From c63b106760cc99aa857caa104a2d24cd3753e161 Mon Sep 17 00:00:00 2001
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 9 Jan 2024 20:55:58 -0500
Subject: [PATCH] Fix: Include linux/sched/rt.h for kernels v3.9 to v3.14

From kernel v3.0 to v3.8, MAX_RT_PRIO is defined in linux/sched.h.

From kernel v3.9 to v3.14, MAX_RT_PRIO is defined in linux/sched/rt.h,
which is not included by linux/sched.h (hence this work-around).

From kernel v3.15 onwards, MAX_RT_PRIO is defined in linux/sched/prio.h,
which is included by linux/sched.h.

Add the missing linux/sched/rt.h include for the affected kernel version
range.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ie7e1d9dc710621deca04553a9b5ba7f9a4d83c15
---
 src/lttng-context-prio.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/lttng-context-prio.c b/src/lttng-context-prio.c
index cbe94800..8cb025cd 100644
--- a/src/lttng-context-prio.c
+++ b/src/lttng-context-prio.c
@@ -15,6 +15,18 @@
 #include <ringbuffer/frontend_types.h>
 #include <wrapper/vmalloc.h>
 #include <lttng/tracer.h>
+#include <lttng/kernel-version.h>
+
+/*
+ * From kernel v3.0 to v3.8, MAX_RT_PRIO is defined in linux/sched.h.
+ * From kernel v3.9 to v3.14, MAX_RT_PRIO is defined in linux/sched/rt.h,
+ * which is not included by linux/sched.h (hence this work-around).
+ * From kernel v3.15 onwards, MAX_RT_PRIO is defined in linux/sched/prio.h,
+ * which is included by linux/sched.h.
+ */
+#if LTTNG_KERNEL_RANGE(3,9,0, 3,15,0)
+# include <linux/sched/rt.h>
+#endif
 
 /*
  * task_prio() has been implemented as p->prio - MAX_RT_PRIO since at
-- 
2.34.1