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locking/rtmutex: Reduce <linux/rtmutex.h> header dependencies, only include <linux/rbtree_types.h>

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We have the following header dependency problem on RT:

 - <linux/rtmutex.h> needs the definition of 'struct rb_root_cached'.
 - <linux/rbtree.h> includes <linux/kernel.h>, which includes <linux/spinlock.h>

That works nicely for non-RT enabled kernels, but on RT enabled kernels
spinlocks are based on rtmutexes, which creates another circular header
dependency as <linux/spinlocks.h> will require <linux/rtmutex.h>.

Include <linux/rbtree_types.h> instead.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211303.598003167@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2021-08-15 23:28:20 +02:00 committed by Ingo Molnar
parent 089050cafa
commit e4e17af3b7
1 changed files with 1 additions and 1 deletions
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2
include/linux/rtmutex.h
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@ -15,7 +15,7 @@
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/rbtree.h>
#include <linux/rbtree_types.h>
#include <linux/spinlock_types_raw.h>
extern int max_lock_depth; /* for sysctl */