linux-kernel - [PATCH 03/23] sched,crypto: Convert to sched_set

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Date:   Wed, 22 Apr 2020 13:27:22 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, rostedt@...dmis.org, qais.yousef@....com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, bsegall@...gle.com, mgorman@...e.de,
        peterz@...radead.org, herbert@...dor.apana.org.au
Subject: [PATCH 03/23] sched,crypto: Convert to sched_set_fifo*()

Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

Use sched_set_fifo() to request SCHED_FIFO and delegate
actual priority selection to userspace. Effectively no change in
behaviour.

Cc: herbert@...dor.apana.org.au
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
---
 crypto/crypto_engine.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -396,7 +396,6 @@ EXPORT_SYMBOL_GPL(crypto_engine_stop);
  */
 struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
 {
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
 	struct crypto_engine *engine;
 
 	if (!dev)
@@ -428,7 +427,7 @@ struct crypto_engine *crypto_engine_allo
 
 	if (engine->rt) {
 		dev_info(dev, "will run requests pump with realtime priority\n");
-		sched_setscheduler(engine->kworker->task, SCHED_FIFO, &param);
+		sched_set_fifo(engine->kworker->task);
 	}
 
 	return engine;