[tip: sched/fifo] sched,crypto: Convert to sched_set_fifo*()

["tip-bot2 for Peter Zijlstra" <tip-bot2@xxxxxxxxxxxxx>]

The following commit has been merged into the sched/fifo branch of tip:

Commit-ID:     dbc6d0d5a5467adb6ea5fb25844e471c7bf8fabf
Gitweb:        https://git.kernel.org/tip/dbc6d0d5a5467adb6ea5fb25844e471c7bf8fabf
Author:        Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate:    Tue, 21 Apr 2020 12:09:13 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 15 Jun 2020 14:10:20 +02:00

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.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
 crypto/crypto_engine.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index 3655d9d..198a8eb 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -482,7 +482,6 @@ struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
 						       int (*cbk_do_batch)(struct crypto_engine *engine),
 						       bool rt, int qlen)
 {
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
 	struct crypto_engine *engine;
 
 	if (!dev)
@@ -520,7 +519,7 @@ struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
 
 	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;