vm_pageout_scan_active: ensure ps_delta is initialized

[vangyzen]

Summary

Ensure ps_delta is initialized.

Reported by: Coverity

[markj]

sys/vm/vm_pageout.c

1293 ↗

(On Diff #76283)

I guess this is the only case where we can end up with a bogus ps_delta. It should be quite rare.

The assignment should go here, not at the top of the loop. We only break from the loop when the atomic_fcmpset at the end succeeds. In one iteration we might set ps_delta to a nonzero value, fail the update, and then exit the loop through this case, in which case ps_delta will be left equal to the old and now-incorrect value.

[vangyzen]

• move init to the right place

[vangyzen]

sys/vm/vm_pageout.c

1293 ↗

(On Diff #76283)

Indeed. Thank you.