On Wed, Aug 12, 2020 at 04:59:36PM -0400, Steven Rostedt wrote: > On Wed, 12 Aug 2020 14:53:22 -0600 > dann frazier <dann.frazier@xxxxxxxxxxxxx> wrote: > > > From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx> > > > > commit 7ef282e05132d56b6f6b71e3873f317664bea78b upstream > > > > If a process has the trace_pipe open on a trace_array, the current tracer > > for that trace array should not be changed. This was original enforced by a > > global lock, but when instances were introduced, it was moved to the > > current_trace. But this structure is shared by all instances, and a > > trace_pipe is for a single instance. There's no reason that a process that > > has trace_pipe open on one instance should prevent another instance from > > changing its current tracer. Move the reference counter to the trace_array > > instead. > > > > This is marked as "Fixes" but is more of a clean up than a true fix. > > Backport if you want, but its not critical. > > > > A note to stable maintainers. I originally thought this was just a > clean up, but it was then found that it actually does fix a bug. > (See below) Now queued up, thanks! greg k-h
