linux-kernel - [tip: sched/fifo] sched,acpi_pad: Convert to sched_set

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Message-ID: <159557963028.4006.12754769388857924864.tip-bot2@tip-bot2>
Date:   Fri, 24 Jul 2020 08:33:50 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     rafael.j.wysocki@...el.com,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/fifo] sched,acpi_pad: Convert to sched_set_fifo*()

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

Commit-ID:     4ca6c1a060943161c6c2ce09e02ed58a69669cfe
Gitweb:        https://git.kernel.org/tip/4ca6c1a060943161c6c2ce09e02ed58a69669cfe
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 21 Apr 2020 12:09:13 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 15 Jun 2020 14:10:20 +02:00

sched,acpi_pad: 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.

In this case, use fifo_low, because it only cares about being above
SCHED_NORMAL. Effectively no change in behaviour.

XXX: this driver is still complete crap; why isn't it using proper
idle injection or at the very least play_idle() ?

Cc: rafael.j.wysocki@...el.com
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/acpi/acpi_pad.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index e7dc013..0ad9f20 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -136,12 +136,11 @@ static unsigned int idle_pct = 5; /* percentage */
 static unsigned int round_robin_time = 1; /* second */
 static int power_saving_thread(void *data)
 {
-	struct sched_param param = {.sched_priority = 1};
 	int do_sleep;
 	unsigned int tsk_index = (unsigned long)data;
 	u64 last_jiffies = 0;
 
-	sched_setscheduler(current, SCHED_RR, &param);
+	sched_set_fifo_low(current);
 
 	while (!kthread_should_stop()) {
 		unsigned long expire_time;