[PATCH 0/4] libtracefs: More updates to tracefs_function_filter()

[Steven Rostedt <rostedt@goodmis.org>]

Allow filter to be NULL when RESET flag is set, or to commit
an already opened filter.

Also add a "FUTURE" flag to match modules that have yet to be loaded.
Starting in Linux v4.13, module functions can be added to the filter
file before the module is loaded (and does not have any matching
function). If the FUTURE flag is set, it will write the filter
directly, and this only works for globs or direct function names.

This patch set is based on top of:

 https://patchwork.kernel.org/project/linux-trace-devel/list/?series=457711
 https://lore.kernel.org/linux-trace-devel/20210330005247.397966909@goodmis.org/


Steven Rostedt (VMware) (4):
      libtracefs: Only allow RESET flag if file is not already opened
      libtracefs: Allow filter be NULL if RESET flag is set
      libtracefs: Allow filter to be NULL if module is set in tracefs_function_filter()
      libtracefs: Add TRACEFS_FL_FUTURE flag for future module filtering

----
 Documentation/libtracefs-function-filter.txt | 52 +++++++++++++----
 include/tracefs.h                            |  3 +
 src/tracefs-tools.c                          | 83 ++++++++++++++++++++++++----
 3 files changed, 114 insertions(+), 24 deletions(-)