RFC jump label: introduce default true branch

Hi Peter,

I've introduced a new static_branch_def_true() construct, such that the straight line path is the true branch, and we patch a jump to get to the false branch. In order to make jump_label_inc()/dec() work as 'make true'/'make false' with counting, I've had to update some of the core jump label code. This patchset also
introduces: JUMP_LABEL_INIT_TRUE/FALSE, so that keys should be initialized as:

struct jump_label_key true_key = JUMP_LABEL_INIT_TRUE;

or

struct jump_label_key false_key = JUMP_LABEL_INIT_FALSE;

I think this patch series should address the issues that came up with sched_feat() implementation.

Thanks,

-Jason

Jason Baron (4):
jump label: Introduce default true branch + API update
perf: Make use of updated jump label API.
tracepoints: update to use new jump label API.
sched: Make use of new jump label API.

 include/linux/jump_label.h |   77 ++++++++++++++++++++++++++++++++++++-------
 include/linux/perf_event.h |    6 ++--
 include/linux/tracepoint.h |    4 +-
 kernel/jump_label.c        |   66 +++++++++++++++++++++++++------------
 kernel/sched/core.c        |   12 +++---
 kernel/sched/fair.c        |    2 +-
 kernel/sched/sched.h       |   11 +------
 kernel/tracepoint.c        |   12 +++---
 8 files changed, 128 insertions(+), 62 deletions(-)

1.7.7.3