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089050cafa
So we have this 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>. Split out the type definitions and move them into their own header file so the rtmutex header can include just those. 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/20210815211303.542123501@linutronix.de
34 lines
946 B
C
34 lines
946 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _LINUX_RBTREE_TYPES_H
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#define _LINUX_RBTREE_TYPES_H
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struct rb_node {
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unsigned long __rb_parent_color;
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struct rb_node *rb_right;
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struct rb_node *rb_left;
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} __attribute__((aligned(sizeof(long))));
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/* The alignment might seem pointless, but allegedly CRIS needs it */
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struct rb_root {
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struct rb_node *rb_node;
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};
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/*
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* Leftmost-cached rbtrees.
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*
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* We do not cache the rightmost node based on footprint
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* size vs number of potential users that could benefit
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* from O(1) rb_last(). Just not worth it, users that want
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* this feature can always implement the logic explicitly.
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* Furthermore, users that want to cache both pointers may
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* find it a bit asymmetric, but that's ok.
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*/
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struct rb_root_cached {
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struct rb_root rb_root;
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struct rb_node *rb_leftmost;
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};
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#define RB_ROOT (struct rb_root) { NULL, }
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#define RB_ROOT_CACHED (struct rb_root_cached) { {NULL, }, NULL }
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#endif
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