sched_ext: Convert sub-cap kfuncs to __arena cmask arguments

The sub-cap kfuncs take their cmask arguments as __ign pointers. The values
cross the kfunc boundary as unchecked scalars and scx_cmask_ref_init()
rebases them into the arena by hand.

BPF now translates between BPF and kernel arena addresses for __arena
arguments. Tag the cmask arguments __arena so the kfuncs receive kernel
addresses and scx_cmask_ref_init() loses the hand-rolled conversion. The
optional denied_out keeps its NULL not-provided signal via
__arena__nullable. The mandatory masks use plain __arena.

scx_qmap's call sites drop the (void *)(long) casts since the BPF-side
declarations type the cmask arguments __arena and take arena pointers
directly.

The arena argument address translation is currently implemented only on
x86-64. Schedulers calling these kfuncs load only there for now.

Signed-off-by: Tejun Heo <tj@kernel.org>

0 files changed, 0 insertions, 0 deletions