Re: [PATCH v7 01/15] sched/core: uclamp: Add CPU's clamp buckets refcounting

On Thu, Mar 14, 2019 at 11:03:30AM +0000, Patrick Bellasi wrote:

void uclamp_rq_dec_id(struct rq *rq, int clamp_id, int bucket_id) {
    if (__builtin_expect(!!(rq->uclamp[clamp_id].bucket[bucket_id].tasks), 1))
        return;
    rq->uclamp[clamp_id].bucket[bucket_id].tasks--;
}
---8<---

generates something like:

---8<---
uclamp_rq_dec_id:
        sxtw    x1, w1
        add     x3, x1, x1, lsl 1
        lsl     x3, x3, 2
        sub     x3, x3, x1
        lsl     x3, x3, 2
        add     x2, x3, x2, sxtw 3
        add     x0, x0, x2
        ldr     w1, [x0, 8]
        cbz     w1, .L4
        ret
.L4:
        mov     w1, -1
        str     w1, [x0, 8]
        ret
---8<---


which looks "sane" and quite expected, isn't it?

Yep, thanks! Sometimes I worry about silly things.