sched: Replace nr_iowait_cpu() with a bool accessor

The menu governor was the last consumer of the per-CPU I/O-wait count
that needed its magnitude, apart from nr_iowait() summing it globally.
Commit 38f83090f515 ("cpuidle: menu: Remove iowait influence") removed
that use. All remaining per-CPU consumers only test for zero/nonzero.

Replace nr_iowait_cpu() with bool cpu_has_iowait() and update the generic
and s390 idle accounting callers. Have nr_iowait() read the counters
directly so that the global total and existing accounting are preserved.
Replace the stale menu comment with a description of the predicate.
Also convert the remaining open-coded idle accounting checks to use the
predicate, as suggested by Prateek.

The conversion was done with coccinelle:

@ predicate depends on patch @
expression cpu;
@@

- nr_iowait_cpu(cpu) > 0
+ cpu_has_iowait(cpu)

@ callers depends on patch @
expression cpu;
@@

- nr_iowait_cpu(cpu)
+ cpu_has_iowait(cpu)

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kayra Cizmeci <kayracizmeci@gmail.com>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/20261016073341.575472-1-christian.loehle@arm.com

0 files changed, 0 insertions, 0 deletions