linux-kernel - [patch 20/50] locking/rtmutex: Prevent future include recursion hell

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Date:   Tue, 13 Jul 2021 17:11:14 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: [patch 20/50] locking/rtmutex: Prevent future include recursion hell

From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

rtmutex only needs raw_spinlock_t, but it includes spinlock_types.h which
is not a problem on an non RT enabled kernel.

RT kernels substitute regular spinlocks with 'sleeping' spinlocks which
are based on rtmutexes and therefore must be able to include rtmutex.h.

Include spinlock_types_raw.h instead.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/rtmutex.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index d1672de9ca89..9c1c67f2d810 100644
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -15,7 +15,7 @@
 
 #include <linux/linkage.h>
 #include <linux/rbtree.h>
-#include <linux/spinlock_types.h>
+#include <linux/spinlock_types_raw.h>
 
 extern int max_lock_depth; /* for sysctl */