,7 @@ static int create_val_field(struct hist_ }

field = trace_find_event_field(file->event_call, field_name); - if (!field) { + if (!field || !field->size) { ret = -EINVAL; goto out; } @@ -548,7 +548,7 @@ static int create_key_field(struct hist_ }

field = trace_find_event_field(file->event_call, field_name); - if (!field) { + if (!field || !field->size) { ret = -EINVAL; goto out; }

Patches currently in stable-queue which might be from tom.zanussi@linux.intel.com are

queue-4.14/tracing-exclude-generic-fields-from-histograms.patch