From 0093bc3cd17c2f657682258fae73737655b8a573 Mon Sep 17 00:00:00 2001
From: Vladimir Kondratyev <wulf@FreeBSD.org>
Date: Tue, 17 May 2022 15:10:20 +0300
Subject: [PATCH] LinuxKPI: Implement sched_set_fifo(_low) functions

Required by:	drm-kmod

MFC after:	1 week
Reviewed by:	hselasky, manu
Differential Revision:	https://reviews.freebsd.org/D35050
---
 .../linuxkpi/common/include/linux/sched.h     | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/sched.h b/sys/compat/linuxkpi/common/include/linux/sched.h
index e57aec4d962..cb0ffde04b2 100644
--- a/sys/compat/linuxkpi/common/include/linux/sched.h
+++ b/sys/compat/linuxkpi/common/include/linux/sched.h
@@ -34,6 +34,7 @@
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/proc.h>
+#include <sys/rtprio.h>
 #include <sys/sched.h>
 #include <sys/sleepqueue.h>
 #include <sys/time.h>
@@ -217,4 +218,24 @@ get_task_comm(char *buf, struct task_struct *task)
 	return (task->comm);
 }
 
+static inline void
+sched_set_fifo(struct task_struct *t)
+{
+	struct rtprio rtp;
+
+	rtp.prio = (RTP_PRIO_MIN + RTP_PRIO_MAX) / 2;
+	rtp.type = RTP_PRIO_FIFO;
+	rtp_to_pri(&rtp, t->task_thread);
+}
+
+static inline void
+sched_set_fifo_low(struct task_struct *t)
+{
+	struct rtprio rtp;
+
+	rtp.prio = RTP_PRIO_MAX;	/* lowest priority */
+	rtp.type = RTP_PRIO_FIFO;
+	rtp_to_pri(&rtp, t->task_thread);
+}
+
 #endif	/* _LINUXKPI_LINUX_SCHED_H_ */