linux-kernel - Re: mmotm 2018-09-12-16-40 uploaded (psi)

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Message-ID: <20180913014222.GA2370@cmpxchg.org>
Date:   Wed, 12 Sep 2018 21:42:22 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     akpm@...ux-foundation.org, broonie@...nel.org, mhocko@...e.cz,
        sfr@...b.auug.org.au, linux-next@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org
Subject: Re: mmotm 2018-09-12-16-40 uploaded (psi)

Hi Randy,

Thanks for the report.

On Wed, Sep 12, 2018 at 05:45:08PM -0700, Randy Dunlap wrote:
> Multiple build errors when CONFIG_SMP is not set: (this is on i386 fwiw)
> 
> in the psi (pressure) patches, I guess:
> 
> In file included from ../kernel/sched/sched.h:1367:0,
>                  from ../kernel/sched/core.c:8:
> ../kernel/sched/stats.h: In function 'psi_task_tick':
> ../kernel/sched/stats.h:135:33: error: 'struct rq' has no member named 'cpu'
>    psi_memstall_tick(rq->curr, rq->cpu);

This needs to use the SMP/UP config-aware accessor.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---

diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 2e07d8f59b3e..4904c4677000 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -132,7 +132,7 @@ static inline void psi_task_tick(struct rq *rq)
 		return;
 
 	if (unlikely(rq->curr->flags & PF_MEMSTALL))
-		psi_memstall_tick(rq->curr, rq->cpu);
+		psi_memstall_tick(rq->curr, cpu_of(rq));
 }
 #else /* CONFIG_PSI */
 static inline void psi_enqueue(struct task_struct *p, bool wakeup) {}