From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 15 Oct 2021 10:05:59 +0000 (+0200)
Subject: futex: Fix PREEMPT_RT build
X-Git-Tag: iomap-folio-5.17-old~275^2~5
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=4d38167330910ddb15b1add5b5cef835677a29fd;p=users%2Fwilly%2Flinux.git

futex: Fix PREEMPT_RT build

Mike reported that rcuwait went walk-about and is causing failures on
the PREEMPT_RT builds, restore it.

Reported-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---

diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
index 948fcf317681..040ae4277cb0 100644
--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -5,6 +5,10 @@
 #include <linux/futex.h>
 #include <linux/sched/wake_q.h>
 
+#ifdef CONFIG_PREEMPT_RT
+#include <linux/rcuwait.h>
+#endif
+
 #include <asm/futex.h>
 
 /*